I would agree that when using the solid copper bullets you can get better results with more speed. The sectional density becomes much less of an issue when the bullet doesn't lose weight. You do have to be sure to use the loading data specifically for those bullets. They create pressure differently partially due to the greater resistance to engraving by the rifling. I have watched a guy drop a Barnes bullet over his normal Sierra boat tail load & have to open the bolt with a rubber hammer. The most important thing is to spend a lot of practice ammo from field positions. Good bullets in a bad location are still bad.
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