300 blackout cast bullet load data

[deepdarkwaters]

hello everyone I have been mia the last year and a half from here burnt up most of my ammo horde and getting ready to start pulling the handle again but I built a new toy over the weekend 300 bo 16" 1/8 twist I think. pistol lenth gas system got dies. jig. flare die. and a lee c312-155-2r 6 cav mold on its way. now to my problem out of the stackes of reloading manuals I own the hornady 9th is the only one that has 300 blackout data and no lead data in it I have always used lyman manuals as a guide for all my cast reloads so where is the best place to get published cast bullet load data at? and any input on the lee 155gr bullet ill be loading this is my first attempt at casting for rifles and with a good poly coat is the gas check a must for that bullet I don't know how may post and forums I have checked any I see peoples pet loads but haven't see any published data thanks for taking the time to read my post

[wlc]

I used the Hornady data for my 16" 8 twist barrel and cast with good results.

[Drew P]

I'm using that bullet in a similar setup except like 9" barrel but yeah, works great. Make sure you know how to seat them to work in the mags. I messed around with powders but for supers I'm liking 1680 and H110. Haven't worked in the subs too much yet but hope to soon. No gas checks for my trials. Many mag dumps and it runs clean and smooth, well, for an AR at least.

I'm actually converting a big lot of brass today. Lot of work even with the right tools, but it's a fun one to load for I think.

[minmax]

Lyman has an AR only manual, but then it uses Lyman molds. The first part of the manual is a good read.
Go to Johnny's Reloading Bench on YouTube for the best 300 Blackout videos.

[tsubaki]

Lyman 50th Edition has data for 160gr #311672 and 180gr #311332 using Rx7, H4198, IMR-3031, H335 and AA2230.

I've not yet decided on the 30cal boolit, so I'm no help.
Given the velocities developed, I'm considering reaming out the gas check from the mold, making it into a flat base to be powder coated.
Mine is also a 16" pistol length gas system with 1:8" twist.

Keep us posted on yours.

[deepdarkwaters]

Thanks everyone for the replys ill get a new lyman manual and check out that johnnys reloading bench on YouTube been watching alot of Elvis ammo on there after i get the 300blackout reloading hammered out then im going to look into casting for my dads m1 carbine

[firebikerd]

We're shooting that boolit powdercoated no gas check with 15.5gr of H110, col 1.970-1.975,WSR, with less than 1/2turn with LFCD die Use at your own risk works in our 16" carbine length gas and 10" pistol length gas with 1909fps 5 shot avg out of the 16" BARREL. Puts a real Smack on a 10" Gong @ 100yds and a lot of fun shooting a .02cent lead bullet!

[firebikerd]

We're shooting that boolit powdercoated no gas check with 15.5gr of H110, col 1.970-1.975,WSR, with less than 1/2turn with LFCD die Use at your own risk works in our 16" carbine length gas and 10" pistol length gas with 1909fps 5 shot avg out of the 16" BARREL. Puts a real Smack on a 10" Gong @ 100yds and a lot of fun shooting a .02cent lead bullet!

Forgot to say sized .309 after powder coat with Lee push thru sizer. Because they don't make a .30 cal 310 ??????

[bruce drake]

search button on the top right corner will get you a bunch of thread on this cartridge.

[firebikerd]

Here is another of our favorites! The old Lyman 312410 It is a flat based 130gr round nose. We powder coat it too and size it to .309 after coating it.
This shoots safely in our ARs use at your own risk. 17gr H110, wsr, col 1.950, 1/4 turn LFCD, sized .309 after coating.

Point of aim Point of impact is right there with the Lee 312-155-2r @50yds 2123fps 5 shot avg out of 16" barrel. Safe in our ARs start lower on the powder charge in yours! It's about as fun as you can have with a 300BK! about .02cents a bullet too! (Both rounds cast with wheel weight lead we got years ago)

[BUCKEYE BANDIT]

Search (Larry Gibson and M1 Carbine) when your ready,best guidance I've ever received for FREE :bigsmyl2:.
Thanks everyone for the replys ill get a new lyman manual and check out that johnnys reloading bench on YouTube been watching alot of Elvis ammo on there after i get the 300blackout reloading hammered out then im going to look into casting for my dads m1 carbine

[deepdarkwaters]

