I almost made a huge mistake had it not been for my son at the range and jacking me up. I was testing cast bullet loads with my pistol and they were not grouping. I was shooting badly and my mind starting racing: alloy, sized too small, is lube a issue, seating depth, variations in reloading procedures etc etc. My son came over and shot a few mags and grouped well. In fact his groups mimic what I had been finding the case last week so what the blazes was my problem. My son asks me where is that thing you put on your glasses so you can see the front sight?
So here I was, about to tear up my loads and go into a tail spin cause I had a senior moment and forgot I can't see but a blurr without that crutch on my glasses. I found it in my shooting bag and things got nomal again.
I am not going to put up a big sales pitch other than say old eyes make for poor shooting and if you got old eyes, email me and I will send you where to get this 20 dollar stick on. This is not new technology as older shooters have used an aperture on glasses to bring iron sight picture clear. The thing I use gunpal is cheap and sticks on / off ... if I remember to do that.
Before you go in to a tear down of loads etc etc, one should do what I did not do: stop and figure out what could be the variable at play. I was consumed that I make good ammo so there is something dynamic going on and being defensive about reloading: something was out of adjustment.
The only thing out of adjustment was I was not paying attention to basic pre shooting gear so I could see the iron sights.
Whatever you do, if you got old eyes, do something so you can see iron sights. You do not have to go to a scope just yet. That will come eventually but try something before that.