With a 1:7 twist a heavier (than 55)bullet (all other things equal) will probably work better.
Any of the premium brands Nosler, Sierra, Hornady all work well. For hunting deer with a 223/5.56 I would think a heavier bullet would be better anyway.
For range blasting the 55 gr you are using are fine, I use them also and get about the same groups as you, I am not getting money, throphys or medals.
Any of the premium brands Nosler, Sierra, Hornady all work well. For hunting deer with a 223/5.56 I would think a heavier bullet would be better anyway.
For range blasting the 55 gr you are using are fine, I use them also and get about the same groups as you, I am not getting money, throphys or medals.