RE: Black Mag3 vs. APP
I've shot a lot of rifles and the one thing I have learned is there is no way to judge what one rifle will like. I have four Renegades. One of them hates conicals of any sort. One of them shoots any conical or sabot I shove down it. I have yet to figure this out. The others will shoot about anything although they shoot roundball better then conicals.
Same with inline rifles I guess. Although most of them have a 1-28 twist, some like the light bullets and some like the heavy. All you can do is try different combinations until you find the one that rifle likes.