more of a question of what powder they may be using, along with the powder they might be using, which is canister or not available here. They could be using a powder that is faster, but using less of it..
I don't use H 4895 for reduced loads, as I don't find it that accurate, yet it has a much larger retort when you pull the trigger, that does using IMR 4895 with the same reduced charge weight, and IMR 4895 is much more accurate with reduced loads, vs H 4895.
For reduced loads, you can use either 4198s, ( I prefer IMRs tho), or RL 7, obtain the same velocity, with less powder.
I have used some different powders in reduced load ammo, and even tho they are faster powder, their point of impact is higher and sometimes several inches ( to include 4 or 5 inches @ 100 yds) than regular powered full loads,
A lot of variables on what and why you are seeing it. I'd disassemble the PPU load ( one cartridge) and see what their charge weight is.
These are generalities I've seen, but there are too many variables to tell you what it is.