Author Topic: Here is a twist .... making .20 cal ammo from .22  (Read 137 times)

Motorhead

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Here is a twist .... making .20 cal ammo from .22
« on: November 01, 2018, 07:59:27 PM »
Been goofing around today in seeing if i can successfully Swag a .22 caliber pellet INTO a .20 caliber bullet ?
I did accomplish a simple way in doing so and it surprisingly worked pretty well too IMO  ::)

Starting with a stub of 3/4" 7075 grade aluminum drilled a .220" pilot hole @ .400" deep, then another 1/2" at .201" ( drills were corner edge broke so to make a very smooth hole ) Then O.D. cut to make an edge so it would drop into one of the holes on the bench block.  Took a punch and beveled the end to be the same angle as the skirt of the H&N barracuda 21.3 grain .22 cal pellet.  Placing a pellet into die / swag tool it sits on the skirt edge. Placing punch centered on pellet and tapping it threw via a few hammer strike on punch drive it thew the swag die exiting as a longer and smaller 21 grain .20 cal "Semi-Bullet"

* The last photo shows the skirt material is being forced along side the punch lengthening the skirt and will be grinding a slight taper on the punch to find that perfect taper where the skirt is a tad thicker and ends up a tad shorter.

Took the first 10 shooting them at 40 yards with a muzzle velocity of @ 870 fps threw a 20" choked LW barrel.   All landed inside 3/8" which was a shock !! .... loading however difficult being the barrel does not have sufficient free bore / leade and upon loaded you forcefully shove them into the rifling.  Got em loaded, but not ideal.

Have read people talking about this in the past, but never seen anyone actually do it ???


Scott


UPDATE;
Went back and ground a shallow taper on the punch. Now as the new pellet skirt is formed it does so with a tapering thickness and NOT pulling the trailing edge lead further back. Done with the reground punch OAL of the new .20 cal pellet / semi-bullet is @ .015" shorter that the first ones shown.  They fall off the punch now too once exiting swag die.


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steveoh

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Re: Here is a twist .... making .20 cal ammo from .22
« Reply #1 on: November 01, 2018, 08:55:51 PM »
Great idea! This is awesome and I bet you could sell a bunch of these.
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caniborrowsomeammo

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Re: Here is a twist .... making .20 cal ammo from .22
« Reply #2 on: November 01, 2018, 10:20:48 PM »
Looks good Scott. I've heard .20 is about the perfect FT cal., and getting a heavy .20 should be even better.
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oneshot61

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Re: Here is a twist .... making .20 cal ammo from .22
« Reply #3 on: November 07, 2018, 03:05:19 PM »
Now that’s a great idea. Some of the daystates or modded .20’s could make good use of that.

Motorhead

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Re: Here is a twist .... making .20 cal ammo from .22
« Reply #4 on: November 08, 2018, 07:40:28 AM »
Now that’s a great idea. Some of the daystates or modded .20’s could make good use of that.

I did so for use in a MODIFIED Daystate AIRWOLF that now wears a 20'" LW .20 cal barrel. Gun also fitted with a Heliboard upgrade and can make 40 ft lbs with heavy pellets ( Eunjin )
Have found the the JSB 18.1's work even better and size down due to there soft lead VERY uniformly.
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