Finding a second hand rifle has nothing to do with the discussion, at least to me it doesn't. The fun part of a project like this is having a rifle built to my specs if I can't find a new version that suits my needs.
Sorrty, but that isn't in the message you originally posted. Those rifles are of current manufacture.
Does anyone CURRENTLY make a rifle in either of these calibers?
Here is a new one...
https://www.sportsmansoutdoorsupers...-action-rifles/of3/17-REMINGTON-FIREBALLRemington is not CURRENTLY making any rifles in 17 Remington. And the last link you posted clearly states it is no longer available
Are you WRITING an article or LOOKING for a rifle?