What is a good load for fire forming brass and what are some recomended powders? Also please share any load data you have for 75 and 50 grain bullets. Thanks in advance.

ok, i managed to dig up some info on fireforming loads and 50 grain loads, now lets here those 75 grain loads.

I had some standar reload 50 gr Sierra and 37 grains of H-380,They fire form just fine.

They had been reloaded 4 times before.Only lost 1 caes with a split neck out 50 rounds.

Look in a reloading book for Varget and H 380.
IMR powders in 4064 and 4320 were the best groups.

Try some 60 gr.Bergers .

Mine is a 1 in 12 twest.Shooting 5 shots at .409 all day.But easy to get 1/2 inch
9 1/2 M primers.
Good luck ,you'll love the imp.

Scott

Just looked at some loads and targets.

This in my rifle so you had best back down and work up.has a 27 inch Lilja barrel 1 in 12.

the load for 3 shots was Varget =38.5 grains/CCI 200 primers.52 grain BT.These were seated out to 2.465"
best for 3 shots,one ragged hole .251.
Still brakeing the barrel in and working up loads.primers getting flat,with a little burr at the firing pin mark .
So they are a little hot or getting there.
I would start at 36 and work up.