7.62x39 Expansion In Water At 100 Yards

Off the shelf ammo for all Rossi firearms.
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LowKey
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7.62x39 Expansion In Water At 100 Yards

Post by LowKey »

Did water expansion tests at 100 yards with some 20 year old China Sports 123 grain soft point
that groups well in my Mini-30.

Also tested Monarch 123 grain HP polymer coated.

Rifle used was my CZ bolt action. Both brands group well in the CZ.
Water buckets view from 100 yards__.jpg
The water buckets look bigger in the rifle scope.


Target and Water Buckets with Sand Backup_.jpg
5 inch square cut out to expose plastic water bag__.jpg

The first shot of each brand of ammo was fired into the target to the right of the buckets
to determine the ammo's relative zero.

Then the expansion shot was fired into the buckets' 5 inch square cut out.
The 5 inch squares were cut out of both the front and back of each bucket,
allowing the bullets to impact the water bags without going through the buckets' hard plastic.
The hard plastic can limit expansion.

Each bucket contained a plastic bag filled with water (because the buckets had the 5 inch cut outs).

The China Sports expanded well, with 103 grains retained weight.
The casing and copper colored jacket would stick to a magnet, the lead colored core would not.

The ongoing China Sports corrosion test looks good so far,
but going to give it another couple of days before proclaiming it non-corrosive.

No expansion or weight loss by the Monarch.
The hollow point was not clogged.
China Sports 7.62 SP expansion core and jacket.JPG
Monarch 7.62x39 HP polymer coating no expansion.JPG
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Re: 7.62x39 Expansion In Water At 100 Yards

Post by Ranch Dog »

Great info, really like this kind of testing!
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Re: 7.62x39 Expansion In Water At 100 Yards

Post by GasGuzzler »

Looks like fun.

Did they go all the way into the sand?
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Re: 7.62x39 Expansion In Water At 100 Yards

Post by LowKey »

GasGuzzler wrote:Looks like fun.

Did they go all the way into the sand?
The first ammo tested was the China Sports SP that expanded nicely.
The projectile was found in the second bucket of water.
It did not penetrate into the third bucket of water or go in the sand.
The shock wave from the expanded soft point destroyed the first bucket.

Next was the Monarch HP that did not expand.
It was shot through the two remaining buckets and was found in the sand.
Interestingly with the non-expanding HP, the first bucket remained intact
but the shock wave destroyed the second bucket.

The length of each bucket of water was 10 inches.
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Re: 7.62x39 Expansion In Water At 100 Yards

Post by HarryAlonzo »

Tell us about your cat(s).
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Re: 7.62x39 Expansion In Water At 100 Yards

Post by Ranch Dog »

HarryAlonzo wrote:Tell us about your cat(s).
+guns

Someone would think the same of me. I buy the stuff in 5-gallon buckets as well but to clean up the messes my tractor and implements leave on my barn floor.
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Re: 7.62x39 Expansion In Water At 100 Yards

Post by LowKey »

.
Square buckets work better than round buckets.

With round buckets, often the projectile slows down in the water
and bounces off the curved surfaces of the 2nd and 3rd buckets.
If the projectile lands in the grass, it's lost forever.

Out of the three square buckets used for these tests, only one can be used again.
The two kitty litter buckets were torn up beyond repair.
Only one square bucket out of three is re-usable.JPG
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Re: 7.62x39 Expansion In Water At 100 Yards

Post by HarryAlonzo »

True enough, kitty litter is the best inexpensive oil absorbent there is.

But I miss my cat.

I want to know why Lowkey needs 5 gallon buckets of sildenafil citrate.
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Re: 7.62x39 Expansion In Water At 100 Yards

Post by Ranch Dog »

HarryAlonzo wrote:I want to know why Lowkey needs 5 gallon buckets of sildenafil citrate.
I figured you would ask! I guess he is a busy fellow.
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Re: 7.62x39 Expansion In Water At 100 Yards

Post by akuser47 »

Great info
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