Have owned a 37 for about 12 years. Find ammo it likes and shoot it. Shooting vintage class , went on to win 23 of 24 matches in a 2 year period. Got away from rimfire for awhile , but now starting back. Enjoy
Working up loads with 4451 , but what can I expect from 20 in barrel. Already ran 41.5 at 100 with less than half inch spread? Not sure if it has enough gas to go 1k