I used shotgun pellets in my setup this year to match my field points to broadheads. I am only to fit enough for a 10 grain weight change before I have to trim back the taper on my wood shaft, thus losing a bit of weight to gain a tiny bit more.
I bought some woody weights to play with later this winter. Very durable.
Dave, the woodies come in increments starting at 75 grains. With a zwickey delta, that would put you at 215 grain head weight. If you tamp (with a filed down nail and hammer) 4-5 #6 lead shotgun pellets into the ferule of your field points, and blunts, and do nothing to your judo's, then then you should have a matched set of points for any type of shooting.
Make sure you use a grain scale! Broadheads vary from their marked weight by up to 10 grains, and most don't know this, but you should already be tamping lead shot into them as well to match them on a grain scale, just to correct for manufacturing variance.