Herter's shells are Italian loaded Cheddites.

They are CIP spec shells.

While inexpensive (yay), they are not 'cheap'.

I've burned a couple thousand of them this year and they function well.

Zero failure to fire or failure to extract or eject and they burn clean.

They have to be assumed to be CIP maximum unless tested otherwise, and even then if the pressure isn't actually published by the manufacturer there is no guarantee the next lot won't be loaded with different components and/or powder.

Large producers load to velocity with non-canister powders and the products while within spec can vary quite a bit from lot to lot and year to year.

Examples would be the evolution of the Estate brand, or the ever annoying Winchester crap from Australia.

"The price of good shotgunnery is constant practice" - Fred Kimble