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Originally Posted by KevinB
Nope did not make the shot -- but I do know one end of a rifle
I had some early LandWarfare 5.56mm - Stan had said that since it that lot they have improved the accuracy. I shot it at 100m and 200m from the prone from a KAC SR16 16" midlength with Douglas barrel -- the carbine is submoa with some ammuntion. it chrono'd ~10 shot avg at 3800 fps out of the 16" bbl.
I have never been able to chrono the 9mm (I ended up mixing Ranger SXT in a Sig mag to see if the chrono was buggered - no dice onyl thr SXt tracked in the chrony) that was repeated at different dates (no idea on that one) it struck the tgt fine.
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Howdy Kevin,
You know that you are still welcome to ammo anytime. If the KAC 16" was a 1/7 twist the LW bullet at 3800 fps would have not been stable. Our estimated maxium RPM for a stable trajectory in the 5.56 LW bullet is about 365,000 RPM. If the rifle barrel you fired was a 1/8 or 1/9 then the bullet should have been stable. The ammunition you tested was optimized for the 10.5-14.5 inch 1/7 twist barrels and a seperate pressure curve is provided for the longer 1/7 twist barrels.
The short barrel LW round when fired from the 10.5 inch 1/7 turns 3,025 fps, 11.5 inch 1/7 turns 3400 fps, 14.5 inch turns 3450 fps.
The short barrel LW round when fired from the 10.5 inch 1/9 turns 2750 fps, but when fired from the 14.5 1/9 turns 3550 fps.
The short barrel LW round when fired from a 20 inch non ported 20 inch 1/7 twist barrel will not be stable and demonstrate excessive pressure to include blown primers. All of our clients are briefed on these performance parameters and limitations per bullet design as they are with respect to the comparative hard amor and tissue destruction performance.
The short barrel LW round when fired from an operational 20 inch 1/9 twist barrel will turn in excess of 3850 fps with a stable trajectory and no signs of excess pressure.
The Le Mas AP 9mm when fired from a Glock-17 will turn 1940 fps, from the MP-5 2225 fps, the Colt 10.5 inch 2300 fps.