Ammunition: 7.63x25 Mauser Vs. 7.62x25 Tokarev

[reiver]

Picked this up the other day...the barrel/extension does not match the frame by about 3700 pistols but is tight to the frame. The internals don't match either but are 'tight' and it has been converted to 9mm by a nice sleeve that has great rifling. There is a slight dimple at the bolt stop but I suspect because the springs were not changed out.... I do not fear for my life.
It shoots well and cycles well (after I changed all of the springs and the bolt stop for new) but was piercing primers...
Took a while to get a balance between the new springs and that firing pin. I shortened the FP tip and rounded it (numerous times) ...took a few coils off of both the firing pin return spring and the trigger spring (both very stout) and finally got there.
You can't go too soft on the hammer spring as that also helps retard the bolt upon firing/cycling....there is a fine balance there between the bolt return spring/hammer spring/firing pin return spring.
That took a lot of re do's and went thru a box of Blazer Brass 115 9mm (which is a lot less stress than the original 7.63x25) on the 100 year old booger. Regardless, that is half of the fun.... I have Lugerman refurbing a 9mm Broomhandle so this will do for furn.
The internal mechanism is simply amazing in its complexity and design...the Federle brothers were genius.

It does have a nice dimple but I do not fear for my life and will shoot it, have shot it....the dimple (not as pronounced as the pics in this thread) is due, imo, to not balancing the 3 primary springs...hammer, recoil/reset, and firing pin.
If you shoot this system with a weak hammer or recoil/return spring you will send more impact to the bolt stop than was initially planned.... regardless of ammo. I think many focus only on the recoil / reset to battery spring and ignore the hammer spring that also acts in retardation of bolt recoil. If these two are balanced you will have no issue with the bolt stop absorbing more than it was designed to.