Thanks, Bart---You hit right on what I was thinking. If the harmonics change due to the added mass of a silencer, then perhaps a new load would have to be developed? I normally enjoy that kind of stuff, but right now, the components are in short supply, and I am really limited on the powder that is good for this gun.
I guess, considering that it might take 6 months to get the paperwork handled (or a lot longer) that powder might be available to us loaders by then.
Thanks again for your comments.