The Hornet case OR the 223 case would be a bit of a problem to fit an ejector and extractor in the Marlins...BUT...for those that really want a varminter any small cal on the BR or PPC cases would be just a re-barrel as the base is the about the same size as the 3030 AND there are a few wildcat using the 30-30 and 225 Win cases, like the 219 Zipper of old.
There are some very simple ways to get a small bore levergun and some very complicated ways, but it can be done if you don't mind paying the bucks.
I keep looking at the 22, 25 and 6.5 BR for a swap barrel on my 336.
As far as accuracy goes there are ways to make a levergun shoot as good as a bolt gun, just not as high a velocity because of the pressure limitations.
LUCK
