xausa-

Do you have a clear enough understanding of the proof marks on your drilling to properly interpret them well enough to discern it's date of proof and it's service load?

If you don't have that knowledge, do yourself the favor of very clearly photographing the proofs on this gun and posting them to this thread.

There is definitely the knowledge in this community to properly read the marks, understand their significance, and translate the story to you with reference to published standards and data to back up the results.

--Tinker