I have a couple of them.  the B's were intended for rimfire rifles, probably the least expensive Weavers.  My B 6 was on my Marlin 39 A bought used in 1962  Looking through it now wonder I ever hit a squirrel. I can't recomend them for use today. There is a lot better out there.

The K's however can be nice scopes.  I have a K 8 thats adjustable objective and has a good sight picture. It's pretty long too probaly 14 inches. The negative on K's is the adjustments don't click.  Used they are not particulary expensive I would probaly sell that K for less than 50 bucks on ebay At fixed distance it's a good scope.  K 6 a bit more as hunters like them.

The Weavers you want are T's good optics adjustable objective thats precise and the best windage and elevation adjustment of any internal scope. Micro Track and when you click it it does what it's suposed to do.  Ony thing the suffer from when compared to a Leopould is coated optics and they are not sealed.  Not a big negative on the target range.  Aftermarket bost and custom reticules are readaly avalable for T's  They are sought after used. I would put the price on a 10 at 250 or so with a 16 bringing more

I have a number of scopes on offhand rifles Leopolds Lymans Unertils etc. and think a T 16 Weaver is as good as it can get

Boats

Old B6 Weavers were not in the same league as target scopes, but remember, the old Weaver 330 was used as a sniper scope on the 03 Springfields, and worked well!
The optics of a B6 were no different than the other Weavers of that era, including the 330. They used lenses provided by Bausch and Lomb, and when they are clear and clean, they will work fine as a small game scope, and are pretty rugged when it comes to recoil.
For what you plan, the B6 will be fine.-Vall

Looks aside I gave the "b"s up for  squirrel hunting with my old Marlin 39A  The optics are just not good enough for me.  As far as the 330's on 0303's they did  use them but if you look at the old reports nobody had anything good to say.

I am using a KT 6 Weaver, Old steel tube scope with micro track adjustments under a hunting turret on that rifle now

My modern T/C carbine squirrel rifle carries a Leopold compact 3x9 A/O that has had target knobs added.   

The marlin/weaver outfit will outshoot it.  on a bench or at a match perhaps not, but in the woods it's better for me anyway.  It's a subjective choice I guess


Boats

Weaver also made a 7/8 tube scope that was the 'J' series AIR, and I believe they may have had some other 7/8" models as well. These were a significant improvement over the 3/4" models.
ttfn, Joe