jonk
07-21-2008, 08:53 AM
I scrubbed my Yugo M48A down to bare metal last weekend, including Eds Red, JB bore paste, and 2 different sorts of copper remover. CLEAN! This weekend commenced to try some cast bullets. 170gr FNGC from a group buy, quenched WW, lubed with 50/50, sized to .325, over IMR 4895- 5 each of 25, 26, 27, 28, 29, 30, and 31 grains, as well as 5 with 17 gr of SR 4759. For the 4895 loads I was using 2 grains (roughly) of polyester pillow filler- the famous dacron wadding I'm just getting into.
All loads shot pretty well with the best being around 28 grains- but none were bad and I got no signs of leading. All were seated just off the lands.
So I clean the bore- a few passes with a bronze brush and then Ed's Red. The main powder fouling came out quickly, the black stuff. Then though something odd; a brown fouling, slightly darker than rust, that wouldn't totally clean out. I'm at a loss. It isn't the color of your typical lead foulding (the gray streaks), it isn't rust as the bore was shiny and I ran a dry patch through before shooting and IT was clean. The pillow stuffing wasn't melted- I examined some of the tufts on the ground. I can't see a lube failure or there would have been leading, and there was a nice lube star on the muzzle showing I wasn't running out.
All I can think of was that the lube was somehow getting in pores in the metal- which would be ok- or that the pillow filling was somehow still leaving residue.
What do you think?
All loads shot pretty well with the best being around 28 grains- but none were bad and I got no signs of leading. All were seated just off the lands.
So I clean the bore- a few passes with a bronze brush and then Ed's Red. The main powder fouling came out quickly, the black stuff. Then though something odd; a brown fouling, slightly darker than rust, that wouldn't totally clean out. I'm at a loss. It isn't the color of your typical lead foulding (the gray streaks), it isn't rust as the bore was shiny and I ran a dry patch through before shooting and IT was clean. The pillow stuffing wasn't melted- I examined some of the tufts on the ground. I can't see a lube failure or there would have been leading, and there was a nice lube star on the muzzle showing I wasn't running out.
All I can think of was that the lube was somehow getting in pores in the metal- which would be ok- or that the pillow filling was somehow still leaving residue.
What do you think?