9mm 147gr vs 115gr Question

[ngnrnlo]

I disagree, the 147 gr bullets, all other things being equal, consistently achieve better penetration than the 124gr and most certainly better than the 115 gr. And less "over penetration" . Idea;ly, you want the billet to remain in the target to dump all its energy in the threat.

[SnWnMe]

*laughs in to his G29*

https://www.underwoodammo.com/collections/handgun-ammo/products/10mm-auto-115-grain-xtreme-defender?variant=18785704607801

TECHNICAL INFORMATION
Caliber: 10mm Auto
Bullet Weight: 115 Grains
Bullet Style: Lehigh Defense Xtreme Defense
Case Type: Ducta-Bright 7a Nickel Plated Brass
BALLISTICS INFORMATION
Muzzle Velocity: 1700 fps
Muzzle Energy: 738 ft lbs
Penetration:18 inches

[OCEquestrian]

Google is your friend "controlled penetration ballistics"

There are three basic classes of bullets:

Those designed for maximum accuracy at varying ranges
Those designed to maximize damage to a target by penetrating as deeply as possible
Those designed to avoid over-penetration of a target, by deforming to control the depth to which the bullet penetrates, which as a by-product, deals more damage inside the wound
The third class may limit penetration by expanding or fragmenting.

[AFTII]

*laughs in to his G29*

https://www.underwoodammo.com/collec...18785704607801

There is LOT of hype over that ammo. I used to believe it - until I really tested it. Yes, it does chronograph at 1500 fps - out of my KKM barreled G20 and stock G40. However, its penetrating qualities are vastly over rated. One of the internet claims is that it will penetrate body armor. To test this claim, I took a 20+ year old Point Blank kevlar vest out to the desert. I dressed my rubber dummy with the vest and shot him 10 times with a G40. None of the rounds penetrated the vest. (If it really did penetrate body armor, the ATF would yank it in a heartbeat.)

[McTrigga]

Here's you question answered exactly at 5:17 : This is not gay porn...trust me. lol

[ar15barrels]

Better penetration and “less overpenetration”?

The heavier bullets dump all their energy without leaving the target body.
The lighter/faster bullets carry more energy because of the velocity, but they fully penetrate the body so they don't put all that energy into the target.
The faster bullets leave the remaining energy in whatever they stop in such as the wall, ground, another person etc...

[SCVlongstroke]

I hope op had enough time to get ammo.

[WWDHD?]

I believe that the 147gr load is sub-optimal due to the heavy bullet taking up too much space in the shell - depriving it from holding more powder. The 147gr load is optimized more for suppressed firearms.

I personally favor 9mm in 124gr offerings (when I'm buying "new").

This is what has always made sense to me. Split the difference- at least as far as HD rounds go. For "large game"? IDK. Better than nothing I guess but far from ideal.

[el tardo]

[OCEquestrian]

It is very popular in the IDPA world for those reasons.

[OCEquestrian]

Better penetration and “less overpenetration”?

The heavier bullets dump all their energy without leaving the target body.
The lighter/faster bullets carry more energy because of the velocity, but they fully penetrate the body so they don't put all that energy into the target.
The faster bullets leave the remaining energy in whatever they stop in such as the wall, ground, another person etc...

Thank you for clarifying that for those who are Google challenged...

[Calvin36]

It is very popular in the IDPA world for those reasons.

Hmm didn't know this. Thanks for the info!

[Transient]

A great example of this would be to compare the snap you'll feel from a subcompact gun like a Glock 43 with a 115 grain bullet versus the 147 grain.

Sent from my SM-N960U using Tapatalk

[Beendare]

Wow there is some inaccurate info in this thread. All else equal, the heavier bullet will penetrate more.

But bullets have multiple designs;

There are three basic classes of bullets:

Those designed for maximum accuracy at varying ranges
Those designed to maximize damage to a target by penetrating as deeply as possible
Those designed to avoid over-penetration of a target, by deforming to control the depth to which the bullet penetrates, which as a by-product, deals more damage inside the wound
The third class may limit penetration by expanding or fragmenting.

Winner winner.

The Underwood penetrators did not out penetrate a heavy hard cast wide me plat bullets in the tests I've seen. I don't know what 147 gr ammo that is...but its not hard cast.

The design of the 115g over penetrators is;
1) rounded for perfect feeding in a semi auto (Not all semi autos shoot the wide meplat hard cast bullets well)
2) designed to create cavitation in the wound channel- supposedly more damage that way.

So back to physics 101, heavy penetrates better. The Wide meplat hard cast bullets are a proven winner on defense of dangerous game. [Ammoland has a study of something like 80 incidents]

a 9mm with the right ammo is a pretty good option. Of course, bigger is better but when it comes down to accuracy under pressure....can you really get off 2 or 3 well placed shots with a 454 Casul on that 1,000# Brown bear charging you in the willows?

Moving targets, under extreme stress....a guy shoots what he is good with. That hand cannon is no good if you can't draw and get off a couple good shots in 3 seconds.

The one thing we know about animal charges- when it happens, it happens fast.

Personally, when I'm bowhunting the Alaskan islands...or MT, WY -with the big bears, I'm packing a 10mm with Underwood 200gr hardcast, They are tried and true perfect function in my stock G20SF- not one hiccup. Everywhere else, I pack my 9mm Shield with BB hard cast.

Now shooting humans...none of that^ matters. Get a good controlled expansion bullet and done.

___

[rodralig]

Google is your friend "controlled penetration ballistics"

There are three basic classes of bullets:

Those designed for maximum accuracy at varying ranges
Those designed to maximize damage to a target by penetrating as deeply as possible
Those designed to avoid over-penetration of a target, by deforming to control the depth to which the bullet penetrates, which as a by-product, deals more damage inside the wound
The third class may limit penetration by expanding or fragmenting.

Learned something today...




_