My friend and I were talking about groups and use of different powders. I had shot some different loads today and noticed that the groups were all over the place. So I went back and researched some range notes and came up with this conclusion. Here is an example. I have a Remington 700 SPS in 223. 1/8 twist 26 inch barrel. I have shot a lot of sub MOA groups with it using both Hornady 75gr BTHP and Sierra 77 grain Match Kings. So my thought today was why the spread in groups. Then I looked at my notes and pictures and it dawned on me. With the above two mentioned bullets I got nice groups at around 2600 fps at the muzzle shooting at 100 yards. So I was thinking well I will just look for loads with different powders that obtain a 2600 fps at the muzzle and see how the groups are? I feel the groups should be about the same size since everything else is. The only thing that will change is the powder. What do you guys think? Am I on the right track? I am trying to duplicate a load that I got with Varget at 23.3 grains on the 77 gr bullet. I noticed that I might be able to get the same group using AA 2520 at around 22.5 grains. I know I need to load some up and go to the range. Trial and error, right? But the range is kind of far from my home, and finding a load quickly would help. I might mention that I also got great groups using AA2230 at 22.6 grains. Just experimenting and trying to find loads that perfom almost like each other. My thought is that if the bullet leaves the barrel at the same speed or near the same speed, it should fly the same? And the groups should be very similiar.