The question is not if he should doo it compared to a 416 br, he already have a rigby in 416.

He want a double rifle in this caliber, and have a 500/465 that could fit nicely with an extra set in 500/416. I know very well what H&H would charge to make this, but this is not the question. It is about the pressure, in 500/416 compared to 500/465. will the 465 stand the proof of a new set of barrels in 500/416??