Years ago, DuPont published a load for 1 oz of shot and 800X powder. It was OK in warm weather, but nasty in cold weather. I questioned DuPont about it, and they said "Oops, we shouldn't have put that load in the book". I threw away about a half a case of those shells

800-x is made for the heaver loads and smaller gage guns. i don't think i have seen a 1 oz 800-x load in 12 ga.???

Here's a scan of a 1983 DuPont loading brochure. The page I've scanned is for Peters "Blue Max" hulls (remember them?) but there are similar loadings for all the popular hulls of the day

Thats the same type of book i have, look at the 97 primers and the blue max shells, i have a new box i think, i remember them well:shock:

In the IMR reloading handbook they show 24grms, not a 7/8oz load. That's a International load, but only about 10 or 12 BB's less then 7/8 so basically it's the same. In the data sheet that came with the CB-4100 wads they list three different loads with 700X for 7/8oz in a Remington hull. The 16grs/1200 fps at 6600psi, 17/1250 at 6800, and 18.5/1300 at 8600psi - so I'm loading 18grs and it shot good at 0 degrees. I'm assuming I lost 1500 psi or something because powders are tested at 70 or 72 degrees [ can't remember ]. The others may work at hotter loads but I found one for the components I have so I'll leave it at that. In the summer or warmer temps I'll go back to my lighter loads.

my first register shoot is always in February, I use tite wad in the cold , switch over to 800x in the warm weather