The one thing to consider though is the quality difference.
Yes, quality is also a big factor. First rate "once fireds" make quite a difference over blackened many times fired empties, with split mouths, pin holes and missing crimp
segments, etc. One enterprising reloader found velocity dropped off noticeably after about the fifth cycle of reloading. I use pretty much nothing but once fired "old style"
AA's and occassionaly Federal GM's.
Good quality, high antimony ( 6% ) round lead shot also makes a difference over lesser quality stuff. The difference they say is like quality hay for your livestock.
Good quality first rate stuff comes at a price. Stuff that's already been through the horse once is a lot cheaper !
Can't say as I like "Promo" loads at all, especially those with steel bases.
"Promo" Powder ( Alliant ) is another matter altogether. It is virtually identical to Red Dot, just denser. Charge weights should be checked from canister to canister.
I've found nothing wrong with Claybuster wads, although some report reduced velocities in cold weather. I don't have a chronograph, but don't have much trouble
breaking targets in the winter.
A pal of mine was a commercial printer. He was fastidious about his reloads, using only good compononents, used sufficient wad pressure to get good tight crimps
with a nicely radiused /bevelled mouth, etc. He went so far as to having a bit of fun with others by having some standard looking cartridge boxes made up
with his load information printed out on the top flap ( just like factory shells ) but in place of the manufacturer's name/logo, his wetre labelled in big, bold letters
"
FGR " ... when asked what "FGR" was his answer was simply"
F**king Good Reloads "... and they were.