dukefan70
Member
First, I know what 1:9 or 1:7 means, but I want to understand why its important, especially with bullet weights. For example I've read that a 1:7 twist in an AR is more desirable for a heavier bullet than 1:9.
1. General explanation or anything I'm wrong on.
2. Is the extra twist purely for extra speed with a heavier round?
3. What is considered too heavy a round for a lower rate of twist in an AR example? With 55 grain being normal, is 62 grain OK or pushing it? 75 grain?
Thanks in advance.
1. General explanation or anything I'm wrong on.
2. Is the extra twist purely for extra speed with a heavier round?
3. What is considered too heavy a round for a lower rate of twist in an AR example? With 55 grain being normal, is 62 grain OK or pushing it? 75 grain?
Thanks in advance.