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Brithunter, The 1x10 twist should stabilize the 80 and 100 grain bullets just fine. If you go over 100 grains you may start to have trouble. The .243 Winchester has a standard 1x10 twist and has not trouble with those bullet weights. The Remington .244 originally had a 1x12 twist and would n't handle the 100 grain bullet. Remington reintroduced it as the 6mm Remington with a 1x91/2 twist and it does fine. I regularly shoot the 6mm Remington with 85 grain bullets for long range varmints and the 100 grain bullets for deer and antelope (pronghorn). The caliber is marginal for big game but the bullets are fine as long as shot placement is good. But the 80 and 100 grains bullets should stabilize without a problem with 1x10. Have your gunsmith go over the gun. If it has been rebarreled, have the gunsmith ascertain there is at least 0.005 clearance between the bolt face and back of barrel.
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