JD will only give you the info IF he made that barrel. There are some barrels around that SHOULD be called 358/444,because some other guy re chambered them. This is a HEAVY bullet barrel. light pistol bullets do not work well in it. 180's are about the lightest I've found to be accurate and nonexplosive.JD said cast bullets aren't going to work well. He was right so far. I use the 200 grainers in mine ,The Hornadys seem a little more accurate than remington bulk.groups are about 1/2" smaller.A deer would NEVER notice!
I've used 2520, h322 and IMR 4064 powders and others, the named ones were best in MY gun.
Trajectories from a magazine article datedsept/oct 1991(Handloader) page 33 were muzzle vel. =2250fps
50 100 150 200 250 300 yards
2.12 3.86 3.57 1.06 -3.94 -11.62 inch
velocity
2156-2064-1975- 1887- 1803- 1721 fps
energy
2529-2322-2128- 1948- 1779- 1624 FPE
This IS a hard recoiling round. It will knock deer sideways a step or two.I wish you luck with it!