March 29, 2010, 03:33 PM | #1 |
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Holy hot loads.
Just wondering if anyone had an opinion as to why the loads I shot today are so much faster than the published data.
I am shooting a S&W 629 8 3/8" barrel in 44 Mag. I got the load data from the Sierra manual. I loaded 23.7 grs of 2400 (not max load). I used RP brass trimmed to the proper length, CCI 350 Mag LP primer, and a Sierra 210 gr JHC. The published data says 1400 ft/sec shot from a Ruger with a 7 1/2" barrel. I corno'd mine at an average velocity of 1609 ft/sec. That seems like a considerable difference to me??
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March 29, 2010, 03:38 PM | #2 | |
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March 29, 2010, 03:38 PM | #3 |
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How far were you from the Chrony?
Alliant shows a velocity of 1566fps with 23.5gr of 2400 under a 210 Speer GD bullet with a 7.5" barrel so I don't think that you're necessarily too far off considered the difference in barrel length.
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March 29, 2010, 03:58 PM | #4 |
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Peet, I was about 10 ft from the crony. Maybe Sierra doesn't have the correct velocity. Your data makes a bit more sense. I have found that any firearm my partner and I test is off from Sierra's data but it's usually not that much and we chalk it up to different test weapons. I just thought 200 ft/sec difference might be something to be concerned about. Maybe not?
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March 29, 2010, 09:17 PM | #5 |
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Well, I ran the data in Quickload using generic cartridge/bullet lengths and although the pressure in QL doesn't match well (at all) with revolvers, it does show a velocity difference of about 60fps between a 7.5" and 8.75" barrel. I would suspect that the real difference in a revolver would be less, due to the gap, but considering that you've got an additional .2gr of powder, I'd say that the book numbers and your numbers are actually in excellent agreement.
Subtracting the 60fps from your numbers put you just 3fps off their numbers.
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March 29, 2010, 10:13 PM | #6 |
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I thought min distance to the Crony was suppost to be 12 feet?
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March 30, 2010, 01:54 AM | #7 | |
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March 30, 2010, 09:14 AM | #8 | ||
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March 30, 2010, 09:38 AM | #9 |
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Does the load call for the Magnum Primer? That may be the culprit.
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