Thanks again everyone for the help ill pickup a new manual to add to the 15 i already have . After my dad ruptured a case in his 338 lapua mag (used Hornady mid range data with i think a nosler bullet of the same weight but was 3 grs over redline for that bullet in the nosler manual ) i try and stick to published data for whatever i load i just wish lee would do there own test on the bullets from there molds and not use powder companies load data

[Smk SHoe]

I picked up a reloading book just for AR's. IIRC it was published by lyman. Has load data for all the usual AR calibers and a lot of lead bullet info. Very worth the 15$

[Moonie]

I sure wouldn't use 17gr H110/W296 under this boolit, lots of people report high pressure signs in the 16gr range with that boolit. Hodgdon lists a max of 17.2gr of H110/W296 with a 150gr bullet at 52,800psi. I've found 15.3gr of H110/W296 gives 1,850fps, is accurate and cycles a couple of carbine length gas uppers we have, no pressure signs. Sized .310, gas checked and powder coated, or not powder coated.

[deepdarkwaters]

Well went to my favorite tulsa reloading shop no go on the new ar reloading handbook sold out so got it on its way from amazon but got a spare lee trimmer Guage and a quick trim die and 100 gas checks just to try out some h110 powder mini harbor freight chop saw and a sierra 8th edition manual had to burn a $50basspro gift card and thats the only way way over priced thing there i needed their reloading selection sucks now if im luck my dies jig mold and manual will be in Saturday and get this show on the road

[runfiverun]

lee doesn't even do that they just re-print data from other manuals and then leaves out the important stuff like cases, primers, & bullets.

[Naporter]

If you want .310 NOE makes a push through size die that's better than Lee's with the upside of being able to change the size by changing out a bushing. you really only need one body, then just buy whatever bushing you need in whatever size you need. The bushings are pretty cheap too. The choices are seemingly endless. They also sell neck expander plugs that fit in the Lee universal expander die and turn it into a modular Lyman M die essentially.

I'm hooked on their products. They've been well made so far that I've seen and offer options not available from the major manufacturers.

[deepdarkwaters]

Ok i worked up 9 loads with 1680 rl7 and h110 my problems started on round 2 with it not chambering all the way my col was 1.970+-5 the nose of bullet is hitting hard ramping into the chamber and on one you can see where it was engaging the riflings i loaded 10 dummy rounds up and cycled them by hand first to make sure they would chamber and they all worked but did get the dinged nose i know i can set them deeper and back off the charge weight but whats your thoughts on the nose i have read alot of people use this lee 155gr bullet with no problems but its giving me fits the gun runs fine with Remington 120gr and my 155gr amax reloads the brass on the nogo rounds was a mix of lc fed and ppu on the plus side of the 30out of the 45 that fired i didn't get any leading 193416

[deepdarkwaters]

The bullets are sized to 309 the outside of the case neck is running. 330-.333. I sized the brass with rcbs sb dies and i didn't use the lee factory crimp die the badly dinged rounds is feeding off the right side of the mag tryed a steel 5rd and a standard pmag

[BUCKEYE BANDIT]

Who's upper are you running ? .M4 Ramps ?,look for a step from extension to receiver.

[6622729]

If you do a little searching you'll discover a number of conversations that should lead you to simply decide to use the gas check. It doesn't have anything to do with the coating used, (I use 45/45/10 lube), it has everything to do with accuracy. I shoot that Lee boolit lubed with 45/45/10, copper has checked and it's crazy accurate. People generally find it isn't accurate worth a hoot without the GC.




hello everyone I have been mia the last year and a half from here burnt up most of my ammo horde and getting ready to start pulling the handle again but I built a new toy over the weekend 300 bo 16" 1/8 twist I think. pistol lenth gas system got dies. jig. flare die. and a lee c312-155-2r 6 cav mold on its way. now to my problem out of the stackes of reloading manuals I own the hornady 9th is the only one that has 300 blackout data and no lead data in it I have always used lyman manuals as a guide for all my cast reloads so where is the best place to get published cast bullet load data at? and any input on the lee 155gr bullet ill be loading this is my first attempt at casting for rifles and with a good poly coat is the gas check a must for that bullet I don't know how may post and forums I have checked any I see peoples pet loads but haven't see any published data thanks for taking the time to read my post

[deepdarkwaters]

The upper is a saa. M4 feed ramps is what it has on the website accuracy with one load of 12.5gr of h110 was about 1.5" but i was having to pogo the gun off the shooting bench so much extracting stuck rounds. I was more worried about feeding then accuracy but i got to thinking all my dummy rounds was with factory 300 brass all my reloads was with converted brass but only the lead 155gr bullets right the same mixed brass with the 155gr amax shot great

[BUCKEYE BANDIT]

Not all converted brass plays nice in the Blk-Out ,especially with oversize cast .GRUMPA has a list in here somewhere .I run that 155gr. Lee in a half a dozen rifles with NO feed issues.Something is sure smakin them in the nose.

