There are a lot of variables there to look at .

The Chrony's are notorious for being off and all chrono's are sensitive to the light coditions . You want to set up and chrono in as close to the same conditions as possible with the light as close to straight above it . This way you can get some what repeatable numbers from them . You always want to take chrono numbers with a grain of salt untill the data is confirmed on targets at distance . The best way is to shoot groups on paper or big steel out past 700 and see where the actual impact is and back calculate the MV .

Using mixed brass iss a bad idea , I don't sort by weight like the bench rest guy's but it is all the same brand and preferably the same lot . The case capacity variations brand to brand will lead to big ES and SD issue's .

I try to stay away from magnum primers unless I have to because in smaller calibers they can lead to pressure wierdness for lack of a better term .

My Bartlien's in 308 and 6.5 have both been " fast " barrels . I would suspect at 22 inches 2675 - 2700 ish should be easily attainable . A thinner barrel is going to heat up way faster than a heavy one will , it may disipate the heat faster but it will take way less time to get hot .

Not letting the round cook in the chamber is always a good idea .

There is a really good book about the reloading process the Glenn Zediker wrote that has ton's of info in it , Reloading For Competition IIRC . If you google his name it will come up .

Vertical from velocity unless it is a stupid huge jump typically isn't going to show till past 500 yards .