Back in the 70s, when I first started shooting trap, all I used was 700-X. I still use it today, along with other powders [ promo - because it's so cheap ]. It's a great powder that works in any weather. Many times if one thinks a powder is too dirty or doesn't pattern right, a different charge can make a difference. Also being a black powder shooter, I don't find any nitro load dirty. The next load blows out any residue left. With a Rem hull, Claybuster list in their 4100 wad meant for 7/8 or 1 oz loads, three different loads. In the 1oz loads the pressures are from 7500 to 9500psi, and the 7/8oz loads they're from 6000 to 8600psi.