Jayco, you mean the BBC's? They have been around since at least the early 70's.....pretty sure.....I've been using them since the early 80's IIRC.

OU: Good group! And what I have seen myself with the BBC's,the pre 64's and the 375 H&H! wink




The 280 Remington is overbore.

The 7 Rem Mag is over bore.