Militec-1 as a pellet lube and it does reduce group size and keeps the bore clean.
I believe any pellet should be lubed for a high power airgun, say 800fps & higher as most are lubed from the factory for standard velocity airguns and its just a light thin film usually with a little graphite.
But the biggest problem I see is unwashed pellets have a lot of little chips of lead from the process of mfg. which can cling inside the pellet skirt throwing it off balance and perhaps causing a flyer.
Before I lube I'll put a batch in a glass jar, pour in some acetone gently shake then pour this out into another container for reuse using a coffee filter for straining, this is where you really see the crap! The acetone drys quickly, no need to wait overnight as when washed in soap & water, I let them finish drying on a doubled paper towel for ten or so minutes then put the pellets into a plastic sandwhich bag, a few drops of the Militec-1, shake gently getting it evenly distributed and back into a cleaned tin, happy pellets, happy air rifle, and happy shooter.