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After reading your post I'm still not sure if you are using RCBS case lube or one of the other substitutes when lubing your cases. Are you using the RCBS case lube and applying it with your fingers? AS has been pointed out your M-1 Garand may have a oversized chamber, using a micrometer mic over the expansion ring (the part of the case that isn't supported by the chamber). If the measurement is more than .470" it is an oversized chamber, usually most fired 30/06 cases will measure between .467" - .4695".. William
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