mcb
Member
I used 4227 in my plinking load, Berry's 220gr plate spire point bullet (right). Of all the powders I tried the 4227 load was the quietest that was subsonic and still cycled my 9-inch 300 BO.
Interesting I started with 4227 when I started working up a load for my subsonic hunting load a 220gr Maker REX (left). Despite the same bullet weight something about going to the all copper Maker bullet changed the burn profile enough that it would not cycle reliably. I had to switch to 1680 to get this bullet to cycle reliably and be subsonic.