Bullet Performance Database

[Gomer]

I have never seen a partition seperate as pictured. Front separation yes but rear section never.

I’ve lost the rear lead core a couple of times with 210gr Partitions fired out of a 338. All i recovered was a mushroomed front with a hollow rear jacket.

 

[Daryl S]

Wondering if those 210's have a shorter back section compared to other weights.
Turning around after losing the front and expanding the opening might have that effect.

 

[MS 9x56]

Bullet tumbling?

 

[Daryl S]

Yeah, they do that, turning bass-ack-wards - sometimes. Have you never seen that, at least in GEL. tests?
The shorter the bullet becomes (it appears), the less stable it becomes in it's traverse through the animal and the more likely it will turn butt first.
Some bullets do that right away, if the ROT is on the slow spectrum for that length of bullet.
That happened most dramatically in Viet Nam, with the 55gr. FMJ's in a 12" ROT of the M16's.
It also happens to bullets losing too much length through sloughing off weight when penetrating in animals. It is likely this would not happen, EVER, with a .338", 225gr. or 250gr. bullet.
My long time friend (since 1972)and guide Igor, noted the fastest kills he had witnessed on Grizzlies was by a 225gr. .338 Win. Mag with the 225gr. Nosler, BANG/FLOP, DRT.

 

[TTundra]

I’ve lost the rear lead core a couple of times with 210gr Partitions fired out of a 338. All i recovered was a mushroomed front with a hollow rear jacket.

375 nosler partition separation, nose amd core. Found it laying sideways on the wildebeest.

 

[Daryl S]

WOW, I've not seen that before. Tks for the pictures.
You can see thr crimped base is expanded but the front end not.

 

[SkullKeeper]

Does anyone know the relative expansion difference between Swift A-frame and the equivalent North Fork? I ask because I believe the common wisdom is that the North Fork will penetrate further. So, I am wondering if the Swift frontal diameter is actually more

One thing of note and notice: most recovered A Frames have a swollen rear area directly under (behind) the copper bridge in the bullets center. This comes from the pressure exerted on the front half of the bullet by the rear section during penetration- the bullet is in essence loosing forward motion/energy by working against itself. A North Fork having a solid copper base will not shed energy this way. In theory the North Fork should penetrate farther than an A Frame grain weight for grain weight and given rate of expansion is equivalent.
On another point I’ve seen brought up here, there’s talk about lowering velocity to achieve better penetration as a result of lesser expansion. You have to keep in mind that the greater the velocity the larger the cavitation bubble. It’s somewhat of a double edged sword but personally I’ll take the higher velocity and greater expansion/larger cavitation bubble if I’m choosing to shoot soft nose bullets.

 

[Twraska]

One thing of note and notice: most recovered A Frames have a swollen rear area directly under (behind) the copper bridge in the bullets center. This comes from the pressure exerted on the front half of the bullet by the rear section during penetration- the bullet is in essence loosing forward motion/energy by working against itself. A North Fork having a solid copper base will not shed energy this way. In theory the North Fork should penetrate farther than an A Frame grain weight for grain weight and given rate of expansion is equivalent.
On another point I’ve seen brought up here, there’s talk about lowering velocity to achieve better penetration as a result of lesser expansion. You have to keep in mind that the greater the velocity the larger the cavitation bubble. It’s somewhat of a double edged sword but personally I’ll take the higher velocity and greater expansion/larger cavitation bubble if I’m choosing to shoot soft nose bullets.

I disagree with your first comment. Weight is weight and as long as the bulge doesn’t expand past the front, it don’t matter. The back is essentially in a void as it passes.