I would look at the ramp area or maybe try another brand of magazine.
The upper is a saa. M4 feed ramps is what it has on the website accuracy with one load of 12.5gr of h110 was about 1.5" but i was having to pogo the gun off the shooting bench so much extracting stuck rounds. I was more worried about feeding then accuracy but i got to thinking all my dummy rounds was with factory 300 brass all my reloads was with converted brass but only the lead 155gr bullets right the same mixed brass with the 155gr amax shot great

[deepdarkwaters]

I think i got it figured out if you ease the bcg home the round jumps up really sharp into the chamber dinging the nose and i think i may have to sand down my case holder to set my shoulder back resized factory bo brass chambers and extracts good but i still get faint rilfing marks on the bullets with a col of 2.030 im going to play with the col to see if i can stop that or see if a lighter pc coat helps

[Moonie]

I think i got it figured out if you ease the bcg home the round jumps up really sharp into the chamber dinging the nose and i think i may have to sand down my case holder to set my shoulder back resized factory bo brass chambers and extracts good but i still get faint rilfing marks on the bullets with a col of 2.030 im going to play with the col to see if i can stop that or see if a lighter pc coat helps
A nose sizer from NOE or I've found using drop out spray will undersize boolits well for powder coating.

[popper]

Mag problem. Try gen 3 Pmags, maybe lancer.

[6622729]

I haven't had a problem but it just so happens I am using gen 3 Pmags.


Mag problem. Try gen 3 Pmags, maybe lancer.

[deepdarkwaters]

I have done everthing i can think of to do andcant get rid of the small ding in the nose thought it was ramping up and hitting the top of the chamber but come to the conclusion its hitting the feed ramp my friend tryed them in his gun and they didn't do it i been chewing on my mag with a file to see if it changes anything and it could be part of the mix im using for the bullet dont know the bn but its soft ill take a picture later of the ding its one i can live withi bet i pulled 50 rds down last night that i been playing with the col and so far the 2.030 just barely dings the nose mags haven't made a difference gen 2 gen 3 or steel factory ammo and the 155gr Hornady amax reloads i gotload fine in any mag just going to be alot of trying some thing out then thinking about it all week till i can go shoot and try something different

[Grmps]

Sometimes you can tweak the metal "fingers" at the top of your mag to point the boolits up a little higher when chambering

That boolit shoots great @ 200 yrds

Good Brass for conversion
ADI PERFECTA
Aguila PMC
A USA PS
FC PSD
GFL RA
HB RP
Hornady SSA
Hornady (nickel TAA
IK03 Tula
IMI TW
IVI TZZ
LC WCC
M193 Winchester
Norinco WIN NT
NOSLER WMA 15


Thick neck wall, bad without neck turning:

AB 556 L2A2
ATI MKE13
CBC MPA
CJ6 Norma
CJ 8 NPA
DNL PMC
FNM PMP
FRONTIER PPU
GECO RAM
Hot Shot RORG
HRTRS RWS
ICC S&B
IK03 SADU
IMI TAA
IVI SADU
KFA Wolf Brass

[marek313]

Sometimes you can tweak the metal "fingers" at the top of your mag to point the boolits up a little higher when chambering

That boolit shoots great @ 200 yrds

Good Brass for conversion
ADI PERFECTA
Aguila PMC
A USA PS
FC PSD
GFL RA
HB RP
Hornady SSA
Hornady (nickel TAA
IK03 Tula
IMI TW
IVI TZZ
LC WCC
M193 Winchester
Norinco WIN NT
NOSLER WMA 15


Thick neck wall, bad without neck turning:

AB 556 L2A2
ATI MKE13
CBC MPA
CJ6 Norma
CJ 8 NPA
DNL PMC
FNM PMP
FRONTIER PPU
GECO RAM
Hot Shot RORG
HRTRS RWS
ICC S&B
IK03 SADU
IMI TAA
IVI SADU
KFA Wolf Brass

I saw that list too but I just had to pull about 200 rounds because they didnt chamber correctly as in too big of a neck. All GFL Fiochi brass so I wouldnt count on that list 100%. Out of the same batch PMC and RP all worked fine. I have 16" PSA upper 1/8.

