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Old 08-04-2012, 9:40 PM
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Quinc Quinc is offline
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http://www.reloadammo.com/458-socom.htm

Quote:
(Note: Many are near maximum loads, you should use 10% less to start.)
(See note on Powders below or read all about various Powders.)
Bullet is .458" diameter. Due to different barrel lengths, type of bullet, seating depth, primer type and other factors, you may not get near the FPS charted. It is just a guide and the reason you should start under these charges and work up.

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300 Barnes X
Lil'Gun 32.8 gr. 1,886
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300 Remington JHP
Lil'Gun 29.5 gr. 1,745
Lil'Gun 30.5 gr. 1,788
Lil'Gun 32.0 gr. 1,854
Lil'Gun 34.6 gr. 1,985 (very hot load)
H-110 34.8 gr. 1,645
W-296 33.5 gr. 1,772
H-4198 40.2 gr. 1,756
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325 Hornady FTX
IMR-4198 38.6 gr. 1,593
H-4198 38.8 gr. 1,604
Lil'Gun (use between 28.5 gr. and 30.0 gr. for ~1,700-1,800 fps category)
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(note: Matt's Bullets makes a 365 Grain Lead, Round Flat Nose + Gas Check (.458)
that should be experimented with if the flat nose does not create a feed problem)
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405 Remington JFP
Lil'Gun 28.9 gr. 1,594
H-110 34.4 gr. 1,657
HS-6 14.5 gr. 1,086 (quiet with a suppressor)
W-296 32.5 gr. 1,585
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420 Lead Cast RNFP + Gas Check
Lil'Gun 28.0 gr. 1,602
Lil'Gun 28.8 gr. 1,635
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500 Hornady RN
IMR-4198 26.4 gr. 1,066
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Discussion: * Most magnum pistol powders can be used as well as some rifle powders. The somewhat faster pistol powders are preferable for the lighter 300 grain range bullets, while slower burning powders work better with the heavy weights. However, case capacity can become an issue with bulky rifle powders. If I can find some loads with 2400, that might be a good experiment.

Hodgdon's Powder Guide on line and other internet sources. There is still a lot of experimenting with loads and blogs as of 2012 are the best source. You can back off loads. They may not work the action of the upper rifle, but you can work up in .2 grain increments to find what is best.
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