AR-15 Ammo thoughts

[KurtM]

I've had 1X9 barrels shoot 77 gr. Bullets very accurately. I've had 1X7 barrels that did very well will 55 gr. Bullets that wouldn't shoot heavies worth a damn. I've got a 1X9 barrel that incredibly accurate with Sierra 69 gr bullets 1.5" groups at 200, but won't group 68 gr. Hornady at all....to the tune of 6-8" at 200. I would hesitate to buy a lot of any bullet, until I had a good idea of what my barrel likes! And I would shy away from selecting ammunition based on twist rate.

 

[edl]

http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi
this is a calculator which provides a guide to stability as it relates to weight, length, and caliber. BUT, Kurt is correct, actual results trump all speculation.

 

[JEVapa]

http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi
this is a calculator which provides a guide to stability as it relates to weight, length, and caliber. BUT, Kurt is correct, actual results trump all speculation.

JBM is a great resource

 

[Sgt Dog]

Great comments.

I appreciate it.

 

[cowadle]

i scoped up a modified savage hog hunter 223 and topped it with a scope that has a BDC built in. i found that the freedom 75 grain fits the BDC perfectly but my rifle supposedly has a 1 in 9 twist barrel. it really should shoot the 68 grain better but in reality it likes the 75 grain match bullets. the bdc calculators really helped me narrow down the candidates.