I do not use a chronograph when I test bullets. I look for an accurate bullet with as much powder as I can use to keep it accurate. I shoot from a 22" to a 32" and never let the barrel length really concern me. Now granted, if I were shooting 200 yards each day, then I might see the need to do more testing. But for 100 yard shooting, there is no need. If the load is accurate, it will work.

Your numbers might be very correct. Sabotloader does a lot of chronograph work and might have some good information for you.