50 cal gas checks

[RiskyBusiness]

I want to get back into tinkering with the beowulf and want to try gas checks to see how well they perform with my pc boolits. I'm looking at sages outdoors but theres several 50 cal gas checks to choose from. Since I'm working with the lee bullet of 440gr .501 should i get the 500 s&w check or the sr/lr gas checks for 50 cal?

[Sandspider500]

The 500s&w gas check is what you want. The others are for a larger shank.

[TKM]

What he said. Good bit of kit.