Ok guys, I recently rebarreled my Winchester M70SS 300 win mag. I've kept the caliber the same, but replaced with barrel with a 1-10 twist Hart#5 contour fluted barrel cut to 24". The action was also blueprinted and squared, sitting in a HS precision stock. I went with the 1-10 twist on the recommendation of Hart, as they said it would be the best all-around twist for my style of hunting. Is my twist to fast for lighter bullets????The gun will be used for mostly whitetail, but will be used on bigger game in the future. So far I have tried: 1. Remington Corelokt 150gr psp 1.5" group (advertised @ 3250fps, chrono'd 2909fps 2. Winchester Powerpoint 150gr and 180gr 2" group on 150's and 1.5" group on 180's 3. Hornady Custom 165gr btsp 2.5"group 4. Hornady Superperformance 165gr GMX 1.5" groups 5. I just received today my HSM 168 Berger VLD Hunting. I will try those in the morning. I"m starting to get a little frustrated with the accuracy of this gun after spending almost a grand in custom work. I know my gunsmith does excellent work and I don't believe that is the issue. I shot all these off a solid rest and I'm not sensitive to recoil, so I don't think its me either. I really don't want to have to get into reloading to get this gun to shoot sub moa. Could ya'll please provide some insight on some other ammo I could try that you may have had or not had good luck with.