Not having much luck with the 178 ELD-X in the Remington TAC 21 20" 1 in 10 using 42 and 42.5 GR of 4064 with the 178GR. I am however having good results with 43.5GR of 4064 with when shooting the 168GR. It has been suggested I try the 43.5 - 44 GR of 4064 with the 178 GR. Anyone that can give some input would be great. These red pasty's are .750". I do not have a chronograph so I have no clue what my MV's are. I just need to shoot good groups at 100 so I can feel good about it not being the gun if and when I miss as greater distances. I'm hoping this statement means ( knot cutting combination) [ all in the same hole ] at 100 yards with ~44 gr of IMR-4064 as I have read elsewhere. Sure wish when people made these claims they show photo's of their actual accomplishments.