I am thinking of loading subsonic 50 bmg. I have heard of a load using Reddot with 690 gr bullets. I wonder if Trail Boss is a possiblity? Any thoughts will be appreciated. Thanks.

I think trailboss says you can use 70-100% case fill for any cartridge out there, and I hear it's quiet. Only problems I can see are: Can you find trailboss? Is the twist rate fast enough to stabilize that bullet at ~1000 fps?

On gunbroker there is some Trail Boss in Abbevile, GA, and,

On 28 Oct: Franklin Gun Shop - Tennessee had one 5 lb jug for $149.99.