Newb Question: Difference between 55grn and 62grn?

[kentomatic]

I'm looking for cheap plinking ammo for my AR-15, and was wondering what the difference was between the 55grn and 62grn ammo? will both work the same through the AR?

[Pthfndr]

what the difference was between the 55grn and 62grn ammo? will both work the same through the AR?

7grn

Yes

[rksimple]

7grn

Yes

That about sums it up. Good luck and good night.

[StraightShooter]

7grn

Yes

Lol, straight and to the point.

[kentomatic]

yuk yuk yuk.

so more grain means what? bigger bang? both are ok in an AR?

[Harrison_Bergeron]

yuk yuk yuk.

so more grain means what? bigger bang? both are ok in an AR?

All I know I picked up from TV, but since no one is being serious...

More grains means more powder, which means more power. Yes, they will both work. I think you can go too low, but i imagine someone would have said so if that was the case here.

[rksimple]

All I know I picked up from TV, but since no one is being serious...

More grains means more powder, which means more power. Yes, they will both work. I think you can go too low, but i imagine someone would have said so if that was the case here.

It means a heavier bullet, not more powder.

[JeffM]

All I know I picked up from TV, but since no one is being serious...

More grains means more powder, which means more power. Yes, they will both work. I think you can go too low, but i imagine someone would have said so if that was the case here.

"Gr" is an abbreviation of "grains". Grains is a measure of weight. In this case it is the weight of the bullet itself. For the same diameter (ie the same caliber, in this case .224 inches or 5.56 millimeters) a higher weight bullet is longer and requires a barrel with a faster twist in the rifling to stabilize in flight.

The US military went from a 55gr Full Metal Jacket (FMJ) bullets with barrels of 1 twist for every 12 inches of barrel length (abbreviated 1:12) to 62gr FMJs with barrels of 1:7 twist. 1:9 is also popular. Military 62gr ammo designated M855 has a steel penetrator in its core.

All this can be found on the web if you search for it.

[Harrison_Bergeron]

I knew that, I was just posting misinformation so you guys would respond. Let that be a lesson.


Seriously though, from what I'd read I thought I had it, I probably never would have known until I bought an ish load of ammo that wouldn't work right with my gun.

[kentomatic]

The US military went from a 55gr Full Metal Jacket (FMJ) bullets with barrels of 1 twist for every 12 inches of barrel length (abbreviated 1:12) to 62gr FMJs with barrels of 1:7 twist. 1:9 is also popular. Military 62gr ammo designated M855 has a steel penetrator in its core.

does that mean my barrel with a 1:9 twist is fast enough to handle 62gr, or should i stick with 55?

thanks for all the info guys.

[jandmtv]

does that mean my barrel with a 1:9 twist is fast enough to handle 62gr, or should i stick with 55?

thanks for all the info guys.

your bbl will even handle 69 grain bullets with great accuracy. if you bbl is 20" or longer, it might even be able to handle 70-77 grain bullets also.

[C.G.]

does that mean my barrel with a 1:9 twist is fast enough to handle 62gr, or should i stick with 55?

thanks for all the info guys.

62 is fine, but be forewarned that surplus 62gr steel penetrator (M855 or SS109) is not allowed on most ranges.

[Jicko]

OR

go to the newbie thread..... (quoted in my signature)

OR

https://www.ammo-oracle.com

[Fjold]

There are 7000 grains per pound, 437.5 grains per ounce, 15.43 grains per gram.

[ar15barrels]

yuk yuk yuk.

so more grain means what? bigger bang?

It means the bullet is heavier.
The bang is the same.
They use less powder or slower powder when the bullet is heavier.