Recently I picked up 500 215 grain RNFP bullets from Matt's Bullets to be loaded into .44-40 cartridges. Matt uses Carnauba Red lube, which works great with smokeless powder. However, it's not compatible with black powder. So, I specially ordered this batch of bullets as-cast. I.e., unsized and unlubed.
My home cast bullets were lubed using a 50/50 mix of beeswax and mutton tallow. This is a great BP lube. However, my brother offered me the use of his RCBS Lub-A-Matic sizer and tossed in a couple sticks of SPG, a commercial BP lube.
The bullets from Matt's are similar to those I cast in the Accurate Molds 43-215C but with a slightly shorter ogive and the groove doesn't hold quite as much lubricant. However, it should hold enough, especially for my .44 Henry-equivalent loads (~28 grains of BP instead of 35 grains), or for shooting from revolvers. Rifles with barrels over 20" need more lube to prevent the bore from developing a hard fouling ring in the bore near the muzzle. It's less of an issue with carbines or revolvers.
Compared with my home mix, SPG is a lot softer. I was working out in my shop with the temperature in the uppers 80s and using SPG was messier than I expected.
BTW, I've placed several orders with Matt's Bullets over the past few years.. He's a pleasure to work with who delivers a top quality product. Unlike most commercial casters he doesn't make his bullets from hard alloy. Rather, he chooses alloys suitable for a particular bullet's application, which often is relatively soft. This often results in less leading because the bullets better fit the bore and so don't experience gas cutting.
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