I have two of the Wolverine series rifles... and LK-II and a LK-93. Both have the short barrels.
With #11 caps for get the sticks. Especially the APP stick or Jim Shockey Gold sticks. They require a large blast of heat. That found in a 209 primer. Instead I would go to a quality loose powder like Triple Seven, Pyrodex RS, or Black Powder. If you want to shoot APP get it in 3f or perhaps some 3f Pinnacle or JSG.
My rifles have a 22 inch barrel. Therefore anything more then 100 grains of powder is wasted. Altough IMO I think even with the longer barrel rifles, anything more then 100 grains is often wasted. Here are some loads I have been shooting.
I have been shooting my Wolverines for the past couple days.
this was yesterday. I also shot some APP 2f. This load was no indication of what the rifle can do. And I am sure that if I experimented with the powder charge I could get even better accuracy with them.
that flier I have no idea why it happened. Other things that shoot well out of the Wolverines are the Shockwaves. I want to try some 200 grain Shockwaves next week out of them to see how they do.
the 375 grain is an all lead bullet that is made for large game. I would think that if I tried perhaps 80 grains of powder it might stop that stringing.
Another good load here. We can not use magnification in our scopes, so my one wolverine has only a 1x scope on it.
this might give you some ideas. So with the #11 caps, go to loose powder and remember, with APP or JSG be sure to compress that powder charge real hard.