I just had a hammer gun pierce every primer in RST shells (Cheddite) but the same gun never pierced a WW 209 primer in any reload no matter the load, from one ounce to one and a half. I would not suspect the WW 209s.
On the hammer gun I could see a sharp point and I took it down with "beauty shop" emery boards (600 then 1000) until the point was gone. which did stop the RST primer piercing.
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