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My own group (all for the Contender) includes:
.257 JDJ
6.5 JDJ
.309 JDJ
.338 JDJ No. 2
.375 JDJ
.338 Woodswalker

Other non-wildcat SSK barrels are:
.45-70 (6.5" ! it was a gift)
7.63 Mauser - dimensionally identical to 7.62x25 Tokarev
.225 Winchester
.480 Ruger

My favorites of all these are the .257, .338 No. 2, and .375 JDJ's, but there are no
flies on any of them. JD's contributions to handgunning are deep and wide ranging.