My Straight shooter thread
http://castboolits.gunloads.com/show...traightshooter
My Straight shooter thread
http://castboolits.gunloads.com/show...traightshooter
Ran 14 rounds through the chrono. Same 15 grain powder load of W296 but varied COAL with the Lee 312-155 cast boolit. Ran great and bolt locked open on last round. One round didn't cycle the action but this is not my battle gun and it is brand new so either way I'm not concerned. All fired, no fliers and an average of 1800fps. Very happy with the start. Barrel looks clean.
Just starting with a 155gr casting and 15gr W296/H110 is 1800fps. Perfect cycling and great accuracy. I have yet to read anyone having much success with the 309-150 bullet in an AR. I'm using the Lee 312-155-2R with copper gas checks applied in a Lee .309 sizer. From a load standpoint 150gr is going to be very similar but the shape of the Lee 309-150 might be a pain in an AR. The 312-155-2R on the other hand works great in an AR loaded to a length of about 2.010-2.015. That's where the crimp groove is. That is going to be THE cast bullet in 300AAC for me. The flat base mil-spec M2 copper FMJ is my other 300AAC projectile. I'm only shooting supers, no subs.
Has anyone worked up a load for the Lee C312-185-1R sized down to 309 for sub-sonic shooting.
Moonie, I really did not put enough information in my original post. I will be shooting from a AR platform. I have not bought the upper yet. I am looking at a 16 inch barrel with a carbine length gas system. I might have to go to a pistol length gas system to get the gas pressure to cycle the action. still lots of reading and questions to ask else where. I was hoping for some experience from others who have gone before me to keep me from duplicating the same mistakes.
rwoods61
I am shooting the 312-155-2R in a 16" carbine length AR. Bullets are COWW tumbled lubed with 45/45/10. Loaded to the crimp groove and medium crimped. CCI #41 primer 15.3gr W296 and copper gas checked. About 1850fps. Cycles fine, does not always lock bolt back. May change the buffer spring.
The solution is simple. Pistol length gas systems are the answer. I shoot anything in my 300 blackout with its pistol gas system and it functions flawlessly. Want to tweek it a little? Its a simple answer adjustable gas block.
Is 20.0 gr Accurate 1680 too hot for 150 gr Powder Coat ?
We have had a couple of 16" carbine length gas and with the correct powders they cycle just fine with standard BCG, carbine buffer and spring. Powders in the 1680 range do very well for subs, RL-7 is the one I've had the best luck with for subs (200+gr). We have had good luck with 15.3gr of W296/H110 with the Lee 155gr.
I have tried several cast & jacket loads in the 147-155gr range & all cycled fine. No idea of speed cause havn't chronyed but all worked. All were loaded so ogive was a little off l&g.
Just ordered a 10.5" upper and a pistol lower in 300 BO. I believe the barrel has a carbine gas tube length.
I always shot RCBS SIL 165 gr. cast bullets when shooting SIL with my TC Contender 30 M1 Carbine. It would shoot good sub 1" 5 shot groups off sand bags at 100 yds.
Any recommended loads for the 165 gr lead hard cast in the 300 BO?
Last edited by MK111; 03-15-2017 at 05:03 PM.
16 of 1680 under a 170 PB works fine in my 10" pistol.
Whatever!
I must be the luckiest guy in the world. I have yet to find a load that didn't cycle! I've tried 7 different powders and run charges from 2 gr below recommended start up to near top. I use plain base 130 gr and 150 gr cast, powder coated. My AR is a home-built .300AAC with a carbine length gas tube. Some of the loads weren't very accurate, but they have all functioned perfectly.
Shot a bunch of 150-160GC yesterday & while all cycled fine, I had to really seat them deep to chamber them & none shot very good at 100. Best was about 4" for 5 shots. Tried several powders H110, 4227 & a couple others.
Went to 130 SPGC & 125GC which cycled & loaded fine at crimp groove. Still did not shoot any better than the others.
Jackets from 147-155 shot OK but not great 2-3". Using a red dot so putting scope on it to shoot next time.
Don't see how I can even get heavier bullets to seat.
Just not getting accuracy any where near the 223s.
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |