I have a Lyman 225438 that I used for the first time this weekend. I had a number of bullets that the base did not completely fill out. I was using two molds at the same time. The other was a Lyman 225415 and the bases filled out nicely. Both are 2 cavity molds and I was using straight WW. I'm puzzled why one filled out nicely and not the other. I have the small Lee pot that holds about 4 pounds of lead and filled the molds with a ladle.
Is this a problem with the mold, or do I just need to add a little tin. I have some monotype that is supposed to have more tin. If this would work, how much should I add. Or..... since the 225438 is a gas check mold, would this affect the bullet once the checks are in place.
I've lurked here for quite some time and have gleaned a wealth of information from the members here. Thanks for all the help you have unknowingly given me in the past and I hope you can help me here. Dale