Load Development, Powder Coating, Gas Checks, etc

[TXCOONDOG]

I ordered some of the "Clear" PC from Smoke. I will soon cast my first rifle boolits for a 300 Blackout (Semiauto) and Remington Model 700 in 308 using the Lee C309-200R.

My Alloy will be COWW + 2% Tin.

Powders of choice are 1680 for the 300BLK and Reloader 15 (works great for Jwords) for the 700, but I am open to suggestions.

The 300BlK will be loaded to subsonic (suppressor) and the .308 will be supersonic. I will let both rifles, etc determine the final loads (accuracy nodes). However, any advice on how hard a cast boolit can actually be pushed would be helpful. Of coarse, it depends on the rifle, etc so I'm just trying to get a better understanding (checking myself) for the limitations of cast boolits at rifle velocities.


My normal powder coating procedure using a mold with a PB design is to cast, size, PC and size again. Being my first time PCing and using a GC, I need your help with the procedure to save some potential headaches, if any.

Should I cast, PC, add the GC and size or ? As I'm concerned that if I size after casting before PCing then the swaged boolit my cause issues with how the GC goes on.

[clearcut]

It can be done both ways I PC then check , I push them around 2.400 fps.

CC

[Bloodman14]

Cast, size/check, PC, and then size again to fit the throat. Works for me and my SKS and 2 Lee-Enfields.