Something to check with Shockey Gold.. When your shooting it, look (from an angle) into the muzzle and see if you spot a white chalk like substance building up near the muzzle. That is probaby making the hard loading. And you can normally just swab the first couple inches of the barrel and the rest of the barrel will load fine.
What Cayugad said. The same is also true of Goex Pinnacle.
JSG and Pinnacle like a tight fitting sabot that is seated very hard on the powder.