I have the lite weight version of that .45 cal RNFP. I think it's 160-grain. It works well in my 1911. I'm using wadcutter magazines. If you don't know what those are, look back in some of the older posts. You should be able to find pictures. If you can't find them, let me know & I'll troll through the old posts for you.
Edit:
Post #5 of this thread shows the difference in a wadcutter mag. - http://castboolits.gunloads.com/show...ight=wadcutter