I've bought some 405gn Hawkesbury Blackhawks in 458 for some cheap(er) shooting. These are a coated hardcast lead projectile (no gas check). I haven't found a great deal of info on them but I think I have to keep the velocities below say 1800fps. These projectiles are meant for 45/70.

I use ADI powders. Today I tried using a reduced load of AR2206H - bad idea. First shot a hangfire, second a misfire with the bullet stuck in the start of the rifling (and powder throughout the action and magazine when I opened the action). Because I don't live far from the range, I went home and came back with some reduced loads using AR2205 and a filler (cotton ball material) - I use this powder for cat bullets in my 375H&H. First two shots good. Third shot a misfire, stuck bullet etc but at least the filler stopped the powder from spilling everywhere.

A guy at the range suggested I use magnum primers and AR2207, said there is a difference in how easy the powders will light up and stay lit - AR2206H and AR2205 goes out easy if it has room to get blown around the case (I must add there was evidence of some burning by the change in colour and bunching together of the granules for the misfires). I didn't realise that this quality existing with the different powders since it is not spoken about, but this guy has lots of cast load development experience and has seen all the things that go wrong.

I checked the ADI website but AR2207 loads start at 2000fps and Trailboss will only do around 1000fps - I'm looking for the gap in between. (I know another guy that uses Westcasting 405 projectiles in his 458Lott but these are rated to 2100fps. I don't remember his load - I'll check the next time I see him.)

Do I get rid of these projectiles and buy the Westcastings, or does someone have a load out there that will do what I'm after.