Significant drop in FPS with suppressor?

[WKR]

I have a feeling I am not guessing.

Maybe your right, I don't have enough personal field data on the matter to have a definite answer. And I dont have time to build two identical rifles with different twist rates to get results.
I've read that it effects MV and that made sense but if you can prove that to be false im all ears.

 

[Jkuhn22]

I don't have an answer for you, following along as I also have a Speed in 300WSM so I'm curious. I'm surprised you found a direct thread can for that goofy M13 thread pitch though.

Silencer central has the direct thread adapters for the M13 pitch.