Originally Posted by
NicfromAlabama
I know I'm coming in late and repeating what has already been said and discussed, but unless you are using a chronograph, you can only speculate that your POI has shifted due to velocity. You mentioned purchasing a Magnetospeed. Again, as discussed, clamping something to your barrel will affect harmonics, and if you are looking for load development for groups, that may not be the best tool IMO. I have gotten by with a cheap Competition Electronics Prochrono model, which has worked well, with one caveat. I had to buy the indoor light kit for reliability, and RARELY due I have an error reading when using the light kit. I do agree with buying quality equipment though, but I can't complain about my chronograph. I'd be very lost without it. As said, even an error now and again still beats guessing.