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Milsurp OAL vs SAAMI OAL |
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Rebel92 
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Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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 Posted: May 20 2022 at 2:09pm |
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Awesome information. It’s amazing that ammo that old still shoots like it did yesterday! Thanks for sharing!
I for sure have one carbine that I am only able to shoot mil surp ammo out of, and i bet it’s because it doesn’t like the longer profiles of most commercial ammo or the fatter projectiles in the Armscor
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Sawbones
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Joined: Mar 04 2022 Location: Texas Status: Offline Points: 127 |
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Posted: May 20 2022 at 1:45pm |
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Matt: Chrony was 8 feet from muzzle
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When you are dissatisfied and would like to go back to youth, think algebra. Will Rogers
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floydthecat
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Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1749 |
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Posted: May 20 2022 at 1:14pm |
Expand a bit on why you consider the S&B crappy? It’s faster than the other stuff you tested. I shoot a lot of S&B in several calibers and in every case, it is hotter stuff. The 9mm is consistently warm at around 1260fps on average. Military grade stuff runs closer to 1300fps, but the S&B is right up there with it. I have never shot any 30-carbine S&B though. I just find S&B ammo to be warmer in the calibers I shoot it in and it’s not rated +p.
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Matt_X
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Joined: Nov 10 2020 Location: Phila, Penn Status: Offline Points: 659 |
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Posted: May 20 2022 at 1:07pm |
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Thank you! I for one really appreciate the velocities on both the historical and current ammo. How far out was the chronograph? |
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Sawbones
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Joined: Mar 04 2022 Location: Texas Status: Offline Points: 127 |
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Posted: May 20 2022 at 12:49pm |
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Floydthecat again I agree w/ you. The 1.680" OAL is the MAXIMUM OAL for the 30 carbine. I suspect anything longer may allow the bullet to encroach into the lands which causes other problems. To clarify: The SAAMI 1.680" OAL is not the standard OAL" for the 30 carbine cartridge; just don't go longer than 1.680". Trial and error OALs for your carbine to determine which OAL it likes. I'd begin at < 1.670". Again, all the 30cal milsurp I've measured was 1.665 +/- 0.002". All chambered beautifully in my USGI carbine. Incidentally: The Evansville 1944 WWII vintage ammo Chrony'd at 1,954, 1,931, 1,921 and1,925 feet/second which is a pretty tight range for any ammo. The Lake City 1952 Chrony'd at 1,963, 1,967, 1,929, 1,957 and 1,971 feet/second which is pretty tight. The Sellier & Ballott Chrony'd at 2,045, 2006, and 2,071 Which is pretty crappy when compared to milsurp.
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When you are dissatisfied and would like to go back to youth, think algebra. Will Rogers
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floydthecat
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Posted: May 20 2022 at 12:08pm |
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Not that unusual to hear about carbines with chambering issues using some ammo. There was a change in chamber dimensions early on, which likely contributes to the issue as well as varying bullet profiles. Sometimes SAAMI specifications can seem like a suggestion.
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W5USMC
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Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 2656 |
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Posted: May 20 2022 at 12:02pm |
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SAAMI= Sporting Arms and Ammunition Manufacturers' Institute
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Wayne
USMC Retired NRA Life Member |
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Sawbones
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Joined: Mar 04 2022 Location: Texas Status: Offline Points: 127 |
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Posted: May 20 2022 at 11:48am |
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SAAMI = Sporting Arms and Manufacturing Institute Had the opportunity to Chrony some milsurp ammo to compare w/ reloaded 30 carbine ammo of a fellow Forum comrade. The reloaded ammo OALs were all 1.672"-1.675" and every one of the rounds jammed when chambering; tip of projectile hanging up on the rim mouth of the chamber. Curiously the milsurp stuff, namely Evansville Cartridge Company 1944 and Lake City 1952 all measured 1.665 +/- 0.002" all chambering beautifully w/o 1 jam. Likewise the off-the-shelf Sellier & Bellot ammo OALs measuring identically to that of the milsurp. Observation: SAAMI recommended OAL for the 30 carbine cartridge is 1.680". Milsurp obviously much shorter at 1.665" +/- 0.002". My carbine will not chamber any cartridge OAL > 1.670" Seems reasonable to me the shorter OAL of the milSURP ammo is in reality the actual milSPEC (military specification) for the USGI carbine and the longer SAAMI OAL spec is standard for the currently manufactured non-USGI commercial 30cal carbines. Make sense? Perhaps if some of you are having chambering issues w/ longer OAL ammo you might consider a shorter cartridge. I can see where some of you may be rolling your eyes thinking "Where did this moron roll off the cabbage truck" but this is quite a revelation to me, solves my chambering issues so I felt compelled to relay this to other folks on the Forum.
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When you are dissatisfied and would like to go back to youth, think algebra. Will Rogers
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Sawbones wrote: