I've had surprisingly good luck with 55g Remington PLHP. 1" groups @ 100yds in my 16", 1/7 twist m4gery. 1/4" groups at 100yds with my 20" 1/8 heavy barreled AR. And I do crimp. I've had too many problems with uncrimped bullets getting pushed back in to the case. Luckily they caused feeding problems and didn't make it into the chamber.
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