I run the CCI CB longs in my beat up Marlin 39A "Garden Gun", with a view towards avoiding the dread Carbon / Lead ring induced in a L.R. by the Shorts variety.
That said,....the Shorts always seem to have the accuracy edge over the longs. What I've taken to doing with the Longs is raising the muzzle to 90* after loading, and maybe settling that miniscule pinch of powder more uniformly over the priming.
That trick's results seem plenty accurate enough to deal with the big ole Ground Squirrels here........very effective in terms of lethality pronto, too.
My 28" Winder Musket remains in it's original .22 Short chambering in a slower twist barrel. The CB shorts will just flat BUGHOLE outta' that one.
SHHhhhhhhhh quiet, too.
GTC