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Allthough it was originally black powder proofed it has since been nitro proofed. 19 tonnes is stamped on it from nitro proofing. There appears to be a lot of meat on the barrells but as you say the action could be a problem. I will post pictures and measurements just in case it could be possible.

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snky35,
Welcome to the forums!

I would love to see a couple of photos of the proof and re-proof marrks on your rifle.
The 19 tons sounds very high for a re-proofing to 9.3X72R.
I wonder if the 19 tons mark is a genuine proof mark.
It would be great if you get a chance to post some photos.
Thanks