I recently got my 300 Whisper built and plan on using it for deer season this fall.
I have a 8.5" Bartlein barrel which I believe is 1-10 twist (I know .. no heavy sub loads). I will also be pushing the bullets through an SAS sound suppressor.
In MO .. yes they are legal as of now. Our law just got changed last year to allow silencers .. and if we get an influx of asshattery .. I'm sure the Dept. of Conserv. may change the rules .. but as it sits .. we are good to go!
Asshattery, LMAO. Suppressors SHOULD be legal for hunting everywhere. I haven't shot any game yet, but 125 gr Nosler ballistic tips shoot well in my rifle, and that's what I plan on using for pigs.