Thread: question re a 300 blk or whisper

Hi guys,
Im running a suppressed .308 that is extremely, extremely quiet, it’s an old omark thats bore was not up to standard for target shooting so I made it into a project rifle, I run a rather large suppressor on the old girl.

I have loads that are based on 220gr out to 240gr (when I can borrow that mold) from lead cast projectiles I make and size to suit barrel, roughly .310 out to .311. I I run it around 16.6 or normally 18BHN in hardness.

Ive also projectiles that have a HP that is brutal, but yet untested, their length is no way near as long as the ones mentioned above

The reason I prefacing my question is that I am considering a 300wisper or Blackout as a project and i have the ability to make very good loads using lead projectiles that i cast myself. I dont just make a heap and shoot em, if they are not up to a high standard when i cast them, they go back into the pot! Its good therapy

I am curious if anyone is running such a rig, and if they don’t mind sharing some info on usable case capacity, what is the OAL of the round, Barrel lenghts and rate of twist, as I want to work out what molds that I have that may well work in this project!

Also do you run lead (gas checked) through your M4/AR