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Borchardt's # I have 505-535-2923 ..
28ga cases are made by Rocky Mtn Cartridge, Barrel is rifled with 4 grooves, 1-22 twist. You could do one on Savage 210.Another shotgun bolt action that would handle it with little work, heavy barrel, is the 395-495-595-695 bolt action Mossberg. Just show that 28GA FH isn't puny, here is picture of it next to a 505 Gibbs.Ed
; : Please advise the exact groove diameter of the 28 bore, please. For me, this thread is again attracting my attention. The 28 sounds worth making up for playing around here. A .54/170?/3-1/4 - cool! 170 was just a guess. ; First measurement on a Ruger #1 Action showed rims to around .60" only would be allowed without some grinding.
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