What does their #3 measure at the muzzle? I've got a #3 Lilja that is more or less sporter weight. Measure .625 and the muzzle. Works well, but if you plan on doing a ton of hiking with it, I might consider going to a #2.

"For some unfortunates, poisoned by city sidewalks ... the horn of the hunter never winds at all" Robert Ruark, The Horn of the Hunter