I used a chronograph for the very first time last week. My wife and little boy were nice enough to give it to me for a Christmas present. It was easier to set-up and use than I thought and I was surprised by the results. I was shooting factory ammo in my 204 Ruger, 221 Fireball, and 17 Remington. For example, I was shooting Fiocchi 32 and 40 grain V-max. The 32's should have been getting 4,125 fps while I managed 3,925 for an average. The 40's should be getting 3700 fps and I averaged 3789 fps. In my 17 Remington I tried the Remington 25 grain HP and the Nosler 20 grain HP. The Nosler showed I should be getting 4200 fps and I averaged 4226 fps. The Remington specs said 4040 fps, but I struggled to get 3859 fps and it was horribly inconsistent. Velocity spread was 133 fps and my groups were not great. Lots of vertical spread which I would have probably blamed on my shooting technique had I not been using the chronograph. In my 221 Fireball, both Nosler loads averaged just over 3200 fps with the 40 grainers as they should and I had some old Remington 50 grain PSP which clocked at 2939 fps. I wish I had used a chronograph before now.