My 3 groove JES rebored Marlin 20" does great with Starline 2.082 length brass and bullets sized to .377. I started out with the Lee 38-250 mold, but later switched to an Accurate 38-250B four cavity, ordered as a plain base. Both have been really easy to get accuracy from.
I use 3 main loads, all with the same bullet at 10-12 Bhn.
10 grains Unique or Universal for a light plinker/practice load at about 1225 fps.
21 grains 4198 for a nice deer load at roughly 1400 fps
32 gr 3031 for 1600 fps and a substantial "whop" when it hits at typical woods ranges. This one I use powder coated bullets to help identify it as the heavy load. The others are pan lubed with Wind's Wonder Wax (50% bees wax, 40% Crisco, 10% Vaseline)
Wish all my projects had turned out as easy and successful as this one.
Last edited by Ole_270; 06/17/19.