FWIW, both GreTan and BAT Machine both do an outstanding job of bushing M700 bolts and fitting to the firing pin.
If you really want to set up that M700, check out the complete striker replacement in titanium or stainless from Hollands Shooting Supply. No binding coil mainspring, no silly bolt lock, and a better looking bolt shroud to boot.
http://hollandguns.com/
Lousy pic, but compare this assembly to what you see when you take down your bolt:
No bound-up ill-fitting spring, no rough-finished heavy firing pin or oversize bolt shroud..... just a sweet custom-fitted assembly that will also decrease lock-time on the inside, and look better on the outside. One of the many things you can do to a M700 that the factory could and should do, but won't for reasons we're all aware of ($). With a good trigger and one of these replacements, a M700 takes on an entirely new personality.
and extraction was getting a lot harder. I did finish shooting this load, 3 more rounds and each time the same thing happened. Before I started shooting my last loads for the day, we examined the primers and noticed the 5 all had pierced primers and very flattened. What I had not considered was the heat building up in my test loads and the fact that H335 is not 1 of Hodgdons extreme powders. I still shoot a lot in to late spring and early summer in temps sometimes over 100 degrees, But I do keep my ammo in an ice chest until ready to shoot. This I learned from experience. Different primers may not have pierced, but my guess is that any other primer would not have made the situation any better or safer!
Darrell has built some rifles for me, and they are the absolute most accurate guns in my safe, and demonstrate about the best quality work I've ever seen anywhere.