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Milsurp OAL vs SAAMI OAL |
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Sawbones ![]() On Point ![]() Joined: Mar 04 2022 Location: Texas Status: Offline Points: 138 |
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SAAMI rationale for OAL of 1.680? Any ideas? Could it have something to do w/ the lands? Some sort of pressure deal?
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Matt_X ![]() Grunt ![]() ![]() Joined: Nov 10 2020 Location: Phila, Penn Status: Online Points: 693 |
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Answer:
quoted from CMP forum https://forums.thecmp.org/showpost.php?p=258647&postcount=12 We see velocity discussed in documents related to the cartridge development and changes. This is probably velocity at 78 feet from muzzle.
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floydthecat ![]() Hard Corps ![]() Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1811 |
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Must also consider the longest round that would fit and feed from the magazine. I guess it depends from which end they designed for, the action length or the cartridge length. If they went from action length, one has to consider the oal of the round that will fit the magazine. They could have easily made the chamber longer than 33mm, but the action would have to fit the oal.
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New2brass ![]() Moderator Group ![]() ![]() Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4324 |
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@Sawbones, What carbine and serial range are you using?
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Sawbones ![]() On Point ![]() Joined: Mar 04 2022 Location: Texas Status: Offline Points: 138 |
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So sorry for the late response. For reason unknown the Forum is not alerting me of replies. Quality Hardware 1,583,8XX I think this one was a Closet Queen. Obviously sat in a closet somewhere since 1943 birth. Stock is beautiful walnut w/ few handling marks and all working parts show little wear.
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You can't fool all of the people all of the time.....but it isn't necessary. Will Rogers
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New2brass ![]() Moderator Group ![]() ![]() Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4324 |
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In the links below we discussed that the barrel chamber was changed in June of 1943. Basically from that point on all ammunition on hand was reserved for stateside and the new profile ammunition went to the theaters of operation. The new ammo worked in early and late barrels, but the old ammunition may have problems in the new barrels. In reality any new made ammunition should be to the latest standards, but if not held to the standard it is possible that there may be an issue in an early barrel. |
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Matt_X ![]() Grunt ![]() ![]() Joined: Nov 10 2020 Location: Phila, Penn Status: Online Points: 693 |
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I bought an unopened box of M13 Dummy cartridges made by Winchester Repeating Arms Co. lot 22038. Opening the box they are all stamped WRA * 44. Overall length 1.675" + .001" /- .002" Measured with vernier caliper. Sample size of 10 Standard deviation .0011" So far the military contract ammo is all within the drawing specs of 1.660 to 1.680" Case length measurements average 1.285" with std dev of .00158" Measuring the case length with the bullet installed probably reduces the consistance of my masurements using a caliper. |
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Matt_X ![]() Grunt ![]() ![]() Joined: Nov 10 2020 Location: Phila, Penn Status: Online Points: 693 |
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1971 Lake City 50-205 From an original box that was a bit beat up. Overall length 1.676" + .004" /- .003" Measured with vernier caliper. Sample size of 10 Standard deviation .0024" Average case length 1.283" |
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