I don't know either, but that is the gun clubs answer to why we cant shoot any thing smaller than a 69 gr on the high power range. I think they had an incident where someone got hurt, and they blamed it on the jacket from a 55 gr bullet
I don't know either, but that is the gun clubs answer to why we cant shoot any thing smaller than a 69 gr on the high power range. I think they had an incident where someone got hurt, and they blamed it on the jacket from a 55 gr bullet
The twist stabilizes the bullet, a 20 inch 1 in 9 twist may stabilize the 75 gr just fine on account of it having more time to stabilize it compared to a 10 inch barrel where it has much less time to set it flying straight. A 1 in 7 will not pull the 55 gr apart and if you are shooting only .223 and not worried about a 22lr conversion than with the short barrel the 1 in 7 seems the only way to go.
Not sure I follow you. What is the "time" it needs to set it flying strait? A 1:9 barrel will spin the bullet 1:9 pretty much any length. The issue is velocity. The shorter the barrel the lower the velocity giving fewer RPMs on the bullet. The longer barrel in 1:9 will spin the bullet faster because it is going faster, but it is still 1 rotation in 9 inches. Maybe that is what you were trying to say, IDK.
I shoot nothing but 55gr out of both my 1/7 twist 12.5" & 20" rifles. I regularly shoot at 300yds with no issues. I do not see how you could say it would hold together at short range, but come apart at long range when it is spining the fastest at the muzzle.
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