I had a Jones rimfire accuracy gauge and gave up on gauging for rim thickness years ago as I never noticed a difference in several Anschutz and Feinwerkbau target rifles. Have always had the best groups with Lapua Midas followed by Eley Tenex. Haven't tried the Midas Plus or R50 yet but plan to shortly.
Every rifle is different so gauging for rim thickness may work for you.
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