On topic,
this was my 7mm RemMag Ruger M77 Mark II
converted to .416 Taylor.
I have tried the .416 Ruger feed-dummies in it and it seems to be good.
No surprise.
I leave it as a 26"-barreled .416 Taylor for nostalgic reasons,
especially since I have one of those new-fangled 20"-barreled Ruger Hawkeyes,
and a 24"-barreled Ruger No. 1, both in .416 Ruger.
Who needs a .416 Rigby if you have a .416 Taylor or .416 Ruger ?
Oh, yeah, a nostalgiac.