I had a German made ( inter war, probably by Merkel) Manton of Calcutta double side by side BLNE which had been later fitted with a low power Khales scope.
It shot well, both barrels, with RWS and Seller and Belliot 196 grain 8x57 JR factory loads and the barrels shot sufficiently close together for stalking purposes.
Some of the RWS was Boxer primed, and some earlier but non-corrosive was Berdan primed.
I realised when comparing relative Right and Left points of impact that if I loaded RWS Berdan in the Right barrel and Boxer in the Left that the groups should exactly superimpose.
I tried that, and it worked, producing the best R&L 6 shot groups at 100 yards I have shot with a Double, which would have been more than respectable from a bolt action stalking rifle.
The primers were different colours, so it was easy to keep track, and I kept them at opposite ends of my ammo pouch. Had I got muddled they would still have shot sufficiently close for all practical purposes.
Using that system I did get a “right and left” ( all right they weren’t both “ dead in the air” at the same moment- I wouldn’t shoot the second until I was sure the first one was down) at Roe deer at over 200 yards.
I shouldn’t have sold it!
Last edited by Parabola; 10/23/21 02:46 AM. Reason: Correction
