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Old May 12, 2005, 08:16 PM   #9
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 10,247
Sundog,

I'd be interested to hear how your 2230 groups compare with 4895 or other standards through the same gun? Accurate Arms used to brag that 2520 was referred to as "Camp Perry powder". I haven't ever heard that at Camp Perry, but that's what their sales staff claims. My internal ballistics program has 2 grains less 2230 producing about the same chamber pressure as my 43.5 grain 2520 load. The summary is below:

Case, Fed .308, 55 gr. H2O cap., Fed. 210M primer, Sierra 168 gr. MatchKing seated to 2.800" O.A.L., 22" Bbl. Length.

AA2520
•43.5 gr. Charge Weight
•92.8% case Capacity Filled
•99.77% Burned in Barrel
•32.9% Balistic Efficiency
•51,849 PSI Peak Chamber Pressure
•7822 PSI Muzzle Pressure
•2604 FPS Muzzle Velocity

AA2230
•41.5 gr. Charge Weight
•88.5% case Capacity Filled
•99.42% Burned in Barrel
•33.1% Balistic Efficiency
•52,192 PSI Peak Chamber Pressure
•7435 PSI Muzzle Pressure
•2555 FPS Muzzle Velocity

You can increase the 2230 load about 0.8 grains and get to 2600 fps. This raises the peak chamber pressure about 3200 PSI, but that is still within SAMMI limits (this is PSI from a piezo-electric transducer, not CUP from a copper crusher, which gives a lower number in this cartridge), and only slightly greater than that produced by the Varget load I mentioned in my previous post. The 7520 PSI muzzle pressure is still below what the 2520 produces, which may help accuracy slightly with some bullets.

Anyway, how the groups compare is what I am curious to know, since I've never tried 2230?

Thanks,
Nick
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