223 Rate of Twist?

[D@D 0]

I have a 20.5 in barrel 223 what is the rate of twist? What grain would stabilize better in it?

[Onepoint 0]

Mine are 1/9, but I suggest you patch test it.

 

" Wrap a tight patch around the cleaning rod that is freely rotating in a handle of some sort (or you could try to turn it as you push it in if you get a feel for the resistance). Insert patched rod in barrel, mark a spot (tape with a dot, sharpie dot on the rod, observe a scratch on the rod, etc). Push rod through barrel and watch it turn with the rifling until the spot marked rotates to the same position (ie, you saw a mark on the "top" it rotated around as it pushed through and is now on "top" again). The distance it (the spot/mark) travelled its one rotation is going to be your twist rate (ie 7" =1 turn in 7" inches/1:7, 9"=1 turn in 9"/1:9, etc.) "

 

1 in 9 will handle up to 69gr, 1 in 7 will go up to 77gr.

[dayanx 1]

isn't milspec 1:6 right now? maybe it's different for carbines than it is for longer barrel rifles. I know the gold stndard with the big 50s seems to be 1:15

[bob_L 0]

I have a 20.5 in barrel 223 what is the rate of twist? What grain would stabilize better in it?

 

I contacted RAA a few months ago to ask the same question. Their reply was that the rate of twist on the 223 barrels was 1:10.

[MaineMarshal 0]

I just contacted RAA a couple days ago as well regarding this same question. I have the 16.3 inch brl and was also told 1:10.

[easy610 0]

Doing the patch test I came up with 1:11-ish...not exact. Sounds like 1:10 makes sense.