Originally Posted by
Harter
We have a Mk X varminter in 22-250 . It doesn't take upper end loads to run up over pressure in the heat . I bought a 50 pack of the Winchester 45 gr 4000 fps rat exploders and the 9th round with 90 seconds to 2 minutes between shots dropped the primer out . Upon closer inspection 6,7,8 had gas leaks . Hand loads that repeated the events were 3031 and a 55 gr FMJ at about 3600 fps , a down in the middle load way off max load .
I think it has to do with how the Mauser and specifically the 308 length and sub 30 cal heavy barrels shed heat around the chamber . I don't have any test data to back that but the 7&8×57 wouldn't have remained combat rifles from 1895-1957 if it were a common problem there .
I ran a bunch of loads in a short period of time through a Santa Barbara 98 in 358 Win with no issues but the heat of the day was only about 80 degrees . That action was machined OM for a 4" OAL as an action only sale , not in the standard 3.5" Mauser .
It's interesting that you got spray . By WWII the 98 had a gas escape on the front ring and by design most of the gas and debris ended up in the mag well . The bolt shroud , even the slicked up Winchester ish and others , should have deflected whatever made it down the race ways . Unless like me you shoot left handed .......
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