If your rifle is not splitting cases when using other cases, I'd suspect a bad batch of cases were given to you. They may have been reloaded a bunch of times or had someone aneal them wrong, or have some other problem such as some having been shot from a fluted chambered rifle then re sized. The fluted chambers wrech havock on case necks. They may not all have been shot from Rems.
If you are sometimes getting spit cases from new cases, I'd have the chamber checked to be sure it's within spec.
I'd pull the bullets, save the powder and throw away the brass you were given. Safety is much more important than 500 rounds of free brass. Keep the bullets to make fouling rounds from.
John K
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