John,

I had similar issues but with different weights… I found nothing between 145 and 175 in field points.

However, I did find that there are these 5 gr. brass washers is 5/16 and 11/32 diameter that fit nicely on 8-32 threads for screw in points.

But adding the few to a 145, I got the 160, same with 175. 3 Rivers and others sell them.

Unless you have a lathe to turn down your own from heavier, all I found was 100, 125, 145, 175, 200, 225, 250 and 300 gr. field points.