the 1/12 rifling is right, and the 180's are right at the edge of the envelope as far as the 308's are concerned- the bullet sits right on top of the powder at factory length settings- as far as the heavy trigger pull is concerned,pull the buttstock ( you'll need a LOONG screwdriver after you get the buttplate off and one of the screws is done up too darned tight- probably by someone who doesn't know 99s- too loose,and the lever flops around like a wet fish, too tight and she's a first class beast to pull- it's just aft of the magazine, and you'll find it by trial and error- and for gods sake , don't undo anything all the way- or it's a trip to the smith and not just anyone can work on 99s- I've got a 99c that I've had since 71 or so and the smith I took it to retuned it with a spring in a small plastic bag- claimed I didn't need it and he didn't know where it goes- well, about 5 minutes with the numrich catalogue and I located where it went- it was a magazine return spring-so much FOR THAT SMITH.
as far as value goes they're all oever the map depending on condition
the guy that removed the rear sight to mount his scope was a dumbass as it's easily done with a set of higher rings or in come cases like mine, the rear sight FOLDS down-THE LADDER just uses a higher ring- had it been me, I would have bought a folder type rear sight, or at least a blank for that dovetail as I don't like empty slots- the rear sight is adjusted with a soft faced hammer or hammer and brass punch from the RIGHT side