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M1 grand man - - -
(Been meaning to ask: does screen name mean, like, "great guy," or tie in with M1, as in John Garand?)
Anyway---Are you using the .311 bullets, which are normally the proper diameter for .303 British?
Or, possibly, using .308 " bullets for some reason? I'm told that some sporting rifles chambered for this ctg do best with smaller diameter bullets. If the latter is the case, and you are using proper .303 Brit dies, the expander plug would be too large for the .308 dia. bullets. You can buy a different diameter expander plug, proper for the smaller bullets.
If the former is the case, you probably need to go to your favorite loading component source with your caliper in hand, and measure YOUR expander ball, and then the one in a new set of dies, and see it they are the same. If not, you might need to buy a smaller one, or get the current one turned down by a gunsmith or machine shop. I'd imagine it'd be less expensive to buy/order another one, because machinists' time is not cheap.
Best,
Johnny
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