On my present rifle, the one pictured I fired several proof loads and checked the tolerances after every shot. Now I am checking measurements after every shooting session, nothing has changed so far, I will keep you informed.
The new french action I am giong to use is large and the barrels are of the chopper lump design. It has four bites, three on the under lugs and a fourth as a hidden third fastner. The firing pins are rather small in diameter though I think I may want to cut them back a bit. I will post pictures as soon as I can and give the dementions of the new action in the next few days. As for my .450 you will have to waite a bit for those dementions as it is in the checkering cradle at this time and I can only work on it in my free time so it will be a while befor I cane post the measurements you guys asked for.