JHP vs FMJ


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CarolinaJack88
May 4, 2011, 12:34 AM
How do the ballistics differ between a jacketed hollow point round and a standard FMJ? Specifically in small caliber rifles like the .22 lr, out at some distance, like 50 yards.

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PTT
May 4, 2011, 12:40 AM
Bullet flight or terminal ballistics?

JohnBiltz
May 4, 2011, 01:41 AM
Its always best to zero with what you will be shooting.

MachIVshooter
May 4, 2011, 01:50 AM
With .22 Rimfire at that range, the quality of the firearm and ammunition are going to have a lot more effect on accuracy and POA/POI than bullet type.

If you're talking the ability to do damage, the HP will cause more for obvious reasons. That follows with any HP that is designed to expand.

shotgunjoel
May 4, 2011, 02:04 AM
I'd guess that the more rearward center of mass of the FMJ is going to be your biggest difference. And as a side note, I don't think that there is any jacketed 22lr on the market.

CarolinaJack88
May 4, 2011, 02:00 PM
Shotgunjoel, I think you're right. Just a slip on my part.

I'm talking about bullet flight. I guess my question was that since a hollow point has a hollow point does it drop off quicker or fly differently from a standard round?

shotgunjoel
May 4, 2011, 02:14 PM
I'm talking about bullet flight. I guess my question was that since a hollow point has a hollow point does it drop off quicker or fly differently from a standard round?
So what your asking is 'does the hole in the bullet cause major drag issues?' My answer to that would be no. The air that would go into the cavity would become compressed and almost "fill in" the hole, negating any drag that you are thinking of. Also, we have to remember that these bullets are moving very fast. Consider the debate over the rifling vains on Foster slugs. Some people say that it makes the slug spin in the air, while others say that the air forms a cone in front of the slug, and therefore doesn't make significant contact with the vains. I agree with the second group.

MachIVshooter
May 4, 2011, 03:05 PM
Consider the debate over the rifling vains on Foster slugs. Some people say that it makes the slug spin in the air, while others say that the air forms a cone in front of the slug, and therefore doesn't make significant contact with the vains.

And some know that the purpose of those veins is to allow compression through a choke.

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