I have been given some 400 grain cast bullets that look like they are supposed to have gas checks. This one weighed in at 393grains. I as of yet don't cast my own and I'm not sure if I can shoot them at lower velocity or if I should gas check them. I don't want to go all out with sizing and lube press with all the trimmings just yet and was considering buying the Lee Lube and sizing kit to put gas checks on. I have attached a couple of photos so you guys can take a look at the bullet. I have been given several hundred of these and would like to shoot them. With the smaller diameter at the base for what I'm sure is the gas check, can I shoot them without or will there be a pressure/ heat leak past the lube grooves? Any advice would be appreciated.