I have shot PMC 7.62x39 brass with CCI200, 9 1/2, or fed 210 for 20 years with a hot load of 2230-S with my own 55g hp, 60g HP at 3550 out of 24" barrels, accuracy is in the low 2's or better. We shot a lot of the 60 Sierra Hp also with fantastic accuracy and blow ups on p. dogs. I am about out of the 60g that I made and will be trying out the 55g Nosler as they have worked so well in the custom 6br's that I have.
We shot untold thousands of these in retired BR rigs and Rem 700's with amazing accuracy. On a hot p. dog town, you could shoot 5+ dogs a minute with the RBLP.
The AA2230-S is so easy on barrels, at 8000 rounds, the barrel would still agg in the 2's, 1-14 twist Harts that started off with short leade.
I built a Sako Repeater off an A1 in 22 PPC with a 9 twist, it was amazing with the PMC brass with any bullet you wanted to shoot through it.
Now, forming brass from the 7.62x39 case is a lot of work and is just not worth it, unless you have long Winters with little to do and like to tinker on your gun stuff. I turned my case necks using a drill press and lee wax for lube.
I tried shooting the 68-70g bullets on p. dogs, chucks, J. rabbits, crows and they have the trajectory of a 45/70! For live varmint shooting you unzip a lot of animals shooting low as the range changes a little since your last shot.
So, the 55g Nosler and 60g Sierra are really great varmint bullets and have a very flat trajectory to 300+ yards. We shot many p. dogs' head off at 300 yards as they would just barely stick the top of their heads up out of the hole!
Take a look at the BC of the 55g Nosler, it is impressive! Also, the lack of bearing surface keeps you shooting long strings in between cleanings.
For chuck shooting at ranges of 450 yards and less, the 6PPC is a fantastic cartridge, and easy on barrels!