Powder choices for 5.56mm in a semi auto?

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RecoilRob said:
H-335 meters SO well and it's the perfect burn rate for AR's so you can't go wrong with it. If your powder measure will throw extruded types well...AR Comp seems to work really well too. Burns nice and clean and is very consistent across wide temperature variations. My Lyman powder measure just doesn't throw it as easily and consistently as it does the ball types like 335.
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What would you use as a starting load for ArComp with RMR 55gr FMJ?
 
What would you use as a starting load for ArComp with RMR 55gr FMJ?
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Well, from what I've seen the AR Comp loads are very similar to H-335 which is one of the reasons it works so well in the AR-15. They (Alliant) say 25.6 for a max with that bullet and I've had no problems loading them to that level as my rifles seem to like them warmish and I don't expect to get more than a few loadings out of the cases.

To be prudent it wouldn't hurt to drop down to 23.0 just to be safe to start and work up, though I've been fortunate and never found any recent published load to cause problems it's a good practice to be careful. That doesn't apply to an old Speer book I've got from the '70's that has some smoky hot loads in it, but anything recently will have pressure tested data and unless your rifle is very different in some way you should be fine. If you work up the load I'll be surprised if you don't end up right at the 25.6 as they shoot well in my 1:9 twist barrel.
 
For my Mini-14 with it's 18 inch barrel, I like IMR-4198, IMR-3031 and WW-748.

I don't have any experience with some of the newer powders that have come out recently due to a catastrophic disability that kept me from reloading for a couple of decades.
 
RecoilRob said:
Well, from what I've seen the AR Comp loads are very similar to H-335 which is one of the reasons it works so well in the AR-15. They (Alliant) say 25.6 for a max with that bullet and I've had no problems loading them to that level as my rifles seem to like them warmish and I don't expect to get more than a few loadings out of the cases.

To be prudent it wouldn't hurt to drop down to 23.0 just to be safe to start and work up, though I've been fortunate and never found any recent published load to cause problems it's a good practice to be careful. That doesn't apply to an old Speer book I've got from the '70's that has some smoky hot loads in it, but anything recently will have pressure tested data and unless your rifle is very different in some way you should be fine. If you work up the load I'll be surprised if you don't end up right at the 25.6 as they shoot well in my 1:9 twist barrel.
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Thank you, yes safety first. I'll use them in my M&P 15. With luck I'll pop a few across the chrony and see what it says. Working up from 23.0.
 
Personally ?

4895

I use it in many rifle loads, and I have gobs of it on hand.

I'm going to be branching out with the new Barnes m/le RRLP in .224, however.
 
I use Varget in my bolt guns,CFE223 in the AR,it also likes Varget,but my powder measure don't.
 
I use Reloder 10x for all my Ar loads. I have used Varget and H4895 and they work fine, but RL10x performs better in my ARs than anything else (and I can always find it, unlike the others.)

Now I save the Varget and H4895 for the larger rifles.
 
Test loads made up with H335 and IMR 3031, only bullets I could find were Hornday 55 gr SP, but we'll see. It did OK with generic no name 55gr ammo, so I have hope. :) Thanks to everyone who chimed in!
 
I put together a really nice load for my Ar-15: 25 grains AA-2460, SRM primer and 62 grain FMJ.

Shoots really nice and clusters them tight, shooting off-hand.

This stuff meters like water, I really like it.
 
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