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Cast Bullet Weight Variation Bottom Pour
vs. Ladle Pour


Test of bullet weight consistency when using the ladle vs. a bottom pour pot.

Test was done on the same day with the same pot, same casting session, same alloy, same metal temperature.

Test was done at the end of a casting session with a full pot of metal and a preheated mold that was casting perfectly formed bullets. All the bullets in both tests would have been considered perfect.

Pot:     Saeco
Mold:   Lee  379-250-RF
Alloy:   25% Linotype 75% WW
Temp:  750 degrees

Normal bullet weight with this alloy - 237gr.

Only the last digit of the weight is recorded. Add 23 in front of all weights to get the actual weight.

This is a two cavity mold. For the test, only the front cavity was used.

the mold was Lee .379-250-RF

Pour No. Bottom
Spout
Ladle
Poured
1 6.30 7.80
2 6.90 7.80
3 5.80 7.60
4 6.70 7.60
5 5.40 7.30
6 6.30 7.30
7 7.30 6.90
8 6.30 7.70
9 7.20 7.50
10 7.10 7.00
11 7.40 7.80
12 7.50 7.20
13 6.00 7.30
14 5.80 7.10
15 7.40 7.70
16 7.90 7.40
17 6.00 7.60
18 7.50 7.70
19 7.40 8.00
20 7.10 7.30
21 6.70 7.40
22 7.50 7.90
23 7.40 7.50
24 7.50 7.10
25 6.50 7.40
26 7.60 8.30
27 7.70 7.30
Total 186.20 202.50
Average 236.90 237.50
Max 237.90 238.30
Min 235.40 236.90
Variation 2.50 1.40
Std Deviation 0.69 0.32

 

 

Not surprising, the ladle poured bullets are significantly more uniform than those poured from the bottom spout.

Any statistician would tell you that this test proves nothing.
I would reply: "It convinces me."

 

 

Another Test With Another Bullet

Lee two cavity moldC308-170-F

Unlike the first test. This test uses both cavities.

Nominal Weight 170 gr.

 
Bottom Ladel
Pour Pour
171.3 171.3
171.1 171.2
170.9 171.1
171.3 171.1
170.2 171.6
171.7 169.2
170.2 171.5
170.6 171.6
170.5 171.5
170.3 171.5
171.6 171.5
170.5 171.3
170.4 171.3
171.2 170.8
170.9 171.1
170.0 171.5
171.4 170.9
170.9 171.4
170.4 170.9
170.3 171.0
171.5 170.6
170.5 171.2
171.2 171.2
170.9 170.6
171.2 171.6
169.4 171.0
171.2
170.8
171.1
171.3
171.1
170.5
171.5
170.9
171.3
171.3
171.3
171.1
171.1
170.8
168.9
170.8
171.0
170.8
Average 170.7846 171.0523
Maximum 171.7 171.6
Minimum 169.4 168.9
Maximum Variation 2.3 2.7
Standard Deviation 0.560494 0.526722
Average Deviation 0.470414 0.333471

 

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