My three penneth , when we shot 32gram and had to change to 28gram AJ Smith moaned his head off .
About a year later AJ was telling everyone how brilliant 28gram was.
Express used to do a 24gram in a mauve case , absolutely wonderful cartridge.
A friend of mine is a very good shot, he uses Fiocchi Fblack 8's and Gold Trap 7 1/2s.
Recently his good lady made us both look positively shabby on a VERY distant target using 21gram Fiocchi TT's.
There was absolutely nothing wrong with the quality of the kills at all.
Now would any of us use 21grams in a competition ? Probably no chance.
Another anecdote , Hodnet presents superb targets that test the best in any of their competitions. You can then shoot those very same targets with equal success on a practice day , a lesson , or a corporate day using Hodnet's own corporate cartridge which is 21gram.