I pulled the stock off my 6.5 Creedmoor today to put a Boyd's stock on it and in doing so I noticed what appears to be a small amount of unburnt powder in the groove where the recoil lug sits. It's in the threads and I'm not sure how it ended up there. The only spherical powder I use is BLC-2 so that's what I'm assuming it is. Has anyone else seen this before? Im running under Max charge but obviously it's not burning all the powder.