There's a 700X load that uses 1 oz. of shot and scoots out at around 1,000 fps. Not bad for developing only 6,400 psi. That's what I use, although my cousin is in charge of loading'em. He's a big-time trap shooter and a newbie vintager. He's now using them for his league and Annie-Oakly shooting as well..
Ken

I prefer wood to plastic, leather to nylon, waxed cotton to Gore-Tex, and split bamboo to graphite.