cayugad
Probably the short black regular Harvester... that will be my first try with the shorter bullets, them HPH-24 with the 300 grain bullets.
Shoot - just read your last sentence - the .503 did not want to go - I do not like that... OK I am going to take my breech plug out right now and try some different loads, but if the 503 would not go - then you are looking at a "crush rib" or 3p...
Give me five minutes.... and I get back...