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Posted: 4/5/2010 11:35:31 AM EDT
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Due to the .458 Socom forum being down I figured I'd give getting some advice from the experts here the chance to put in their .02. I've reloaded some 325 GR FTX Hornady in starline brass using Hodgdon H110 with WLP primers. Powder measurements are as follows:
5 rounds - 32.7 gr 5 rounds - 32.9 gr 5 rounds - 34.0 gr 5 rounds - 35.0 gr 5 rounds - 35.5 gr Brass trimmed using Lee case trimmer. COL is 2.175" on all rounds I used some load data from another gentleman's post using H110, however he used 300 gr Nosler's with 36.21 gr seated at COL of 2.20". I used this as a baseline and reduced the charge by 10%. I've shot the first five rounds of 32.7. All brass appeared okay except for my third shot which has some slight pressure signs on the head of the brass (primer also appears to be very slightly flattened). I have yet to shoot the next five rounds. I know I got too hasty with my last three sets of rounds. I think I will be okay to send the next five down range. I'm just wondering if I should pull the projectiles on the other fifteen. Any advice? Thanks for any input. MM |
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Since nobody has chimed in I will.
Are you positive that what you're seeing are pressure signs? The reason I ask is because typically the .458 socom won't show ANY pressure signs until the bolt lugs shear. Because it's a low-pressure round, it doesn't show signs like most centerfire rifle cartridges. So you just have to faithfully follow published loads. I'm not saying that you aren't seeing pressure signs, I'm just very skeptical about it. |
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Quoted:
Since nobody has chimed in I will. Are you positive that what you're seeing are pressure signs? The reason I ask is because typically the .458 socom won't show ANY pressure signs until the bolt lugs shear. Because it's a low-pressure round, it doesn't show signs like most centerfire rifle cartridges. So you just have to faithfully follow published loads. I'm not saying that you aren't seeing pressure signs, I'm just very skeptical about it. 
Read thuis thread. http://www.ar15.com/forums/topic.html?b=6&f=42&t=310487 |
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Quoted:
Since nobody has chimed in I will. Are you positive that what you're seeing are pressure signs? The reason I ask is because typically the .458 socom won't show ANY pressure signs until the bolt lugs shear. Because it's a low-pressure round, it doesn't show signs like most centerfire rifle cartridges. So you just have to faithfully follow published loads. I'm not saying that you aren't seeing pressure signs, I'm just very skeptical about it. From what i'm seeing, this is not true. |
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It is my understanding that if you load H110 to low you can get some crazy pressure spikes. I have not loaded the Hornady 325 gr. FTX, but I have loaded the Rem. 300gr. JHP and Rem. 405 gr. SP with H110 and worked my way up to 34.5gr (300gr. JHP) and 33.0gr. (405gr SP).
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Quoted: Since nobody has chimed in I will. Are you positive that what you're seeing are pressure signs? The reason I ask is because typically the .458 socom won't show ANY pressure signs until the bolt lugs shear. Because it's a low-pressure round, it doesn't show signs like most centerfire rifle cartridges. So you just have to faithfully follow published loads. I'm not saying that you aren't seeing pressure signs, I'm just very skeptical about it. broken, repeated nonsense |
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Ok, so according to marty in the other thread you'll primer flattening and case-head imprints at high pressure.
So tell me, how can a primer used in loads that go upwards of 50 ksi and not show flattening miraculously show flattening at 35 ksi because that is the max pressure for the round it's being used in? Same thing for the case head? How can brass that won't deform up to 50+ ksi miraculously deform at 35 ksi? I'm calling BS on all the BS callers. Take a .458 and work up to where you see signs of pressure like a typical rifle and tell me that you're under max pressure, I'll put money on the fact that you're WAY OVER MAX. You may not see Bolt lug issue, and I admit I guess I was wrong on that, but it was my impression that the max pressure for the round was set by the strength of the bolt lugs. So is marty saying it's ok to go over max, and in some cases go WAY OVER max? |
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Quoted:
Due to the .458 Socom forum being down I figured I'd give getting some advice from the experts here the chance to put in their .02. I've reloaded some 325 GR FTX Hornady in starline brass using Hodgdon H110 with WLP primers. Powder measurements are as follows: 5 rounds - 32.7 gr 5 rounds - 32.9 gr 5 rounds - 34.0 gr 5 rounds - 35.0 gr 5 rounds - 35.5 gr if you haven't shot the >33gr loads, i wouldn't. Max pressure, as defined by Marty, is 35K psi. QuickLoad is showing this max at about 33.5gr for COAL of 2.19. I was seeing consistent extractor, ejector imprinting at 32.5 and above. Still need to get the chrony out, but am guessing these are going to run about 1725 fps. Good luck - i'd keep the face away from the bolt area on the heavy loads. |
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High pressure signs on 458 SOCOM brass http://i31.photobucket.com/albums/c392/imtheflash/weapons/socomextraction2.jpg Just wondering what load this was?? |
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Quoted: Quoted: High pressure signs on 458 SOCOM brass http://i31.photobucket.com/albums/c392/imtheflash/weapons/socomextraction2.jpg Just wondering what load this was?? I'll have to look at my notes, but from what I recall off the top of my head it was H110 powder around 36 gr, but I don't remember the bullet weight. I did end up pulling most of these bullets with that charge. |
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