As far as I know all 10ga hulls are straight walled hulls. The Rem SP-10 is even a little loose in a Rem hull. The Cheddite primers are fine - same diameter as Win, Fed, or Rem - or close enough not to make a difference. I've been using the BPI 10ga wads - cheaper than the SP-10 wad. For low pressure target loads [ 1oz in the 10 ] I just treat Rem, Fed, Win, and RST hulls all the same for reloading data. Haven't had a problem yet.
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Paul Harm
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