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You may get an unsafe pressure condition trying to run the 303 Brit bullets down the 7.62 bore. The 303 bullet is .312"......7.62 bore could be as small as .308", which is .004" difference. If you tried the reverse, you'd get poor accuracy.
 

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Well, if it were me, I'd still play it a little safe & not run max-book loads thru either as long as you're just punchin paper. Good luck with them, jd45
 
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