I have a Wolverine in .50 cal. I bought new in '91 if memory serves and paid around $200. It was originally configured for #11 caps then converted to musket cap and finally this year to 209.
As for specifics, I'm not sure what other info you might need but I can tell you mine shot best with ~90 grains Pyrodex, did not like pellets with the exception of Pyrodex before conversion to 209 and still manages ~1" groups @ 100 yds. with a 250 gr. Barnes with a 100 grain equivelant (2 pellets Pyrodex). IIRC the max. charge was 120 grains, the trigger is a Timney copy, Green Mountain barrel and current value is probably less than $100.
While I've fired a few nicer models including my mother's MK 85 and my father's TC I see no reason for an upgrade unless your distance extends beyond 150 yds. To me it is an undervalued, beautifully simplistic design that lacked nothing.
A few side notes if I may; mine may be wearing its original configuration next year due to problems with ignition this season. I had 2 Winchester primers (their muzzleloader specific ones) fail to ignite. The first had 5 strikes and no ignition, the second took 2 strikes to ignite. Due to timing, I was unable to test the new configuration preseason so I cannot validate whether the issue was related to the rifle or a bad batch of primers. I can confirm that the same batch killed 3 other deer in 2 other rifles without issue. The trade off was a split second delay in ignition when using pellets. The other issue with 209 for a Knight are those pesky primer carriers. Prying the first off was difficult at best and cost me the deer I wanted. The other issue of course is parts availability with a new company having bought the rights to the Knight name.
I think you'll enjoy it and I've yet to hear of a Knight that wasn't a good shooter.