I run PCed 35 200s in the 357 Super Mag, 358 MGP and the 35 Whelen rifles to 2,400-2,600 without a GC. RCBS discontinued the plain base 200, years ago, but Saeco still makes a mold in the 200g RCBS plain base. I just PC the bullets then bake nose down in a hardware cloth box to solid coat the base and bearing surface. I size to grove diameter using case lube.
I buy my powder coat material from an auto parts coating, material supply house. I also prefer black for my bullets.
3031 is a very good powder in the 30-30 capacity size cases as is Unique and 4227. I use 1680 in the MGP a 6.8 necked up for the AR.