Today I was doing some final testing of a load for my 24F. I was shooting the same load in new and once-fired hulls. I'd been developing loads using both but the onc that shot best was a Cheddite 3" hull with a W209 primer. They had been once-fired because I'd used the new hulls with the Cheddite primer it came with. This time I punched out some of the Ch209s and put W209s in new hulls. The once-fired hulls shot 2 1/2" to 3" 5-shot groups at 75 yards- same as during earlier testing. The new hulls were consistently 10" plus.
Interesting....
John