Your trajectory estimates should be real close. My son's Apex using 130gr of pellets and a 250SW hits 2" high at 100 and about 2.5 to 3" low at 200. You should be good for anything up to at least elk size with that load. It still has over 1000fpe out to 225to 250 yards, maybe a little more with the 150gr load.

Good luck with it.