Re: Chrony readings vs published data
Your chrony is most likey very accurate.
Yes, some of the match grade barrels out there can and will produce higher velocities at a given powder charge weight. This is due to tighter tolerences and smoother finishes. Less powder is usually required to get top velocities.
When you have an understanding of bore qualities and tolerences, chamber tolerences, powder lot variations, free bore variations, you can imagine that 100 FPS really isnt that suprising.
The bottom line is that IF YOU ARE ABSOLUTLY SURE that you are not having pressure issues at the charge weights you are at, add more powder. If you are 100 FPS under book max and pressure signs are not there, then you can usually add more powder to get the velocity up. But to answer your questions, 100 FPS lower than published is normal. So is 100 FPS higher. That said, it is ALWAYS a good idea to start low and work up instead of the other way as 100 FPS higher than published in some calibers is VERY dangerous.
Hope that helps.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.