I dig your rifle! I had no idea you could add a custom bolt to the Savage actions. Do they come over-sized like the Rem 700s to provide a tight fit?
Your build sounds impressive and the accuracy it's capable of speaks for itself! I'm guessing it's quite heavy with that varmint barrel, HTG stock, and SHV optic up top. Where's the weight land? 11+ pounds?
The PTG bolt is available in different diameters. I actually ordered mine through MidWayUSA. If I remember correctly it measures 0.695 OD. It takes a lot of the slop out of the bolt for sure.
forgot to mention that I also upgraded to a trued up recoil lug and barrel nut from Northland Shooters Supply. Not sure if they added any accuracy but they were relatively inexpensive upgrades so what the heck.
Weight is right around 12 pounds. Not a lightweight backpacking rifle...but if precision shooting is required you can't beat a rifle with some heft to it.