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Rotometals Reclaimed Shot - Page 2 - Mountain Molds

Rotometals Reclaimed Shot

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mtngun
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Re: Rotometals Reclaimed Shot

Postby mtngun » Fri Sep 25, 2015 5:30 pm


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mtngun
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Re: Rotometals Reclaimed Shot

Postby mtngun » Sat Oct 10, 2015 11:39 am

Measuring the indentation after 1 month of aging with a USB microscope. The calipers were locked on 0.080", 7.9375 mm ball (5/16" diameter), 150.6 kg load for applied for 30 seconds. 46 BHN. :o

Now whether it shoots any better than a less hard alloy, I don't know. Much testing will be required to answer that question.
Image

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mtngun
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Re: Rotometals Reclaimed Shot

Postby mtngun » Fri Apr 22, 2016 2:43 pm

I acquired some more reclaimed shot, but this time from J.R. SHOT LLC on ebay (jrshot@att.net).

This was clean shot that looked like new other than being dinged. Unlike the dirty Rotometals shot, this stuff was easy to smelt.
Image

Density = 2768 grains/c.i., vs. 2719 gr/c.i. for Rotometals shot.

So right off the bat we know it does not have exactly the same chemical composition as the Rotometals shot. I'm bummed, but that was to be expected for a recycled product.

Air-cooled BHN = 13, vs. 15 for Rotometals shot.

Oven treated @470F = 34 BHN after 16 hours, vs. 40 BHN for Rotometals shot.
After 10 months = 32.6 BHN

SUMMARY: the "J.R." shot is better (harder) than clip-on wheelweight, but not as hard as my sample of Rotometals reclaimed shot.

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mtngun
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Re: Rotometals Reclaimed Shot

Postby mtngun » Wed Jun 01, 2016 11:26 am

Since my first batch of Rotometals reclaimed shot was good stuff, I bought some more. Well, the second batch looked different than the first batch. Density and hardness are different, too.

Density, and other alloys for comparison:
Batch #2 Roto Reclaimed Shot = 2768 grains per cubic inch
Batch #1 Roto Reclaimed Shot = 2719
J.R. Reclaimed Shot = 2768

Hardness
Air-cooled = 10 BHN
One day after quenched @470F = 41 BHN !

Wow! :o I was surprised it heat treated to 41 BHN despite being only 10 BHN air-cooled.


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