I currently build my 9mm rounds with 147 MW with 3.8 grains of unique set at 1.15 oal. this renders a load that is light to me but power factors out just under 125.

I have heard of others using faster burning powder but this seemed a little snappier than the slower burn of unique.

She was not a fan of the recoil impulse the second time but the first time she said it was tolerable.

if I go any lower I will need to switch to a 12# spring which is ok as well.

So whats the story with using a faster powder? I would think that the slower powder changes the recoil from a snap to a push.