I have toyed with this idea for a while. I am torn between the 450 or 470 so I would like to accomodate either. A couple of questions for those of you who have undertaken this work. Which action did you choose as your starting point and why? Are there some less well known actions that provide the required strength but cost less than the name brand actions?

Thanks,
Eric

Greener 12 Gauge action
- often seen around as the Empire.

Plenty of crap Greener Empire shotguns around that can be purchased for "not much".

Huge Lumps, Long Bar, Cross Bolt.

Can take up to 577 that has been done.