Mike

Thank you for the video.

Those ex-Rook Rifle .410s make lovely small game rifles when re-lined, but bear in mind that they were built for low pressure cartridges and that the stocks can struggle with recoil as is sometimes seem when they have been opened out to .410 3 inch.

Would not .25-20, .32-20, .32 S&W Long or .38 Special (very similar to .360 No, 5) be closer to the original concept and put less strain on the gun?

Congratulations on your finds,

Parabola