Re: Savage 10FP or 10FP-SR or 12 FV??? .223
I've got a 12FV in .223 with the factory 26" 9 twist barrel in a BC A2 Medalist stock, and a 75gr Hornady HPBT over 24.0gr Varget puts 5 shots into a .465" group at 100yd...and that's with very minimal load development and me being a lousy shot.
That said...if you want a longer barrel go with the 12FV, if you want a shorter barrel go with the 10FP, if you wanted it threaded for a can go with the -SR.
A new stock and maybe a new trigger (depending on how you like the accutrigger) would be the "best" upgrades for shootability, in my opinion.