I'm very happy to say that you are not correct with regards to muzzleloading in NJ! I belong to three shooting clubs that have black powder leagues or their only gig is black powder. Shooters from several surrounding states come and have fun competing in our sport.
Although our gun laws are draconian, there are exemptions for almost every legitimate shooting sport or competition. It's the little-known exemptions that provide us with a vast array of shooting possibilities! From AR-15's to black powder muzzleloading, it's all here, alive and well!
If you're planing on coming to NJ to shoot, give me an email and we'll fill you in on all the fun you're missing! Check-out one of my club newsletters via the web site:
www.oldbridgerifle.com . The calendar, newsletter and links to some of the wildest action disciplines on the east coast!
Dave