470R:
Have you tried Mr Taipan's 215-grainers in the dainty double? They are very soft lead gilded in cigarette-paper-thin jackets...

Plenty of Ker-Splatt! on the grass-hoppers I would have thought!

I use 'em occasionally in a Lee Speed and a Martini Enfield, both elegant Army & Navy sporters with fast-twist barrels. Suitably delivered, the 215-gr Taipans are indeed bombs on pigs!