On a whim I bought a box of 100 of these silly things as part of an order from Matt's bullets to play with. I think these things might be shorter than they are wide, so I didn't expect much accuracy at anything beyond point-blank.
Here's what I found:
Loaded singly using old Lyman data presented on the page where the bullets were ordered. In my case I went with 2-3 grains of Bullseye.
In one well-worn 4" K-frame, not knowing what to expect I started out at 15 yards and found 10-shot groups from 3-4". Pushing out to 25 yards the better of the loads (2.6-2.8) ran to about 4". There was of course no recoil to speak of, so for shooting on the cheap or with novice shooters it might have some applicability where great accuracy isn't needed.
Then I tried them loaded duplex. Yep, two bullets stacked in the space (and with the charge) of a regular 148 wadcutter, in this case 3.1 grains of B/E. At 10 yards I got one bullet right near the point of aim and a second almost directly above it by about 1.2". At 15 yards I noticed the upper bullet had drifted to the left as well at about a 30 degree angle. So, pretty interesting. I'd be really interested to see how these did with a little heavier load and at slightly longer distance. I'd also be very interested to see some ballistic media testing showing wound cavity and penetration. I'd be reluctant to use the load for self-defense for the "be aware of what's beyond your target" aspect of hucking a second projectile off your sights but on the other hand, the risk of overpenetration would be lessened and one could just consider it a OO-buck round with just two pellets.
You would guess from a wadcutter that short and the accuracy I saw in the 4" gun that these just can't be accurate at any distance at all, but testing in a second gun, a 6" K-frame gave me consistent 10-shot groups under 2" and with the mid-power loads running to about 1.6" I'd see two clusters in that, so I assume I'm getting a slightly different hold after the reload and six-shot groups would smaller.
They did shoot low... like 8" low, so be prepared for that.
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On the whole, they were great fun and I've ordered another 500 to play with. Mostly as target rounds but that duplex loading thing deserves a little more exploration as well. Next time somebody gives me a ration for the low ammo capacity of my revolver, I could tell them it's a 12-shooter!

With the short bearing surface they usually do better at mid-range velocities ... my theory is the extra fps gets them spinning and balanced better .
Duplex bullet loads ... I would not want to get shot with one , multi-projectiles are nothing new , fun to play with and interesting ...find the velocity sweet spot and they should group well at "in the home" defense distances ... also not a bad idea where a lot of penetration is not wanted ...inside a house or apartment ... something to consider !
Gary

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Certified Cajun
NRA Member

One other use for these is to make your own snake/bird shot loads with an extra punch. Use a cereal box and a sharpened up piece of brass to cut your own wads to cover the powder. put some shot in there---I like duplex of #4 and shaken in #12 too fill the gaps. Then cap with your little 75gr plugs. When you get to playing with these, be sure to write us up a report and include pics of the patterns.

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"Tastes just like chicken"

I had a friend that loaded two balls in his 45 cal muzzle loader. He claimed 4" separation at 100 yards.

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Front sight and squeeze

Remington used to market "multi-ball" loads in both .38 Spl and .357 mag. Fun to experiment with, I suppose prior to hollow points that will reliably expand, in ballistic gel at least, it would be an option to a RN lead load.

Interesting post. Thanks for taking the time to try this and it does look like fun.
A little imagination is all it takes. 😎

Dean Grinnell wrote many decades ago about 3 in a 357.

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Front sight and squeeze

very good idea !

agreed !!!

I'm glad someone has an excess of small pistol primers.

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S&WHF 366

Very interesting. If carried for self defense it would be equivalent to getting hit with two 32acp simultaneously. Sounds effective.

Things are pretty tight actually, but I enjoy load development so I just budget a percentage of my primers for R&D.
Still, it does weigh on my efforts and I'm much more inclined to just make the "best known load", where before I was more apt to drag home any old projectile I could buy cheap at a show and develop a load for that I'd get refined about the time I ran out.