Ammo question


February 2, 2011, 05:48 PM
hey yall i know i might sound dumb when i ask this but just hang in there and tell me please. I have never understood why the 5.56 bullet has 55 grains of powder and the .30 cal Carbine bullet has 110 grains of powder. but the .30 cal carbine bullet is smaller than the 5.56 bullet. :confused:

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February 2, 2011, 05:56 PM
The .30 carbine bullet is bigger isn't it?

February 2, 2011, 05:58 PM
Uh? Say again, last; interrogative: What?

The FMJ .30carbine round has a diameter of 3/10 of an inch, about 7mm, but weighs 110 grains.
The 9original/typical) FMJ 5.56mm round has a diameter of 5.5mm, about 0.22" and it weighs 55 grains.

A "grain" comes from old measurement standards and refers back to the weight of mustard or barley grains. It's very close to 65grams; it's 1/7000 of a pound.

The powder charge behind the projectile can vary based on the powder type.

February 2, 2011, 05:58 PM
Ok when they list 55gr 5.56 ammo they are talking about the bullet weight not the amount of powder it has. The bullet weighs 55gr. It could have different amounts of powder depending on what company or person loaded it. Usually it would be in the 23-26gr range.

A 30carbine that is listed as 110gr has a 110gr bullet. I am not familiar with loading it so I could only guess as to how much powder it uses. Not 110gr though. Not even magnums carry that much- at least none I have loaded.

February 2, 2011, 06:00 PM
the business end of it is but its still a shorter jacket than the 5.56

February 2, 2011, 06:03 PM
I am not sure what the question is but I think your confusion is 5.56 is in millimeters and .30 cal is in inches so if you convert .30 to millimeters you get 7.62 for the .30 cal

February 2, 2011, 06:03 PM
thanks man. it just didnt seem to add up with the size of the bullets. :banghead:

February 2, 2011, 06:04 PM
i was askin bout the amount of powder in both bullets but now i understand. thanks yall

February 2, 2011, 06:05 PM
the business end of it is but its still a shorter jacket than the 5.56


February 2, 2011, 06:21 PM
Pants, I think he's referring to the casing when he says "jacket."

Which will be true, .30carbine is a 33mm long case, so, it's most of 12mm shorter than the 5.56x45 (or the 5.45x39 for that matter).

Wow, wiki makes me smart--.30 carbine is a .308" round (7.8mm) with a case capacity of 14gr water (0.92874 cm³)

5.56x45 is round of 5.70 mm (0.224 in) diameter, case capacity of 28.5 grains H2O(1.85 cc)

February 2, 2011, 06:32 PM
A typical 30 carbine load would contain around 12-16 grains of powder with a 110gr bullet. A 223 would have somewhere around 20-27 grains with bullets ranging between 35-80 grains.

The 30 carbine velocity is around 2000 fps while the 223 will be around 2800-3400fps depending on the load.

February 2, 2011, 06:43 PM
wiki makes me smartYes, it can do that for anyone capable of a basic google search.

Crosby67ss, wikipedia has quite extensive information on most common ammunition, including dimensions, common commercial loads and their velocity, weights, case capacities, parent cartridges, similar cartridges, common guns using the rounds, metric/US conversions and most alternative names, pictures, etc etc.

But first I think you may need this:

February 2, 2011, 07:17 PM
Grains are a unit of measure for weight, not physical grains of powder. In reference to loaded ammunition, the grain weight is specifying the weight of the projectile. The powder load varies by manufacturer and is not advertised.

1 gram = 15.4323584 grains according to Google.

February 2, 2011, 07:59 PM
aite thanks yall. now i is a little bit smarter. lol

February 2, 2011, 08:13 PM
check out the firearms section, the rest can be learned from a reloading manual. The lyman 49th edition is a good firearm reference, even if you have no plans to reload.

February 2, 2011, 08:28 PM
So much confusion..... I think you might wanna read up as the otheres have been saying...:confused::confused::confused:

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