I'm not a huge fan of the 429348. I suspect that two-diameter bullets are rarely as accurate as full-length wadcutters - at least that has been my experience - and I have found that this sort of "wadcutter-with-a-nose" needs to be driven harder than does a true wadcutter. I've even seen some evidence of key holing when using the 429348 with minimum loads.
I suspect the bullet may have some use as a "defensive wadcutter", for those who are interested in such things, but purely from an accuracy standpoint, I would stick with the more traditional WC design.
As for seating stems, I just grind one off flat, which is the easiest and quickest way I know of.