A super long, sleek, VLD bullet with lead core may also not stabilize in that same twist as well.Īnd last but not least. The classic Greenhill formula was for full lead bullets and is barely, marginally, accurate for cup and core bullets for twist vs stability.Ī short stubby heavy bullet will usually stabilize in a slower twist than the book requires for a certain bullet weight a non lead bullet that is much longer than an equal weight lead core bullet may not stabilize in a twist generally associated with that weight bullet. My friend had a Rem 700 in 1:12 that shot 69 gn SMK's just fine as well.Īs has been mentioned in the post the length of the bullet is the issue, not the weight. It was not a full bullet profile going the through the target but consistently a rectangular hole one bullet diameter by two bullet diameters. Accuracy was still acceptable but marginal for what a 223 is capable of, but was not a clean round hole like the 55 gn did. I tried 69 grain Sierra HPBT Matchkings in it just to see where the upper limit was. It shoots 55 grain Sierra HP Gamekings just fine. I have a Win 70 223 rechambered from a 1:14 twist 222. If you are only planning on using 40-55 grain offerings 1:12 or 1:9 are not an issue.
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