Hello all, hope everyone had a great Thanksgiving. I'm new to casting muzzleloader bullets. . .have plenty experience with centerfire handguns and rifles, but starting to take an interest with my sidelocks. I'm going to place an order with Tom over at Accurate Bullet Molds for three new molds. Two for my .44 Mags and one for my muzzleloader. My question is; I have read conflicting articles and forum threads in regards to the lube grooves and obturation of the bullet - round vs. square. . .and which is prefered/why? You guys that are in the know in regards to this subject please fill me in. Thank you very much.