Caliber, Bore Diameter and Groove Diameter Explained
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- Опубліковано 23 лис 2024
- There are lots of numbers thrown around when talking about calibers - where do they come from? Let's talk about it.
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Thank you for this video. Just ventured into my first .30 cal reloading adventure (300 PRC) and this answered things I'd been wondering about as I chose a caliber. BTW, loving my Zero press!
When I got into reloading I learned of the fact that "cartridge names" are simply brand names. I find it comical actually. For starters, I will state that 1 inch equals 25.4mm. This is a factor in doing the math between Standard and Metric systems.
ALL .22 cal bullets are actually .224, whether it's 223 Rem, 5.56 Nato, 22Lr, or even a 22 pellet gun. Those names for cartridges are simply that - just brand names for a patent or SAAMI specs.
Same goes for 30 cal (with a twist). 308, 300, 7.62 Nato are all the same, which is actually .308 inches or 7.62mm. "300" is a brand name. It is .308 or 7.62mm. 300 Win Mag, 300 WSM, etc are all .308 & 762. What's the twist? Well, Russians do things differently and the AK rounds are actually .310-311". Slightly larger. I have a Ruger Mini-30, and some of those are in both bore diameters (.308 OR .310). That's messed up, but they are different. I had to check my Mini-30 bore by sluggling it to find out the true bore diameter, which turned out to be .310. Yeah, that's messed up, but .308 bullets still work in a .310 bore - it's just not the perfect match.
Many pistol cartridges are the same size as well, like 380, 357, 38, 9mm, and others. Those are all .356" in diameter. All those names for cartridges are just "brand names" for selling on the market. It is misleading, but in reality things are much simpler than one might think. All those numbers can make one's head spin, but it's actually not complicated like it seems.
If anyone knows more about this and can correct me, then please don't hesitate to do so!
Thank you for the explanation.
why do some bullets work for barrel drop test and some dont but in the same calber .i have some remington and some federal and hornady for my 303 remington drop to the case almost .but federal and hornady have a 1/4 inche left great but remington the barrel looks worn out is it the type of bullet shouldering ??
Does the bullet gets compressed since bullet diameter is larger than bore diameter?
Thank you very helpful
Are caliber and bore different things or the same
That is explained from the very beginning of the video.
Can .308 be shot out of a .311
Will if affect accuracy much?
Can it? Probably. Should it? No.
Use the right components for your system.
Is the inner diameter of the barrel equal to the bullet diameter or the cartridge diameter?
Watch the video, we specifically discuss this in detail!
@@area419
I did but no conclusion on that point. could you answer me with yes or no?
@@pigboybig there is not a simple yes/no answer as both are used. It’s why we made the video!
Thank you
Dude you look like Jesse Pinkman
Helluva compliment for Mr. Pinkman there...
AND remember folks that 7.62 does not equal .308.
It does actually. 7.62 NATO and 308 use a .309 projectile diameter. The difference is with 7.62x39 which uses a .311 projectile diameter.
@@chrismckoy3533 No 7.62 equals .300 which is the bore diametre
Just like 6mm does not equal .243 - but the numbers generally refer to the same thing, as is explained in the video
why do some bullets work for barrel drop test and some dont but in the same calber .i have some remington and some federal and hornady for my 303 remington drop to the case almost .but federal and hornady have a 1/4 inche left great but remington the barrel looks worn out is it the type of bullet shouldering ??