rebarrel falling block-type actions to different cartridge?

[boxhitch]

changing 45/70 to 38-55 maybe? are mods needed to the original breech block?
does rim thickness come into play or is that taken up in the chamber?
different extractor and barrel, is that it?

 

[iron cat]

changing 45/70 to 38-55 maybe? are mods needed to the original breech block?
does rim thickness come into play or is that taken up in the chamber?
different extractor and barrel, is that it?

Yes, I believe so.
I have had many falling blocks rebarreled to cartridges with different case head sizes with the extractors being the only issue.
Cat

 

[gunlaker]

I don't know of any that would need changes to the breech block. Extractor & barrel is likely all you need. Plus a decent gunsmith who actually wants to do the work which is the hardest part.

Chris.

 

[iron cat]

I don't know of any that would need changes to the breech block. Extractor & barrel is likely all you need. Plus a decent gunsmith who actually wants to do the work which is the hardest part.

Chris.

There are a few around in Alberta that I know of who don't mind working on falling blocks.
Henry Remple in Langdon, Paul Cook ( PR Precision, member here) and Wayne McDonald West of Edmonton are three that I trust with my falling blocks.
OOPS! forgot RKS in Torrington!
Cat

 

[iron cat]

changing 45/70 to 38-55 maybe? are mods needed to the original breech block?
does rim thickness come into play or is that taken up in the chamber?
different extractor and barrel, is that it?

This one went for a 45/70 DCRA long range target rifle to my main hunting gun in .303 Brit, barrel and extractor changed only as far as the metal work goes, the stocks of course were changed as well
Cat

 

[boxhitch]

good info, tfs