SWEET...REALLY SWEET...take this to the bank: any, ANY good 200 gr. LSWC, H&G #68 look a like, with 5.1 gr of 231 will really tickle your fancy! Very rare to find one in that condition...shoot it...and for gosh sakes, report back!! Disregard any and all comments about shallow rifling not suitable for cast lead alloy bullets...it'll do fine....too...Starline will ship you .45 Auto-Rim cases in bulk.
I shot mine yesterday, with 75 yo eyes doing the steering and easily got 1" gps at 10-12 yds from a two-handed Weaver stance...you should be able to do better. Mine, BTW, is a Ca ~1970, version of the same gun.
Congrats on an excellent find. Rod