Home Forums Reloading Varmint Rifles which powder for .223 that will get 4000 fps

I have a 223 with a 26" Hart with a Minimum SASMI spec chamber that will put all the bullets in the same hole at 4000 fps with the 40g Nosler.

I use IMI or Lapua brass
7 1/2 or BR-4 Primers
Vit N-133 powder.

My 26" 223 AI will shoot the 40g Noslers at 4200 with N-133, formed IMI brass and 7 1/2 primers.

N-133, Tough brass, and thick cup primers are the key, the minimum spec chamber with Zero freebore may help seal the gasses behind the bullet.

With N-133, I shoot the 50g Noslers at 3800-3850 fps into extremely tiny groups in the 223 AI....no brass issues yet.