Started grinding work on 1858 Pietta Rem. for a cylinder conversion, more specifically relieving the loading gate area. 15 minutes into the grinding using a Dremel and a stone a crack appeared.
The question is: A) Did I cause it by overheating the metal?
B) Was the crack already there in the casting and I had to get down to it?
Pictures might help to get an idea of the size of the crack.
The revolver will be used for black powder only but it is in 45 colt.
Another question is: Should I fear shooting it will make it worse?
Feedback needed
Ramar