Hey bronco. Yes, I do record shot by shot velocities. They are generally pretty consistent. See the readings on the Harvester long sabot target below. That was a four-shot group because I had only 4 of those sabots on hand.

I usually shoot five-shot groups at 100 yardsyeoman. Sometimes I shoot at 50 yards when it's hot and I don't feel like doing a lot of walking.

I have a 3X9 Leupold on the Mustang (which I use for most of my experiments) and a 2X Simmons pistol scope on the New Englander, which was my "go to" ML before I got the Mustang last year. Lyman twist is 1 in 28".

The "volume equivalent" is derived mathmatically. A while ago, using my brass powder measure, I threw a bunch of 100 grain charges with each kind of powder I had and weighed them out.100 grains of T-7FFFG weighed 87.0 grains. So1 GV=0.87 GW and 1 GW = 1.15 GV.Therefore, when I'm working with weighed charges I just multiply it out to get anidea of the volume equivalent - i.e. 75 GW x 1.15 = 86.2 GV.