....using the loading data on the can for 158g .38sp, 3.8 grains over a small pistol primer. Out of the psitol (6" dan wesson) they shot fine. Out of the Timberwold (18" barrel rifle), starting with the 1st round more then 1/2 of the 20 rounds squibbed. Is this a pistol only powder?? Wanna kill these ads? We can help!