I also resize my 300 brass with Small Base dies. As a matter of fact I reload all my cartridge brass period with Small Base sets. Only one problem incurred with such practice. Small Base die use shortens brass life to 6 to 8 Max charge firings. There after its quite possible its shooter will experience a unexpected case separation. Which doesn't bother me one Iota. Seen/had my share of case separations and than some through-out all the years of my reloading. Although such a unwanted experience may inhibit some other from using Small Base. Be advised the benefit of using S/B dies outweighs the negatives.
I'm kind'a anal when closing my bolts and levers. I prefer absolutely no hindrance not even the slightest feel of interference from my home reloaded cartridges. None!!
As far as first fired brass functioning thru a receiver . Some guns will. Others won't. Reason for such gun behavior? Being a honest Tom. "I don't know?"
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