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Cartridge won't chamber:
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Pat
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January 24, 2021 - 5:31 am
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I recently purchased a 300 h&h mag mod 70 pre 64. A factory load or handload won’t chamber or really come close. It lacks a good 1/8 in to 1/4 in for the bolt to close.  I took the gun apart and the underside is stamped 300 M 5 on the barrel. The receiver has a proof mark the barrel doesn’t. It says Winchester proof steel and 300 h & h mag on it. The gun was made in 53. I don’t think it’s been rechambered to 300 weatherby or anything bigger being the h & h case won’t drop in or come close to chambering. I’m no expert by any means. I would think the h & h would drop in to anything it could have been rechambered for. Does anyone have any idea what the problem could be? The serial# is hard to read but it appears to match the guns serial # .  The rifling looks very good. 

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January 24, 2021 - 1:11 pm
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I’d look closely at the barrel shank and overall length of the barrel and take some measurements. It’s possible it was set back a turn or two and rechambered, possibly to 300 Win Mag or similar.

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January 24, 2021 - 2:23 pm
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Examine the chamber closely by eye with a bright light. (even better if you have a bore scope) There may have been a case head separation which will leave a portion of the casing in the chamber. Easily fixable using Cerrosafe or lead.

Erin

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