I had a Rem 700 in 243 that did not like anything lighter than 75gr. Groups would spread out to 4" at 100yd. Dime size groups were easy with the 100gr.
Conversely, I have seen benchresters make one hole groups with the lighter bullets approaching 4000 FPS.
Its all about your barrels twist. Most of you heard the story about why the 243 practically killed off the 6mm Rem.
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