The only real improvement you can get out of it is going to a
50 Alaskan in a Marlin G
There in it self is a bigger story i found one gunsmith willing
to over bore to 50 cal that wont take a year to do it

Here's his reply to my email..
Martin, cost of a rebore/rechamber is usually $265 plus return freight. At this time I don't have the 50 alaskan chambering reamer. I could still bump up the barrel if you have someone that has the reamer.
Dan
dan@cutrifle.com

If anyone once it done theres the spot

Pottsy