Posted: 3/22/2011 5:59:39 PM EDT
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OK Hive, I know this must be a dupe. Bullet dia. for the 5.56x45 is .224 which converts to 5.6896 Bullet dia. for the 5.45x39 is .22 which converts to 5.588 WTF Why 
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The nominal groove to groove diameter on 7.62x51 is .308. The nominal land to land measurement is .300. .308 x 25.4 is 7.82. .300 x 25.4 is 7.62.
If you look at the drawings for both .223 and 5.56, the pilot diameter (land to land) is either .218 or .219. .218 x 25.4 is 5.537 and .219 is 5.5626 or (insert drum roll) 5.56. |
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It's better to just think of them as names. It's not like the Porsche 944 was bigger than the 928, 935, 912 or 911. Wait til he starts trying to figure out blackpowder cartridges. .38-40 uses .40 caliber bullets, for starters. Yup. Some are logical, others, not so much. It's probably "about" .38 land-to-land. IIRC, .44 cap and ball revolvers use .45x balls and bullets. Oh, and .307 is a .308 with a rim, 5.7 is really 5.56, which it really isn't... AAAARRRRGGGGHHHH!!! |
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It's better to just think of them as names. It's not like the Porsche 944 was bigger than the 928, 935, 912 or 911. Wait til he starts trying to figure out blackpowder cartridges. .38-40 uses .40 caliber bullets, for starters. Yup. Some are logical, others, not so much. It's probably "about" .38 land-to-land. IIRC, .44 cap and ball revolvers use .45x balls and bullets. Oh, and .307 is a .308 with a rim, 5.7 is really 5.56, which it really isn't... AAAARRRRGGGGHHHH!!! It isn't that hard; back in the day the .38-40 used a heel-based bullet (like today's .22 a plug base is in the case and a lead skirt covers the top of the brass) that measured .400. That skirt expanded to fill the bore to prevent gas blow-by. Buy a copy of Cartridges Of The World. Very instructive in matters like this. |
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and 50 BMG is 0.51"  .460 Weatherby is .458. They called it a .460 to make it sound like a bigger gun. I've seen claims that .700NE measures .670 or .690, but it doesn't. The .700 round I had in my collection had a bullet diameter of .700". Plus the fact that .303 British uses .310-.312 bullets(like most European .30 caliber rifles). |
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OK Hive, I know this must be a dupe. Bullet dia. for the 5.56x45 is .224 which converts to 5.6896 Bullet dia. for the 5.45x39 is .22 which converts to 5.588 WTF Why How cartridges got their designations, is one of those things I wouldn't spend much time researching or thinking about. If you are interested in reloading, get a couple books and read them. That is where you will get the majority of useful information. |
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Just like American .30 cal is .308 Diameter and international .30 call is .311
OK Hive, I know this must be a dupe. Bullet dia. for the 5.56x45 is .224 which converts to 5.6896 Bullet dia. for the 5.45x39 is .22 which converts to 5.588 WTF Why and that really makes reloading for commie guns a PITA |
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OK Hive, I know this must be a dupe. Bullet dia. for the 5.56x45 is .224 which converts to 5.6896 Bullet dia. for the 5.45x39 is .22 which converts to 5.588 WTF Why As others have said, bore diameter, not groove. Quoted:
Same goes for a bajillion other chamberings.
That and stuff like .38 Special fits in .357 Magnum revolvers and all that jazz.
I believe that's because in the early days .38 caliber bulllets really were .38 caliber when they used healed bullets. |
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40 Caliber S&W is .400" but 10mm is 10.16mm 357mag is .357 but so is 38. My favorite is 44mag coming it at .429" That one is interesting too... .44 American, healed bullet, .44" diameter bullet and casing. Evolved into the .44 Russian, using a .430" lead bullet (.429" groove), not a healed bullet. Evolved into the .44 Special, which evolved into the .44 Magnum. And that's why the .44 Magnum, using a .429" bullet and a .45something" case became the .44 Magnum. |
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It's better to just think of them as names. It's not like the Porsche 944 was bigger than the 928, 935, 912 or 911. The 944 had a 2.5, 2.7 or 3L engine depending on year made with a 94.5 in. wheel base while the 912 only had a 1.5 or 2L engine and a wheel base of 88.8 in. The 944 was bigger then the 912 in all ways and bigger then the 911 type classic air cooled cars (911S, 911T, 911SC, 930, 934, 935, 964) in size and weight. 
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The Chevy Camaro Z28 came with a 2.8L V6 engine when introduced
The Lumina/Beretta Z34 came with a 3.4L V6 But the Cavalier Z24 came with the 2.8L V6 until 1991, where it had a 3.1L V6 until 1995, at which point it had a 2.3L, and 1996 when it got the 2.4L I4 that it carried until they stopped that badging in 2000... |
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Which is why all the gun store commandos in Viet Nam could shoot the enemy's AK-47 ammo in their M-16's with no problems. It was all .30-30 anyway. 
was there EVER a case of one could shoot the other's ammo or vice versa? That line of bullshit had to come from somewhere. |