L-R. 284/168 Berger,
6.5 Gertrude/140 Berger,
6 Dasher/103 Copper head
22 BR
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The 6.5 Gertrude is just a 25 WSSM necked up to 6.5mm and neck turned so the neck thickness is the same as standard turned cartridges, unlike the 0.022" they come with. It is also throated out to suit 140gn pills. It is like a scaled up 6BR, with good neck length and the same 30 degree shoulder as the PPC/BR.
It will shoot 140gn bullets at the same speed a 6BR shoots 105gn bullets, or 130gn bullets at 6 dasher speeds.