223 12twist heaviest bullet?
03-18-2011, 07:26 PM
#11
Nontypical Buck
Join Date: Aug 2007
Location: WY
Posts: 2,056
What becomes more complicated are the relationships between a projectile's center of gravity and center of pressure, and how those then interact with influences such as forward velocity and ballistic coefficient. I've probably forgotten too much to be able to explain it effectively here. Bearing surface is only one predictor of cg and cp, but it doesn't completely define either (construction and materials also play a role).
While the Miller and Greenhill Methods provide good guidelines to predict stability, I'd come to accept even prior to using either of them that my 1:14 .22-250 likes nothing heavier than 45-grains. My 1:9 .223s (bolt guns and an AR) generally prefer something in the 50- to 55-grain range, while my lone 1:7 AR prefers 60-70 grain bullets. Both of those methods generally confirm those preferences.
03-19-2011, 03:25 AM
#12
Typical Buck
Join Date: May 2009
Location: Colorado
Posts: 797
You can stabilize a lighter grain bullet in a tighter twist but hardly ever will you stabilize a heavy bullet in a slower twist rifle barrel. For a 1 in 12 twist barrel I'd stop fighting the bullet craze and go straight for the 55gr bullets. They'll work perfect for almost all applications in that rifle.
Head is right if you want to shoot 70 gr bullets buy or build the rifle that shoots those well.
Head is right if you want to shoot 70 gr bullets buy or build the rifle that shoots those well.
03-19-2011, 05:43 AM
#13
Nontypical Buck
Join Date: Aug 2007
Location: WY
Posts: 2,056
JMO, but the "rules of thumb" to me have more utility in deciding what bullet weight or profile NOT to use for a particular use than they assist in telling me exactly which one be perfect. Beyond that, here's another topic that winds up being WAY overthought. Go shoot it. See how it does. Adjust (THE most underrated capability and advantage of being a reloader).
03-19-2011, 09:10 AM
#14
Nontypical Buck
Thread Starter
Join Date: Oct 2007
Location: central and east texas
Posts: 4,894
i use 55g rem cl now, wantin somethin a lil heavier. i know its a flyin brick, but im stayin inside of 80-100 yards, and need a lil more thunderous impact on these hogs, tired of chasin em into the thicket...which is only 20-60 yards away. hard to crawl through them hog tunnels and get em. they never run far, but the thicket is close lol
03-19-2011, 10:48 AM
#15
Nontypical Buck
Join Date: Aug 2005
Location: S.W. Pa.-- Heart in North Central Pa. mountains-
Posts: 2,600
I'd probably look more toward 50-grain with a 1:12, but I've also used 55s.
JMO, but the "rules of thumb" to me have more utility in deciding what bullet weight or profile NOT to use for a particular use than they assist in telling me exactly which one be perfect. Beyond that, here's another topic that winds up being WAY overthought. Go shoot it. See how it does. Adjust (THE most underrated capability and advantage of being a reloader).
JMO, but the "rules of thumb" to me have more utility in deciding what bullet weight or profile NOT to use for a particular use than they assist in telling me exactly which one be perfect. Beyond that, here's another topic that winds up being WAY overthought. Go shoot it. See how it does. Adjust (THE most underrated capability and advantage of being a reloader).
...... Yessir... I agree.
