Yes you can load spire point bullets in a 30-30 case. I do it all the time for my Savage 340 30-30 bolt gun. Plus we use a Spire Point load as the first load in our lever guns.
150 gr bullet is a 150 gr bullet. I also load 30-30 bullets in my 308 for Brush duty.
mostly though I just load what ever bullets I got a good deal on.
Shoot plenty of pointy cast bullets from 30-30 too.
Notice I did not say it was a better load. You only going to get so much with a barrel band. But it will make that 1st shot a little flatter.