John - as to the solid web section of a Partition bullet creating extra hoop stress inside the bores, possibly damaging the soldering, would not the bullet be engraved at the breech end of the barrel and properly fitted to the grooves prior to the 'load' reaching full pressure anyway? This, of course, is due to the ctg. developing maximum normal pressures some inches down the bore, longer for slower powders, close for faster ones.

Loads developed for the bullet in question would not produce any more pressure than the person who loaded them, wanted them to produce. Once fully engraved, I cannot "see" how the hoop stress would be continual during it's trip down the tube - afterall it is then the proper size and not attempting to expand against the lands. It is possible the web of a partition bullet could cause a more rapid climb in pressure at the breech as the powder charges gasses expand, however that trend would be taken in stride with normal safe handloading practices of starting low and developing the loads from the start.