Re: savage btc ss thumbhole?
If you go to savagearms.com you will get your answer. I own two Savages, one is the Mod 12 Low Pro varmint and the other is a Mark II FV in 22lr. Both are very free floating. I've not tried it, but I'm willing to bet I can get a credit card to the barrel nut. They are very open. Both shoot sub MOA if I do my part and have a good load for my heavy rifle. My 22lr shoots PMC very well.
"Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it.  But small is the gate and narrow the road that leads to life, and only a few find it.
If you find your self in a fair fight, your tactics suck!- Marine 1st Sergeant Jim Ryfinger
Friends don't let friends develop canonitis!
arguing over the internet is like the special Olympics....even if you win, you are still...special!