Going back to the original post I would definitely consider testing with the same head stamp brass. I never had any problems with Lake City converted brass so from now on I'm just going to stick with that.
The other thing to look at would be your OAL. I'm using the same Lee 312-155-2R mold and I know I had to load this pretty short to make it cycle properly. Unfortunately I'm at work so I'll have to look at my notes when I get home to confirm.
I do remember that 15-16gr of H110 is a safe and accurate load data, at least for my gun so use it at your own risk.

[Moonie]

I saw that list too but I just had to pull about 200 rounds because they didnt chamber correctly as in too big of a neck. All GFL Fiochi brass so I wouldnt count on that list 100%. Out of the same batch PMC and RP all worked fine. I have 16" PSA upper 1/8.

Going back to the original post I would definitely consider testing with the same head stamp brass. I never had any problems with Lake City converted brass so from now on I'm just going to stick with that.
The other thing to look at would be your OAL. I'm using the same Lee 312-155-2R mold and I know I had to load this pretty short to make it cycle properly. Unfortunately I'm at work so I'll have to look at my notes when I get home to confirm.
I do remember that 15-16gr of H110 is a safe and accurate load data, at least for my gun so use it at your own risk.

16gr caused flattened primers and swipes on the brass for me, I load 15.3gr of H110/W296 with the 312-155gr Lee.

[Road_Clam]

I'm loading 1680 with either the 220 SMK or the 220 Leather Head cast for subsonic. For my supersonic i'm loading 155 Nosler CC's and 4198. I have a 16" upper running a pistol length gas system. Excellent gas system function, however I had a lot of feeding problems with the heavy 220 gr bullets. After a ton of research and trying different things I found out it was simply the mags. I ended up modifying a Magpul AR15 mag by filing the internal ribs flat. This allows the bullets to be stripped from the mags without the bullet dragging along the internal ribs.

[ricardo]

Can any one help me with load data for a 300 blackout using a 160 grain, CL bullet using Rx-7, win231 or CFE BLK powder. I need some estimates of psi with the load data? I can't seem to find any of these relationships. I need the psi estimates to use with tables that I have developed that define the variations in BHN vs Heat Treatment Temp vs time for both water quench and air cooled bullets. I have tables for COWW and COWW+2.68% tin.

[Hamish]

Lee 155 and NOE 310-196 over 15.7 Rel-7. No idea of pressure.

[Lloyd Smale]

bit of advice. Find yourself a rcbs 130 spitzer gas check mold. It feeds and shoots better then the lee 155 in both of my 300s. Plus theres tons of 130 load data out there. Im with 6622729 use the check. My groups go from minute of paper at 50 yards to inch or less just by putting on the check. IF your going to shoot them at full power with powders used for full power jacketed cast them HARD, pc them and use a gas check. That is unless your only goal is to here a bang. 17 grains of 110 a fed primer and that bullet cast at 22bhn with a check and pc coated shoots 1 1/2 for 5 shot at a 100 yards out of my 16 inch psa gun and my 8.5 shoots the same load into 2 inch at a 100. Keep in mind that that is only the second load I tried and if I kept playing I could probably get more out of it but its good enough for what I do with cast out of it.

[popper]

Pmags have a vertical rib that prevents loading very many rnds without jams. The rib does NOT extend into the mag feed area. The front of the mags have a guide that may push the nose the wrong way. The mag lips may be the wrong length. Case head must pop up from the lips and short/long seating can mess with this. Usually the nose hits on top, not on the ramps. When seated shorter than mag length, the bolt may strip off a rnd AND move the underneath one to the front of the mag. That one then doesn't feed correctly. Also check that the LOWER has feed ramp in it as well as the extension. Carefully dremel to fix it. PC is probably making the nose too big to fit. Seat 0.050" deeper usually works. If I didn't crimp, re-seating usually works.

[Lloyd Smale]

magpul, and a couple others make dedicated 300 bo mags now. No need to file on your 556 mags anymore. the pmags even have a slightly different shaped follower to help feeding with the 300. Ive seen them as cheap as 11 bucks a piece. hardly worth not using them.