I'ld suggest checking to see if you'e not useing to much lube in your forming process ?
If you use the 7-08 brass, make up only 2 or 3, trim and check for fit, depending on your chamber you might have to neck turn or inside ream.
an easier way , IF excess lube isn't your problem would be to use either 22-250 or 250 savege and simpley neck up .
Just a thought ,