The problem with rimfire subsonic is that max weight so far is 60 grains in the Aguila line. It takes a special twist rate to stabilize, and won't have the punch of the 75 grainers. That being said, I have a subsonic load in .223 that utilizes the RCBS cast boolit that casts out at 62 grains with my wheelweight alloy. Fun little round...
Kevin
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