I know it's a Mauser. But which one?

The simple way is to pick a piece of buckshot or a fishing sinker just bigger than the barrel and tap it in the muzzle with a soft mallet. Then push it out with a cleaning rod and measure the outside diameter of the lead where it was driven into the grooves. That is at or near bullet diameter. A 7mm will be about .284".
 
I cannot get the scope off. The guy I got it from must have loctited the scope ring bolts in. I actually broke my allen wrench trying to get them off.
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There is a technique to break the seal on the permanent type of locktite is without having to use heat. Anchor the gun really well in a rest. Put the allen wrench into the screw (I'd see if I could use the other end of that broken wrench) and use a hammer to apply several good solid taps straight down onto the screw. The shock can break the seal on the loctite.

Good luck.
 
Most of those Loctite adhesives and epoxies break loose at about 400 F .That won't damage the steel.
 
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