Im sorry I haven't tried 100gr. bullets in mine . I have a 28"Kreiger on Rem 700 action. I settled on the 123 Sierra match kings. they have a .510 BC. with 38.3gr Varget, CCI Br4, with bullet Kissing the lands. pushing them 3,040 fps.at 10ft. with 1/4" moa. 37.5 gr at 2,985 fps also 1/4" moa...