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April 13, 2012, 07:17 PM | #1 |
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Translating cubic centimeters to grains
How do the following measurements of cubic centimeters translate into grains? Or could someone send me to a link for a caultulator that could do this?
095, 100, 105, 110, 116, 122, 128, 134, 141, 148, 155, 163, 171, 180, 189 and 198. Thank you -rich |
April 13, 2012, 07:19 PM | #2 |
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Cubic centimeters are a measure of volume.
Grains are a measure of weight. They don't translate unless you have a specific weight to volume figure for the substance in question. Normally black powder shooters worry about this, good article on it in the last Handloader magazine. Jimro
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April 13, 2012, 07:29 PM | #3 | |
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Thank you. I think I'm missing something. I'm looking into buying this shotshell reloder from Lee:
http://www.midwayusa.com/product/436...la=ProductDesc In the product description it reads: Quote:
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April 13, 2012, 07:33 PM | #4 |
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Ahah, what it means is that you'll have to experiment with the powder you are using to figure out which bushing to use. Lee usually ships a "powder grain per CC" chart with their products to help with this.
I don't trust charts, so when I set up my Lee Autodisk I threw a number of charges and recorded the data until I figured out what my powder was doing. I ended up using a double disk of .88 cc per disk for a 24.4 gr charge of 2000-MR. Your bushing will be the same, just make sure you verify that the bushing is in fact throwing the charge you want and you'll be fine. Jimro
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April 13, 2012, 07:37 PM | #5 |
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198cc of powder
Good luck with that. Sent from Android CyanogenMod 7.2 |
April 13, 2012, 07:46 PM | #6 |
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Someone forgot the decimal... 198 cc's of anything is close to a soda can size charge. Good for 30 mm I'm sure.
Jimro
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April 13, 2012, 07:47 PM | #7 |
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Jimro- Thanx man Now I know I need to get a digi grain scale. Was planning on getting one soon anyway.
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April 14, 2012, 07:30 PM | #8 |
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Go to this link and look at the chart on page 2.
http://leeprecision.com/cgi-data/instruct/AD3398.pdf Lee gives what they call the VMD of each powder. That figure multiplied by the number of grains you want to dispense will give you the disk hole to use. This is only a starting point and actual weight is usually lower than stated.
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April 16, 2012, 06:46 AM | #9 |
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As noted you have to use the table lee provides. The lee table generally will drop short or light charges. The table is based upon only one batch of powder. The actual density does varry by batches so each time you get a new can of powder you have to reconfirm the tables. So get yourself a good scale!
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April 16, 2012, 05:32 PM | #10 | |
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Quote:
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April 16, 2012, 06:40 PM | #11 | |
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Quote:
Powder changes from lot to lot, and sometimes those changes become cumulative over time. Several years ago we all had to re-figure our IMR 3031 charges because some of us were getting close to max and a reformulation put us over max. I had to reduce my top .30-30 loads by a full grain with new 3031. Still, there are lots of cartridges reloaded every year with volume measures. I'd hazard a guess that the vast majority of .45 ACP, .38 special, and 9mm are loaded volumetrically. Check your measure with a good scale and don't try to push the envelope. |
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