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The National match gas tube leanth 2 inches longer than rifle leanth will slow down the dwell time of the bolt which allows the brass to relax .a h2 or h3 does the same thing itchanges the dwell time .thats why they make them.the 22 nosler brass is the weak link to soft .I would like to see nosler make some harder brass to see if it would help  take the pressure. I really like this cartridge it just needs the bugs worked out of it.