Looks like you're good to me proof-wise, but what is the wall thickness?

https://www.vintageguns.co.uk/magazine/proof-sizes

I have shot a few rounds of very light factory loads in my 2.5 inch chambered damascus barreled SLE as an experiment. No noted adverse effects, although I wouldn't call myself comfortable with it. Also bores are at .732 as proofed (or near) with .030 MWT.