Author Topic: Weighing Bullets, Part Deux  (Read 86 times)

Steelhead

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Weighing Bullets, Part Deux
« on: March 14, 2019, 04:35:52 PM »
Being a newbie to casting I'm learning a few things that I didn't know before or had assumed. I'm starting to get better at knowing temperature, lead behavior, flow rate, etc. and it's showing on my finished product. What I'm surprised about is the variance in weight. It doesn't matter what size/brand mould I use, I get a big range.

I'm currently weighing every bullet I cast. It's extremely tedious, but I look at it as a meditation time, not a chore. Taking the three bullets that I'm currently using, I'm seeing as much as 3 grains difference commonly on the larger 134 and 150 gr. bullets and 2 grains difference on the 133 gr.  That's not counting the really over/under ones. In the process of weighing I narrowed down a middle ground that seems to be the majority (133.6 to 134.5, 152.5 to 153.5, and 116.5 to 117.5)  It should be noted that I had a lot of bullets that were way out; maybe one in twelve. Shooting at 200 yards with one bullet weighing 114.1 and one bullet weighing 118.5 HAS to make a difference.

This is all very educational. For me I want to eliminate as many variables as I can. In the grand scheme of things, this is an easy one. The whole point of casting big bore ammo to me is making a better product than I can buy at a reasonable cost.

One little thing I'm finding is that some of my 150 gr. bullets have a 'foot' on them from the sprue hole. It's rough and sometimes a little irregular bump making the bullet 'stand crooked'. What causes this? It's annoying the heck out of me. 


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sixshootertexan

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Re: Weighing Bullets, Part Deux
« Reply #1 on: March 14, 2019, 06:22:46 PM »
Kevin I just weighted some BBT's that I had casted and sized. These are out of the same bucket of the ones I sent you.  I had grabbed a handful the other day and sized them with my new NOE sizer. Just waiting to get to go shoot them. I actually weighted them 3 times on my digital scales. On the first go just as I finished I noticed the scale was not going back to zero. I realized I had the ceiling fan on and it was effecting the scale. I weighted each picking up bullets at random and recording it in exel. I did that twice. I then told it to put them in ascending order.
Low 132.32
High 133.28
Spread .96
Column #1 4518.10 average 132.88
Column #2 4518.62 average 132.90

 132.32   132.34
132.34   132.34
132.64   132.66
132.66   132.66
132.70   132.70
132.70   132.70
132.72   132.72
132.74   132.74
132.74   132.74
132.76   132.78
132.78   132.80
132.84   132.86
132.86   132.86
132.88   132.88
132.90   132.92
132.92   132.94
132.92   132.94
132.94   132.94
132.94   132.96
132.94   132.96
132.98   132.98
132.98   133.00
132.98   133.00
133.00   133.02
133.00   133.02
133.00   133.04
133.04   133.06
133.06   133.06
133.06   133.10
133.10   133.14
133.12   133.14
133.14   133.16
133.14   133.18
133.26   133.28
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Steelhead

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Re: Weighing Bullets, Part Deux
« Reply #2 on: March 14, 2019, 06:34:20 PM »
I'm thinking this has something to do with how I cast. Maybe temperature (lead and mould)...not quite sure. The run I did of the 113's today came out averaging a grain more than the run I did the other day. Lots to learn. If I had numbers like yours I wouldn't weigh them. Although, now that you posted that I will weigh the ones you sent me and see what I come up with.

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