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I know a bit on this as I have done it, most worn/pitted 303/311-312 barrels will not clean up enough to go to 8mm, I had a light profile (SMLE type) & heavy barrel (MLM/MLE type) bored out to 375 but the 375 is VERY close to the sight holes & has to be keeped to low presure (I dont have the barrels as they can not be send to me now days) we have a poster on this site who rebore to 338/303 (a non Speeder round) & he likes it very much !
I like the look of some of the 9mm rimmed cartridges to !
Oh one barrel to look for & may be found shot/rusted out is a H profile heavy barrel that were made for the SMLE rifle, these have no rear sight holes & can be rebored out to what ever size you like, even up to 40cal, I was thinking of doing a 40/60 Maynard but may well go to 405Win as it will fit in my 1888 type mag .
This is a concern I have in the back of my head. I fear that if I can shoot .318s in it with poor accuracy, that boring to .323 may not clean the barrel enough. My next thought was to go to .338 or .358 if the barrel was thick enough to take it. I have read of some success with the 35/9mm as you may also use pistol bullets for cheap practice and vermin. I haven't found much on the .338 wildcats. I would be suspicious of getting a bullet soft enough to expand reasonably at the estimated velocity. I have a few old Hornady 200grn. bullets for the old .33 Winchester kicking around, but I don't believe they are still in production. A couple interesting alternatives to consider though! Does anyone have experience with either of these wildcats?
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Re: Help with shot out bore