I have a few rifles i want to start casting for and would like to check a couple measurements before trying different molds and sizers. 2 are military surplus bolt actions, a 91/30 mosin and a 7.7 arisaka. Not too woried about a pound cast with these as they are sturdy bolt actions but the 3rd rifle is a 1957 Winchester 1894 30/30 lever action and am worried about opening the lever after pound casting. The cerrosafe would be reusable in all 3 rifles but have heard even during the 30-60 minutes after casting the size is not true. I have slugged the arisaka with a piece of lead OO buck shot 3X and with 7 lands do not know if i am getting a correct measurement. I have a micrometer and dial calipers. Any recomendations on which would be better for a first timer they both seem a little scary!