It only gets worse with age. i actually woke up at 4:30 this morning, because there is a gunshow in town this weekend & Ed is there with 4 tables and 250+ barrels laid out, all nice and i can hear them calling me...
The .45-70's i have had were accurate enough to benefit from higher magnification... mine are easily 100 yard + guns, and 100 yars is long way to my eyes when using non-magnifying scopes.
I prefer to use 3 ring mounts on my larger calibers. I like the millett all-steel weaver style bases, using 3 rings, on several big bores. Works great. The SSK mounts which are great but a little pricey, i use the TSOB on my .358 JDJ. Also have a couple of Redfield 3 ring setups on my .445 supermag pistol & carbine.