There are 4 different TAP loads because they're all different lot#s. The box velocities on the numbered ones state 2600 whereas the box velocity on the unnumbered one states 2610.
Gun is a 16" Geissele GFR with an Otter Creek Infinity suppressor.
Got a new Xero C2 the other week and chronoed some Hornady loads but remembered that it had been a few hundred rounds since I last cleaned the barrel and so was thinking that my velocities might be a little slower than they should be, so did a barrel cleaning and took the gun back out to get new data. Prior to cleaning I would be able to make POA=POI impacts x3 on a cold bore with my zeroed load before the groups started opening up due to heat (but still had tight mean radii). Well, today my cold bore shot was more than .1 mil high and more than .1 mil right, and the following 4 shots were also not close to POA. My groups didn't start tightening back up and landing near my POA until afterwards, but still not as accurate as before. I hope as I continue to foul up the barrel again my POI returns to my POA.
First 4 pics are examples of groups just prior to cleaning, the remaining 5 pics are from after the cleaning. I didn't take a picture of the first 20 rounds down the barrel because they disgusted me. The 8th picture with the 2 POAs, shot #1 was the first shot of the Mil-Match load after I had got done shooting a different grain weight bullet (some people say that when you switch grain weights and/or loads, the first shot can fly off, I don't know if I fully believe but looking at the cluster of 9 to the left maybe it's true?) But despite how tight the group is, it's still nowhere near my POA which makes me mad.