I've got to backtrack a bit on my .22 Monster RD stance. And here's why.
I recently reconfigured a gun (barrel/reg pressure/hammer tension/valving/etc), intending the "tune" to be used for the Grands. Grabbed it to head to the back pasture for some accuracy testing, and on a whim, had the idea to grab a tin of .22 Monster RDs instead of the Grands. These aren't any of the new production MRDs, I'd guess that I purchased them around 2022. Maybe one of the better batches that I've had, but certainly a batch I've struggled with, typically producing random flyers from various barrels at various speeds. Historically with this batch of MRDs, the average EBR scores have probably been something like 205 to 220, across LOTS of shooting and lots experimenting to get them better.
So, shot them from the gun with the new "tune" and they scored a 234 on that first card. Okay, eyebrows raised. Zero flyers, they all went pretty much where I'd expect, with what the wind was doing and my slight user inputs here and there. First thought-FLUKE! I've since gotten that gun and the 2022 MRDs out in 3 more sessions over the last couple weeks. A total of 5 cards have been shot. They are: the original 234, a 237, a 222 (windiest day), 238 and a 224. There have been a few shots that hit slightly lower than expected, but overall, it's been a night and day difference with this new "tune." The average of those 5 cards is a 231. Mathematically, averaging a 231 versus the prior 210-220 doesn't sound like much, but that's a big difference when shooting a card at 100 yards.
They're not my currently best performing long range pellet, but the new "tune" has produced a HUGE difference in how much tighter they're grouping than any and all previous attempts. I wish I knew what was different about how the gun is configured to have changed things so drastically. A friend suggested that it's perhaps not just the speed that makes a difference in how the MRDs shoot, and that's a better idea than anything I can come up with. I've not found any other pellet to perform so drastically different, just based on how the gun is configured. This little experience has lead to some deep ponderings in the last two or so weeks.