OBT to MV Speadsheet

[BD1]

So I looked up CBTO and read the definition on the Berger website. I determined the ogive by setting one caliper to .243 and sliding it down the nose until it just started to bind a bit and then measure that distance to the nose with a second caliper using the depth rod. I subtracted that measurement from the COAL to get CBTO. Using those numbers in the OBT spread sheet gave me mixed results. The best groups using LVR under the 105 grain Bergers fell in the predicted node 7, But the best groups using Varget under the 107 SMKs fell outside of any node, (between 7 and 8). So at this point I would say that my feedback is "indeterminate". My rifle has a Little Bastard brake and a Little Tuna barrel tuner on it. These things are large and it seems like they must have an effect.