I have never loaded for handicap, only 16yd and doubles using Red Dot. Always used new stuff for handicap. Would Green Dot be a better choice for 27 yd. handicap loads ? Load would consist of 1 1/8 hard 7 1/2`s in old style AA or new STS hulls.
It really depends on how fast you want to go. Under 1200 fps, Red Dot is usually OK. Green Dot is a good choice up to near 1250 or so. Universal Clays, Unique, PB, or a host of other powders are also quite suitable. The idea is to get a load that attains the velocity you want without too much pressure. I usually try to stay between 8500 - 10000 PSI. 9000 - 9500 is my target.
I've had good results with Green Dot and the Downrange Red Versalite. Remington Figure 8's have done well also. Winchester or Remington Primer, around 19.5 - 20.0 grains of Green Dot will usually do the trick in the STS or Win AA hulls. Double check the data with your exact components before loading.
I would suggest Green Dot for handicap loads. If you spend enough time at a pattern board, the slightly tighter pattern produced by Green Dot will become apparent. But, it is not possible to convert the tighter pattern directly into a higher score. It is possible for a target to slip through the center of a 40 yard pattern and Green Dot will reduce this possibility. Green Dot will average 6-9 more shot in the center 20 inches of the pattern. My guess, and it is based on nothing factual, is that Green Dot could result in something like one more target out of 1500. If my guess is correct, Green Dot could mean the difference of hitting or missing a Lewis Class once or twice a year.
I believe Green Dot is better suited to long yardage handicap. It's easy on the gun and likewise the shooter. There's nothing wrong with Red Dot but if I had my choice, I use Green Dot for handicap loads. Darrell
It would be terrific if my only misses were caused only by targets "slipping through" my patterns!! I'd rather have my eye intensity on the leading edge of the target tightened more so than my patterns! The best patterns possible can be negated by the TBA syndrome that a lot of us shotgunners have. PK isn't afflicted by that malady so he should use Green-Dot for handicaps.
I use Green-Dot for my handicap loads due to the slight increased numbers mentioned above by Pat though. Picking the correct wad is equally important for sealing efficiency in most of my trap guns too. Probably even more important if the gun has overbored barrels but none of my barrels have those.