Rebarrel a BRNO 21H?

rci2950

rci2950

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Hi all, I have a BRNO 21H that the barrel is well worn and there have been some modifications to the stock by the previous owner. So my interest with this one is to eventually (once I finish shooting the barrel out) to rebarrel it and place it in a new stock. I was wondering with the 21H is there any special consideration for barrel? Is it just simply a Mauser 98 barrel? Also with the gun now being a 7x57 can I change this to something like 270 win? Will the receiver allow for this length of cartridge?


 
It is a small ring small thread Mauser... and will handle a .270 Winchester just fine... or a .280 Remington... or just about anything based on the 30-06 case.
 
Is it the rifling that is gone? Or the throat? Just re-chamber it to .280 rem or 7x64 if it's not the rifling. May have to open up the feed rails a hair but should work very well. Otherwise just rebarrel to whatever you want - 8x57,280, 270, 30-06, etc. The longer than 57 mm cases may need some rail work (or maybe not, depends on individual receiver).
 
OldPrune said:
Is it the rifling that is gone? Or the throat? Just re-chamber it to .280 rem or 7x64 if it's not the rifling. May have to open up the feed rails a hair but should work very well. Otherwise just rebarrel to whatever you want - 8x57,280, 270, 30-06, etc. The longer than 57 mm cases may need some rail work (or maybe not, depends on individual receiver).
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One might like to think rechambering to a longer 7mm would be possible but, unless you like a rifle with a ridge in the neck, it won't work. The neck diameter for the 280 or the 7x64 is smaller than the 7x57.
 
Leeper said:
One might like to think rechambering to a longer 7mm would be possible but, unless you like a rifle with a ridge in the neck, it won't work. The neck diameter for the 280 or the 7x64 is smaller than the 7x57.
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Ha.... Bill this is interesting. Thanks for catching that. I thought the reamer would take out pretty much all of the throat and cut new one. You saying there is enough of the old throat left to make this a problem? If so how about setting the barrel back a bit (i.e. couple/few turns on the threads). I admit this is now a lot more work for a barrel that has sights and you want it to index correctly but could still be cheaper than new barrel no?
 
OldPrune said:
Ha.... Bill this is interesting. Thanks for catching that. I thought the reamer would take out pretty much all of the throat and cut new one. You saying there is enough of the old throat left to make this a problem? If so how about setting the barrel back a bit (i.e. couple/few turns on the threads). I admit this is now a lot more work for a barrel that has sights and you want it to index correctly but could still be cheaper than new barrel no?
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It's not the throat it's the neck diameter...
7x57 neck diameters are large... and in length end up within the length of a 7x64 (or .280) leaving a neck with a step in it... the old 7x57 neck and the new 7x64 (or .280) longer neck.

Sam Elliott used to re-chamber many 7 x 57's and simply opened up the neck diameter slightly to get rid of the two stage neck normally left when you re-chamber the 7x57 to 7x64 (or .280).
 
Yeah I meant neck not throat. I looked at the dimensions of the 3 cartridges (7x57, 280 and 7x64) and now see that there would be something like 1.63 mm of old neck dia left in the chamber if 7x64 reamer were to be used for example and the barrel not set back. Cool. Learned something I did not know before.
 
Judging by your first picture someone really did a scab bedding job on your rifle. I can see Bisonite or maybe Plastic wood between the barrel and stock wood on the left side, and a huge gap between the left receiver rail and the stock wood. It sure never left Bruno like that.
 
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