This forum seems more reasonable on claims of MV than most other forums. On some forums I see all kinds of wild claims. I shoot several rifles in assorted chamberings. I've come to suspect this optimism of MV is caused by cheap chronographs. I have a Chrony and while it's consistent, I believe it reads about 100 FPS high on the top end. It reads my .270 Winchester with a 22" barrel shooting a 130 grain bullet with 57 grains of IMR 4831 at just a shade below 3200 FPS. This is about 100 fps faster than most books allow for the same load with a 24" barrel. It reads my 280 Remington with a 150 grain Nosler Ballistic Tip at just a shade under, 3,000 FPS. It has a 26" barrel but even at that it's about 50 FPS above what most books show. It also reads my .30-06 with a 150 grain SGK at 3100 FPS. It has a 24" barrel. But most books I've seen show a max of 3,000 FPS with the same load and same barrel length. So I really believe cheap chronographs are the main reason for overly optimistic velocities being reported on forums. Maybe I'm mistaken here but at least my Chrony is as such. But these velocities I see on various sights correspond suspiciously close to what I see on my Chrony.
Last edited by Filaman; 06/20/19.
