AR Carbine 16 inch Load data

[reddoggm]

Picked up an AR with a 16 inch 1&7 twist Barrel Getting ready to gear up to reload for the Beast But keep finding Data for 24 inch 1&12 twist barrels Got the gun with a LB of AR Comp powder 1000 trimmed /swaged cases with 100 Sierra HP 60 grainers and 100 Sierra SP 63 grainers I was hopeing to use up what I have But can,t find any Data for the AR Comp with these Jwords
Also was wondering what you 5.56 casters use for a mold that would work well for the 16 inch 1&7 twist barrel
Any Help is MUCHO Appriciated
DOGG!!!

[DR Owl Creek]

Sorry, but I don't have any data for the Sierra 60 gr HP or 63 gr HP with AR-Comp. I do have the Alliant 2013 Reloader's Guide. It has listings for the Sierra 55 gr BTHP, the Hornady 68 gr BBTHP, and Sierra 69 gr BTHP with AR-Comp. Here are the max loads for those:

Sierra 55 gr BTHP, @ 2.240" OAL, Fed 205 primer, 25.6 gr AR-Comp, @ 3359 fps
Hornady 68 gr BTHP, @2.250" OAL, Fed 205 primer, 23.4 gr AR-Comp, @ 2969 fps
Sierra 69 gr BTHP, 2.260" OAL, Fed 205 primer, 23.2 gr AR-Comp, @ 2969 fps

Hope that helps get you in the ball park for your loads.

For a good cast bullet mold for your 16" AR. Check out NOE's 225 70 GR RN-GC. Go to: http://noebulletmolds.com/NV/product_info.php?cPath=24&products_id=373&osCsid=3ueeot07edhnd13tur85va8q85

Dave

[Garyshome]

55 gr is for a 1 in 8 or 9 twist. A 1 in 7 twist is supposed to have a heavier boolit like a 70 to 77gr or something around that weight.
Article on 223/556 twist rate stuff: http://www.gunsandammo.com/ammo/pair-barrel-twist-rates-ammo/undefined

[Garyshome]

Link for 223 mold: http://castboolits.gunloads.com/showthread.php?249660-22-Lee-Mold

[Jupiter7]

Actually the 1/7 twist was made to stabilize the 62grn tracer. The 1/7 twist will shoot LC m193 sub moa in certain guns. I've yet to have one that shot worse than 1.5moa, most around 1moa.

[petroid]

my 1:7 shoots everything great down to 50 grainers. It shoots the 62gr tracers and 70gr TSX and even 90gr AMax. To the OP. Work up a load starting 15% lower than the 68gr load data from Alliant and max depending on what the rifle tells you. I definitely wouldn't go above their 55gr data unless you have a very generous throat.

[reddoggm]

Great info Guys Got all my Goodies collected To start on Yet another Load workup I just hate to let Free stuff go to waste so I guess This will be the plan

my 1:7 shoots everything great down to 50 grainers. It shoots the 62gr tracers and 70gr TSX and even 90gr AMax. To the OP. Work up a load starting 15% lower than the 68gr load data from Alliant and max depending on what the rifle tells you. I definitely wouldn't go above their 55gr data unless you have a very generous throat.

Anyone have a preference for a favorite Mold/Weight for the 5.56
Thanks for the Input Fellas
DOGG!!!

[Motor]

Don't fall for that too fast twist BS. I've had talked to more than a few match shooters and read a few more that stated one of their most accurate loads in their 1 in 7 was a 52gr BTHP Match bullet.

My own 1 in 7 which is a parts gun with PSA 20" upper shoots 55s just fine and really likes Nosler 55gr BT. Sure it likes the heavier bullets too. That's what so nice about it. The 1 in 7 will blow apart thin skinned lite varmint bullets though like Sierra Blitz bullets. Even the 55gr ones. I use the Hornady 60gr V-Max in it for groundhogs.

Sorry I don't bother casting for anything smaller than 30 cal. It would seem to me the fast twist may be a challange for a cast bullet. I'll be watching this too see if you get any positive responces.

[ipijohn]

I am having success with 70 grn Mihec mold boolits in a 1 in 9 twist AR, cast with COWW +2% tin that are powder coated. I tried a 55 grn Lyman mold that I had but results weren't as good.

[Garyshome]

Check the sierra web site for their load data or give them a call.

[tomme boy]

I have found that 24grs of Varget has shot sub MOA in 4 AR's and two bolt guns with the 60gr hp Sierra's. The 1-7 can and will blow up any of the bullets depending on how it has been treated. The throat get ate out and the chrome starts to flake and it will eat up even a FMJ. The twist just makes it worse.