A story about 'load devlopment': I'm on the BOD of a private range, the Dakota Benchrest Shooters range. Since it's a members-only range, most everyone has good gear, solid rifles and shoots in a very safe manner. In short, it's a wonderful place to test and practice.
Last Summer, I had my HV 30BR out for some practice at 200 yds. Winds were 15-ish from 5 to 7 o'clock which at our range (we face South East) can give you significant 'on target' vertical. The flags would push from 5 to 7 o'clock and snap back really quickly. But the mirage was perfect for these conditions and would always move before the flags did. Per my normal
practice routine, I shot two 5 shot groups across the full condition (no holding for conditions...same POA). This gives me a sense of how much total condition is out there. Both 5 shot 'test groups' showed from 5/8-3/4" of 'on target' vertical....just a bit less that I thought it should be. But both groups showed the same appearance across the full condition so I was happy with the trend. Then it was off to the races and I shot two NBRSA 200 yd. Score targets.
I'd finished up, the barrel had solvent soaking and I was sizing cases when the only other shooter there asked if it was ok to go get his targets at 200. We walked down together...he was a very nice young-ish guy and was shooting some sort of chassis stock and obviously working with hand loads, not factory ammo. He had his LabRadar chrono all set up, his phone all synched to it...the full meal deal. Might have even had a coffee maker plugged in.
I grabbed my targets and he was over there making notes on his...bullet holes everywhere. By each hole, he put a number.
Back at the benches, I was packing up my gear, trying to keep stuff from blowing off the bench. He came over with his targets and showed me his notes about where the "...nodes had flattened out" and why some of the increasing charge weights showed lower impact points due to "...barrel harmonics and OBT. You know....Optimal Barrel Time?"
I showed him my two full condition test groups and commented that before he came to too many conclusions, he should consider that there was fully 3/4" of
condition out there, even with a perfectly executed shot. I'll spare the details but we had a really good discussion about this. A few weeks later, I saw him out there again. He'd made up a few flags and was shooting at 100 to get the feel of them. I asked him how he was doing with them and he said: "These things just pizz me off. They pizz me off because they remind me how much money I wasted before using the damn things!"