What is the advisability or using homogeneous bullets in double barrel rifles w/ solid joining ribs?

I've seen comments advising to avoid bullets such a Barnes-X because they do not swage down in the barrel and actually cause the barrel to expand (?) in passage. This expansion can break to joint (soft solder) holding the barrels together.

I have a 1907 vintage Joseph Lang cal 450/.400 31/4 inch and a 1922 vintage Jeffery cal 9.3x74. I'm using conventional lead core bullets in each pending input on 'usability' of mono-metals.

Any advice will be appreciated.

I don't know about the issue you raise regarding barrel swelling/solder failure, but it seems like...well, I'd rather have a sister selling tricks than a Lang double shooting X-bullets. JMO