I've read and read and read....and most feel anything over 1500 fps requires a gas check, and some put that figure much closer to 1000 fps. Others however, say they have driven cast rifle bullets up to and even over 2000 fps with the proper alloy and the proper size bullet.
I have a setup to reload cartridges with cast bullets at 45-70 velocities without gas checks, but I wish to purchase a 500 gr mold that will cast bullets that will be driven at closer to 2000 fps in my 458 win mag. Do I really need to get a mold with a gas check?
Gas checks just kind of rub me the wrong way....go against most of the things I am trying to accomplish by casting bullets rather than using jacketed, so I would sure prefer to go with a plain flat base.