I'm preparing to reload for a new M&P 9mm CORE. Are there any particular bullet weights or shapes that feed better or worse in the M&P ?
There are many option for 9mm lead bullet shape and sizes namely 115, 125, & 147 gr. weights configured as round nose [RN], cone nose [CN], flat point [FP], or semi-wadcutter [SWC]. I'd hate to roll the dice and buy several boxes of 500 bullets then have feed problems.

You'll never go wrong with round nose. I've had some feeding problems with TC ( trunciated cone) in a 9mm 1911, but it didn't have a ramped barrel. The M&P will probably feed most anything, but you may have to play with OAL with some of them. I have a whole bunch of RN on hand, as well as molds for both RN and TC to cast my own in 125 grain weight. I'm sort of itching to try some 147 gr. FP, but haven't gotten around to loading any.

I've shot lots of 9mm LRN, Bayou Bullets out of several different guns including the wife's M&P. 124gr, no issues with smoke, lube and they are priced right.

Since most 9mm were designed to use round nose bullets, you wouldn't go wrong with buying RN. I would try different shapes, but keep SWC for the last try (and just buy a few). I have 124 gr. RN lead, 125 gr. FN Precision, RN Berry's. and I cast Lee 125 gr. RNFP that shoot well in my FMK and Tokerev...