I cast a few more 170gr from my 309-170 Lee mold today (My second casting session). What is starting to annoy me is that the bases are not perfectly flat and have a raised bump left after cutting the sprue. This makes it difficult to keep the checks on straight. Any ideas on what could be going on? The sprue plate doesn't seem to be loose and I am letting the alloy cool every 10 seconds or so. I'm casting with a thermometer as well.
Should I just not bother with Lee molds for rifle bullets? Haha. So far, even a mold that has oil or wax in it, has been easy to degrease, clean, and store with just a couple of castings and I'm afraid that nicer molds will be relatively cumbersome and expensive to deal with. So far, the most reliable one has been the 459-500-3R, casting consistent weights and diameters for me but my newest 309 molds (309-170 and 309-2300-5R have been so so).