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I canīt give you an advise on this one....however welcome onboard!!. I am sure there is one ot two members who can help out.

The H&H .360 2,25" Express
http://www.cartridgecollector.net/360-2-%C2%BC-nitro-black-powder

The .360 2,75" Express
http://www.cartridgecollector.net/400360-nitro-express-2-%C2%BE

It sound like some may have tried to use the .360 2,75" case?.

What does the rimdiameter on the extrators measure?...



BTW...Have you slugged the bore?. Done a chamber cast?. That might help to get facts in order to establish a further what-to-do-or-how-to-do?.

Pictures!!. You most know EVERYBODY in here loves to watch Pictures. If they donīt like to Watch nice chicks in light summer uniform they definatly love to watch vintage double rifles.





J.

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Thanks for the reply. Yes, I have taken a chamber casting



You can see the section that was reamed in front of the original chamber, leaving a sharp shoulder leading into the rifling.

The cartridge rim dia on the extractors measures .496

The groove dia in front of the chamber is .372. I need to slug the muzzle at some point to see if there is any taper in the bore.

I'll try to take some pics of the rifle itself and post them at some point.