55gr 223 sbr loads

[jdutton24]

Looking at several powders for 55gr fmj for a short barrel ar15. Looking at varget, H322, tac, 8208 xbr, imr4166 and good ole H4895 (new temp stable version). The barrel length is 11.5 inch so I feel like I need a fast burning powder. Really want a clean burning temp insensitive powder but proving difficult. Varget is better for heavier bullets from what i understand but only gonna shoot 55-62 gr and it's not really fast burning. My dream powder is a temp insensitive powder and gives good velocity temp insensitive, clean burning and works in 308 and 223 AR15. What y'all thinking

 

[Itzdapig]

I would look at 2230, exterminator or Re7 myself. Of those listed probably the 8208 as far as temp insensitive powders.

 

[Rule3]

Any of the Hodgdon "Extreme" rifle powders which are claimed to be non sensitive to temp extremes.

Why you want a "fast powder" I have no idea? Rifle powders are mostly slow.

If you are basing that on the same thought that fast powders in a short barrel pistol produce more velocity, then that is false.
Whatever powders produces the fastest velocity in a long barrel will do the same in a short barrel.

That said you are only gonna get the velocity that a 11" barrel can possibly produce.

 

[thump_rrr]

I have a 10.5" Noveske CQB and a 14.5" Afghan.
I run 24.5gr of IMR 8208 XBR through both of them.
CCI or S&B primers and Hornady 55gr FMJ with cannelure.
The 10.5" is running an H-2 buffer while the 14.5" is running a carbine buffer.

On a side note try some flat base 50gr HP bullets for under 200Y you will be surprised how accurate they shoot.