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I've had the same thing happen to me with heavy-bullet loads for the .303 British, except in the opposite direction, and (I suspect) for the same reason as suggested above - the service SMLE barrel is LONGER than a standard pressure barrel. Bonus!
What are you hoping to shoot, and at what distance? Are those extra hundred-and-something fps and/or the energy they bring actually important at those ranges? Questions to ask yourself.
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