Ian
Notorious member
I only used the RX7 because it was the only powder that modeled over 2300 fps from the 18" barrel without obnoxious muzzle pressure which would be bad for my suppressor over time. Pressure is in the 45-50KPSI range which is way more than anyone would normally want for a soft cast bullet, but I had hopes the PC and shape of the bullet would allow the bullet to jet up into the bore without much resistance and that would save the base from being squished. It seems to be working. I would prefer something like 4895, 3031, or Varget, but not in a barrel this short where muzzle pressure would run 10-12KPSI easily. Remember, this is a special-needs situation so I wouldn't say that RX7 is a great powder for the .308, but I made it work due to lack of better options.
CORE is the only thing that has me worried. I started with a patched-out but not solvent-cleaned bore and don't yet know if it was falling apart after eight rounds or it was just me giggling after looking at the chronograph. More shooting will tell. If I can start off clean and get ten rounds into almost MOA that would actually be good enough for the purpose of the rifle and load.
CORE is the only thing that has me worried. I started with a patched-out but not solvent-cleaned bore and don't yet know if it was falling apart after eight rounds or it was just me giggling after looking at the chronograph. More shooting will tell. If I can start off clean and get ten rounds into almost MOA that would actually be good enough for the purpose of the rifle and load.