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  #11  
Old 11-14-2014, 10:57 AM
firescout firescout is online now
 
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One thing I have noticed: I shot the American Eagle 150 gr FMJBT ammo side-by-side with my handloads of 47 gr of IMR4895 under a Hornady 150 FMJBT bullet. The factory ammo had slightly more recoil, compared with the handloads. Not much more, but it was noticeable.
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  #12  
Old 11-27-2014, 11:27 AM
NMC_EXP NMC_EXP is offline
 
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Quote:
Originally Posted by 7.62 Nitro Express View Post
Despite all of the doomsday chatter about "modern commercial ammo" it is interesting to note that the current muzzle velocity specs for 150 gr. 30-'06 ammo listed on manufacturers' websites is actually LESS than what was published by the same manufacturers in the 1950's.
Muzzle velocity is not the parameter of concern regarding ammo damaging a gas gun. Port pressure is the concern.

There is no reason to believe that if two ammo types have the same velocity, then the port pressure is the same.
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  #13  
Old 11-27-2014, 01:31 PM
rcolarco rcolarco is offline
 
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Quote:
Originally Posted by firescout View Post
One thing I have noticed: I shot the American Eagle 150 gr FMJBT ammo side-by-side with my handloads of 47 gr of IMR4895 under a Hornady 150 FMJBT bullet. The factory ammo had slightly more recoil, compared with the handloads. Not much more, but it was noticeable.
Your handload is a couple of grains below "milspec duplication" for the M1. Most (not all by any means) commercial ammunition is loaded to higher velocity than military ammunition, if published specs are to be believed.
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  #14  
Old 11-28-2014, 09:57 AM
Random Guy Random Guy is offline
 
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For anyone curious, I note that Federal/American Eagle ammo offers a unique comparison re this topic: They sell one "regular" 30-06 load and one "made for M1 Garand" - both use the same 150 FMJ round. The only visible different is that the brass for the M1 ammo is marked "M1" on the case head - kind of neat, me thinks.

Front of both boxes:


Part # "AE3006N" is generic 30-06 ammo
Part # "AE3006M1" is "made for M1 Garands"


Part # "AE3006N" is generic 30-06 ammo: Muzzle velocity is 2910 fps, energy is 2820 ft-lbs
Part # "AE3006M1" is "made for M1 Garands": Muzzle velocity is 2740 fps, energy is 2500 ft-lbs.
]

So, Federal/American Eagle "downloads" their M1 Garand ammo by approx 6% in initial velocity, and 11% in initial muzzle energy. I have no idea about differences on powder burn rate b/t these two rounds, but one can assume that Federal felt it was warranted to release a specific, slightly downloaded round for the M1 Garand, with a suspect a powder that falls into the "medium" burn rate. I'm sure they did proper scientific/lab testing, and possibly founds these "M1 Garand" rounds either 1) closely duplicate the original M2 ammo re velocity and port pressure, and 2) possibly functioned better with a gas piston/gas port system of the M1, and thus be less likely to potential wear/bend the longish op rod on an M1 Garand.

FWIW: Federal/American Eagle did the same thing re a special "M1A" 308W load with 168 bullet, but I don't have their "regular" 308W for comparison.

(Bullet is a 168gr OTM, and initial velocity is 2650 fps, initial energy is 262- ft-lbs.)

Last edited by Random Guy; 11-28-2014 at 02:43 PM. Reason: typos & added pics
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  #15  
Old 11-28-2014, 02:46 PM
NChick NChick is offline
 
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Default Then again ...

Interestingly, looking at the port pressure plots on Garandgear.com (no affiliation), one notices that the curves for the American Eagle "regular" 150 grain .30-'06 load and the M1 specific 150 grain load are nearly identical, the M1 round plot actually a hair higher:





Go figure.
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  #16  
Old 11-29-2014, 02:36 AM
moose moose is offline
 
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Remington Core Lokt 150 grain has been shown to pretty much even match USGI ammo pressures.

On the other hand..... Fiochi 150 grain was one of the highest.
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Last edited by moose; 11-29-2014 at 02:38 AM.
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