I say the bolt action rifle perk should increase RoF, reload speed and maybe small spread reduction.
The perk should still effect DAM because cowboy repeaters match the hunting rifle in DAM and the cowboy repeater has a way higher ROF(Cowboy Perk).
I like the idea but in general the perk could effect one handed semi auto weapons like the,9mm pistol since people who carried bolt-action weapons general have a semi-auto pistol with them as backup.
This could make the 9mm round more effective also.
Maybe make a new name for the perk maybe:
Old Time Soilder?
Throw some name idea if you want.