I'm a sucker for SXS's, rifle or shotgun. Exposed hammers aren't a must, but they are certainly a plus IMO. Never seen Gunners 303, but if it's anything like this one:

http://forums.nitroexpress.com/showthreaded.php?Number=151076&page=3

It's about the perfect double rifle in my mind. If that one was back on sale today for around the same money, it'd be mine.

“Life is life and fun is fun, but it's all so quiet when the goldfish die.”