SBR/pistol barrel length???
- By JWG
- Semi-Automatic Rifles
- 53 Replies
Since you say "work", I presume you mean the new Federal LE stuff or the older RA556B. The RA556B is shaped similar to a dump truck, but the new federal stuff is a bit better. I average around 2660fps with it from my 11.5. However, 275 yards is pushing it, as I believe that round has a 2000-2200fps floor, and a BC G1 in the mid to low .2s. Even presuming 0.25 G1, that puts you at under 1800fps by 275y. At 175 yards, you're running 2000fps. The last testing I saw on LE223T3 seems to indicate 125-150m will be the "I am sure it will work" range, and 175-200 is "man...maybe?"
I think people tend to err on the side of all planets aligning when it comes to PAD ranges in 5.56 projectiles. I'd prefer to err the other direction. I'd draw my line at 125m for that round regarding "this WILL perform". If you want more range, 62gr Dual Performance or 70gr TSX will extend that confidence level to 300 and 225 yards, respectively.
By perform, I mean you recover the round and look at it and say "Damn! Just like in the brochures" not "yeah, it did something, see the nose, there?"
An example is this 70gr TSX I recovered from shooting a white-tail lengthwise at about 100 yards using my 11.5. Predicted impact velocity was 2350fps:
