Recoil is a function of payload and velocity. There isn't much of a way to manipulate physics. If you want 1200 FPS, then find a load for either of the two powders you have, but if you want low recoil, then you are going to have to give up payload (try 7/8 or 3/4 oz loads) or reduce your velocity down to around 900 fps or something near that with 1 oz loads. You will still be hitting birds pretty good from the 16 with 900 fps, not so much from the 27 maybe. Your 700-X and Promo powders are both pretty fast, so will work for those lighter loads too.
And for those that claim that some powders shoot softer, it's mostly mental too. Remember, trap shooting is 90% mental, this encompasses everything, even perceived things.
Bigbob, given the 1oz and 1200fps constants, the only way to reduce actual recoil is to use less powder and the lightest possible wad. The WJ was LT mentioned is a good choice. 700X is harder shooting than Promo, but you have to use a tad more Promo to match velocities.
If felt recoil is your real concern, I'd suggest trying either American Select or Solo 1000. Both make superb 1oz powders and are softer feeling than the two you have.
The biggest bang for the buck in reducing actual and felt recoil is reducing velocity. A reduction from 1200fps to 1145fps will make a noticeable difference in recoil, but not in leads or breaks.
Federal Go;d Medal Extra Lite Papers shoot real soft for me. You get a full 1 1/8 oz of shot at 1100 fps. I like 7 1/2 size shot as it retains its velocity and energy. I just don't like 1 oz. loads.
To reload an equivalent shell, I use 18.5 grains Green Dot, F209 primer, 12S3 clone wad and 1 1/8 oz magnum 7 1/2 shot. IMO, the paper hull and base wad smooths the recoil sensation. Paper compresses, plastic does not. Warning, this makes a great handicap load.
Thanks to everbody for your help. Had my k80 fitted by Mike at Pms Firearms. we added wieght in stock and new recoil pad. It helped but still trying to find a load that will break those long crossers but not hurt my cheek bone. Thanks again.
#8's at 1150 fps, Winchester or Cheddite Primers, 18.0 gr. of Green Dot in a Winchester AA Hull, CB 1100 Wad
#8's at 1150 fps, Federal 209 Primer, 18.0 gr. of Green Dot in a Remington STS Hull, DRTGT 12 green wad
This subject has been passed around for a long time. I won't get into all the physics but if you don't mind load up 19.5 grains of green dot in a 1 oz load and shoot 100 rounds with it. Then try the promo load the next time. Tell me if you yourself feel any difference?? The green dot load won't work very well when it gets cold unless you keep the shells warm. It wasn't designed for 1 oz loads but it will work. I shoot it all the time .
Thank you to everybody for your help . I have been shooting 16 grains of 700x in win and sts hulls with 8 or 8.5 shot 30 yds or closer targets.Hits hard with little recoil. I realy like it. For longer shots in sporting clays i use 18.5 grains of 700 x in fed gold medal with 12so wad with 7.5 shot. Alittle more recoil but still pleasant to shoot. Thanks again Bigbob