Imarangemaster, I use the RCBS 115 grain round nose with a gas check. I used to buy checks when they were reasonable, but Hornady and Lyman got out of control with prices. I bought one of those Freechex tools on E-Pay and now punch and form my own out of beverage cans or chimney flashing.The pop can aluminum is a little thin(.004) so I use 2 layers. The flashing (from Lowes or Home Depot) is around .010. They work just as well as copper checks for a fraction of the cost. For casting metal I use straight WW metal and sometimes toss in some 60/40 solder as a little tin is all that is needed to increase the flowability or fillout ability of the melt. WW is somewhere around 9 to 12 BHN on the hardness scale; not really hard but not soft either. If harder bullets are needed then there are two ways to go about it. Add about 4-5 % tin (which is pretty expensive) and that would raise the BHN rating to around 22 which is what Linotype is, or water quench the bullets by dropping them directly from the mold into a bucket (placed lower down & behind you and the casting setup) of cold water. This will harden them to around 18 on the BHN scale. Sorry for my erroneous notion in my previous post that extracted cases continue to expand on extraction; I thought that was happening as some of my cases would not re-enter the chamber later after firing...and a thank you to Chris for correcting me with the right info/sequence. With the spectrum of calibers that you have been loading + your time and experience you will have no problem loading good ammo for the 30 Carb as soon as you get set up. Good shooting. JC