I bought a used chronograph at a yard sale about 3-4 yrs. ago for $10 and it served me well till about 3 weeks ago when it gave up the ghost. A few days ago son Matt came over after cleaning out a shed or house, not sure which, for an older lady and asked me if I wanted a few of the things he didn't put in the dumpster. Among the things was an old/no longer made chronograph in new condition except for dust. I cleaned it up and took it to the range today (only took 4 shots) just to check it's function. Wala I have another working chronograph at the very perfect price of $0.
It was the exact amount of $$ I had to spend on one at this moment in time. I (almost) had the lowest es I have ever shot. I started with a clean barrel and Knurled copper solid Barnes bullets with a wad in my Scout. Cold clean bore went 2620 then 2642 (democrat) then 2621 then 2621. I wasn't trying to shoot a group just testing this chrono out. The second shot loaded a little harder 1-3-4 all loaded the same. I may make a Knurling fixture to get more uniform Knurling/bullet size in the future.
Richard I did over knurl but didn't resize just pushed them down and dropped my powder charge some and shot 4 on a fouled barrel. Cold bore #1 2540 2-2559 3-2559-4-2559. I thought something isn't working right with the chrono but shot a 22 rifle through it when I got home and it registered every shot. I have a couple times got a 2 ES but never a 0 ES. Also that load grouped very good for copper solids.