Back in the late '70's - early '80's I worked part-time at a gun shop. I faintly remembers the ScopeChief as being a top line model. My curiosity now raised, I pulled out some old Gun Digests, Shooters Bible's and a couple retail catalogs that the store used back then (yes, I'm a pack rat
).
My old catalogs only date back to the mid-1970's, with the exception of a 1962 editon of Shooters Bible. The ScopeChief line is listed in that book. Among its features at that time is an aluminum alloy one piece tube-turret construction and cushioned lenses. It retailed from $39.50 - $69.50. The only other scope listed in the Bushnell line was an "All-Purpose 3X9", which retailed from $69.50-$79.50. Thats quite a bit of money back then!
From what I can determine, during the late '70-early 80's era, the ScopeChief is listed as Bushnells first line scope, with the Banner running a close second. There was two models of the Chief; a IV and V. The ScopeChief V featured a "Lite-Site" lighted aiming point, powered by a compact long life battery and was available in 1.5X-4X; 3X-9X and 4X32. The IV model featured the "New Multi-X Reticle" along with the standard cross-hair reticle and was available in various magnifications from a fixed 2.75 to 3X9. Oddly, the obj. lens diameters ranged from 21mm (2.75) to 38mm (3X9). (from 1976 Shooters Bible)
Interestingly, The 1978 Issue of Gun Digest features a scope comparison. Upon reviewing the Scope Chief line, they mention a "new" feature called the "Rangemaster" which was later changed to "Bullet Drop Compensator".
The last listing I can find for the ScopeChief is the 1990 edition of Gun Digest. At that time the suggested retail price ranged from $189.95 for a straight 4X to $367.95 for a 4X12.
The 2 1/2 X 8 is listed at least back to 1976 but not to 1962. In 1988 it retailed for $189.95.
As long as the scope is functioning well, it would probably do well on the .243. You may to place a call to Bushnell and inquire if they would take a look at it and perhaps give it a tune up.
I hope this helps.