Ok, Im going to cut to the chase here ( I have been doing this stuff a long time). If in any 30" rifle barrel you are fouling out, You need either another bullet design or a different lube. It is tough to get enough lube in many of the "off the shelf" bullet molds from lyman, Lee, RCBS, and others. Rapine does better than most with correct lube capacity from their molds. However, All is not lost. Believe me there is a tremendous difference in Bullet Lubes. SPG is not the holy grail. Buy and use Lee Shaver's Black Powder Moly Lube. This stuff is great. and works well in many of the Lyman molds. YOU DO NOT WANT TO USE GREASE COOKIES!!!! They do nothing but retard accuaracy. Yes, the old buffalo hunters and original sharps cartridges did use cookies, but this was in 45-90's to 120's and these hunters often shot until you could not touch the barrels. I have shot 45-70 using Elephant or Swiss, or Goex powder and a Lyman Postell bullet a hundred times without wiping or cleaning in any way. Just "blow tubing", using Lee Shaver's Lube, and weighting for the gun to cool. Let me repeat "YOU DO NOT WANT TO USE GREASE COOKIES!!!! I tried to make these things work for years always with poor results in accuracy. I know of no serious BPRC competitor who uses grease cookies in load development.