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Shane,
I have Ruger I almost thru in the mighty 'Sus until I tried IMR 4895 and up close to the lands. IMR 4064 woked just as well 1 grain difference. I've settled on the 55 grain ballistic tips although the 50 and 52 shot the 55's were better. Check your bedding and like Rocky suggested sometimes forend pressure about 1-2 " back from the end, may take some experimenting with different thickness shim. Some factory barrels do take a few rounds to 'come in'.
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Kevin
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