This one is for Techshooter, but others feel free to provide input. I have a 22BR on a Stiller Predator with a local (NZ Hardy)) Np 4 contour match grade barrel with 1:8 twist 6 groove. I've been reading up on accuracy nodes. Looks like there are three variations to the "ladder" technique to find the accuracy nodes: 1) Dan Newberry's Optimal Weight charge technique. http://optimalchargeweight.embarqspace.com/#/ocw-test-example/4529811475 Dan uses group size and position to pick the sweet spot 2) Chris Longs Optimal Barrel time theory http://www.the-long-family.com/OBT_paper.htm Soundwave theory...makes sense but looks difficult to calculate accurately without pressure trace. 3) Steve Laurence technique where he looks for the minimum velocity spread. See 6.5 guys vid http://www.65guys.com/load-development-part-2-of-2/ As I have a 100m range at home, I want to try Steve's technique that relies on the velocity plateaus and minimum velocity spread to identify accuracy nodes as velocity is independent of the distance I'm shooting and a ladder test at 100m has too many overlapping shots to be easily interpreted. I've just shot 11 x 5 shot groups from 29.9-32.9g on 0.3 g increments and here are the results: Hmm having problem getting a readable image of my chart and this site wont let me upload the xls file. My confusion is that the tightest groups are where there is the largest velocity spread, which is the opposite of what I was expecting. I've modeled the load in Quickload and had to do quite a bit of fudging to get it to match my range velocities. Chris suggests changing the BA value and projectile weight to fudge QL to get it to match range velocity, but changing the BA and projectile weight only move the velocity up or down but parallel to standard values. The only way to vary the gradient of the velocity line appears to be to change the cartridge weight factor. I had to change this from 0.6 to 0.2 to lift the gradient of the velocity line to match my range velocity. Once I got a reasonable match I calculated the OBT nodes, which I've added to the chart. Node 4 is pretty close to one of the velocity plateaus, but not where I shot tighter groups. Node 3 is also close to a marginal plateau but these OBT points are not really showing good correlation with my ladder test. So where do you suggest I do further testing for my accuracy nodes?