I've got around 200 pcs. of once fired, resized and tumbled Federal Champion 45 ACP brass that has the small pistol primer pockets......since I always seem to be unable to find a few cases after firing on the range I figured I'd just reload them till they all slowly disappeared. I'm not opposed to using the SP primers for 45 ACP but I just wondered for those that have did you use the same powder charge as you do when using LP primers and was there any noticeable difference in the accuracy, POI or velocity that you could tell ? If it matters I'll be using W231 powder and 230 gr. FMJ ball bullets in a M1911.