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I was trying to load 18.5 gr of Promo in an STS hull with a windjammer wad and 1 1/8 oz of shot and kept getting sunken crimps. Talked to Ben at Alliant about using a 1 oz Windjammer wad and he said that it would ok. Has anyone tried this? I did't know if the shot cup won't hold all of a 1 1/8 oz load made any difference.
I remember many people using a 1 oz wad with Titegroup 1 1/8 loads.
Thanks, Gary M
 

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Hi Gary, not sure why the sunken crimps. I use 18 grains of promo with 1oz shot and various wads and I use STS shells. I don't have sunken crimps. I use a mec press. I just loaded windjammers last night for the first time and the crimps are good. You might check the wad pressure settings and crimp depth settings if you didn't already. Good luck

Mike Sudz
 

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You can also try setting the crimp starter a bit lower. You might have to reduce or eliminate wad pressure and adjust the crimp die as well. Sometimes a little tweaking will get the crimp right. You can sometimes get away with substiting a 1oz wad, but exactly what effect it will have on pressures is unknown, unless you have the facilities available to test it. As far as the shot cup is concerned, the 1oz shot cups are usually shallower than the 1 1/8. That may or may not leave an amount of shot exposed to contact the barrel. It would likely not make that big a difference by itself. I was one of the people that used the Remington TGT12 wad in place of the Fig 8, as recommended by one powder manufacturer. I saw no real difference in patterns or performance. I only have the word of the powder manufacturer regarding the effects on pressures. If the pressures listed in the data are towards the upper limits of my "Comfort" level, I don't make substitutions. My "Comfort" level is considerably lower than the maximum SAAMI pressure guidelines.
 
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