Northwest Custom Projectile offers a .308 cal. aluminum tip/rebated boat tail bullet....Has anyone had personal experience w/these...they claim a G1 b.c. of .725 ..it looks slippery but sounds kinda high for 180 grns...are they accurate? would this type of bullet construction work well on big game? and is their b.c. just b.s.?....they make no mention of the velocity this bc is acheived..and its not specifically touted as a hunter