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Same Velocities with two different powders

 
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  #1  
Old 07-16-2008, 02:07 PM
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Same Velocities with two different powders

Shooting a 6x284 87gr V-Maxs. 53.5grs of H4350 produces 3650 with pressure signs.60.5grs of Magpro produces about the same velocity. But know pressure signs? Why? Does this have some thing to do with Chamber pressure vs muzzle pressure ? Tighter groups with Magpro also.
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Old 07-16-2008, 02:27 PM
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Different powder burn rate?
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Old 07-16-2008, 02:28 PM
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As an extreme example...Blue Dot in smaller calibers can produce high velocities with much less powder than usually used in these guns, aka, 223, 22-250, 243, etc.
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Old 07-16-2008, 02:33 PM
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Iron Worker:

Mag Pro has a slower burn rate.

Powder Burn Rates


1kstr
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Old 07-16-2008, 03:14 PM
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As mentioned, the slower burning powder is producing equivocal velocity but less pressure, even though it takes more of it in grains. Sometimes the slower burn rate will produce even higher velocities with the same or even less pressure.

This is very similar to a 30.06 using 4350 v. Reloder 22 for a 180 bullet. You can just about overfill the .06 case with Re22 and compress the load, and still have unremarkable pressures. Yet the 4350 may not even come close to the neck with a max charge and have noticeable pressure. Velocities can be very similar or noticeably different.
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