I've gotten 2 and a quarter inch groups out of 38 gr. of H4895 and a 500 gr. round nose bullet from a Trapdoor with Buffington sights at 200 yds. Frank Barnes recommended the load in the 1973 Gun Digest. The oal of the cartridge is .2" longer than the common 405 gr. load.
YMMV
Regards,
Tam 3
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