Springfield Armoury SPIW.
I am equally fascinated by the need to retain five digits on each hand - and have a strong distaste to earning the nickname or sobriquet "Stumpy".
- CAUTION in all matters - especially regarding experimental Hand-Loading eh.
If you are a reader - you may enjoy the history material about the SPIW and Flechettes found by following this Link:
Stacked Bullets For .357 Magnum Revolvers.
I am less nervous trying stacked tandem loads in straight walled handgun cartridge cases than I would be even thinking about high velocity rifle cartridges - but that has been done.
'Doubletap' Equalizer Duplex 10 MM Load.
My Hard-Cast 10 mm.
When they're made-up carefully by experienced loaders - you should still be able to order four beers with one hand in your local.
A different approach:
- A recent Russian designed rifle - The Nikonov AN-94 achieves a "duplex-like" effect by using it's pulley mechanism in 'Burst Mode' to fire two rounds at a rate of 1,800 rounds per minute.
Russian AN-94 Rifle.
- Both shots leaving the barrel before any recoil effect occurs.