I recently switch to the PTG spiral fluted bolt body and PTG bolt head on a couple of my Savage SA varmint rifles. It did take out the slop in the bolt since the PTG bolt bodies sold by Midway were slightly oversized 0.700" for tighter tolerance when compared to the Savage factory bolt body. Because of the tighter fit and spiral fluting, these bolt bodies do bind slightly when I first installed and tried to work the bolt quickly. Not a problem, since I use a SSS single shot ramp for bench and varmint shooting. But it might be an issue for a magazine feed rifle and rapid fire. The new PTG bolts have gotten better with time and a few hundred cycles to wear them in. I would recommend re-checking for the correct head-spacing if you switch out the bolt body or bolt head. My experience with the PTG bolt body and bolt head was no change on the first rifle, but I had to reset the head-space on the second rifle. As expected, there was no change in the inherent Savage heavy bolt-lift.
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