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I have tried H4895,H380,748,Varget,IMR4895,IMR4350, bullets, sierra- 100's, 120's 140's 150's Nosler ballistic tip 120's 140's I use a overall length gauge and bullet comparator. I would say my best group was maybe 2.5 in at 100 yds but I really think I should be doing much better.
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Time to look at the Rifle and the Optics.
If none of those loads would do better than 2.5, it ain't the ammo.
Is the rifle bedded? Free Floated? Rings and mounts checked? Scope 100% reliable?
Have you given the rifle a good soaking with a good foaming bore cleaner to remove all traces of copper?
I have had a few Rugers in my day and I can tell you that some of them had the roughest barrels I have ever seen. If this were my rifle, I would foam all the copper out then give it a dose of Tubbs Final Finish bore lapping bullets. If that didn't fix it, I would sell it.