Sectional density and overall weight

[Ds J]

From https://www.marlinowners.com/threads/45-70-vs-458-in-penetration.16384/page-2?nested_view=1&sortby=oldest

"The whole thing is not 45/70 vs. .458WM.

The real question is:

When it comes to deep penetration into animal tissues, is there a speed above which energy starts being wasted into displacing tissues upon impact, therefore resulting in less overall penetration?

I believe that the answer is yes. Every unbiased and properly set experiment I'm aware of goes into this direction."



(EDIT: PLEASE READ  THIS ^ THREAD!)

[Treeman]

I am still trying to find out if a lighter smaller caliber, say a .270 160 gr bullet with a high SD of about 310 at 2600 fps penetrate deeper than a 300 gr 458 with a much lower Sd of 210 at same velocity.  Will the 310 SD go deeper because of SD or will the 300 grain go deeper because of it being 300 grain versus 160 grain

[Ds J]

I am still trying to find out if a lighter smaller caliber, say a .270 160 gr bullet with a high SD of about 310 at 2600 fps penetrate deeper than a 300 gr 458 with a much lower Sd of 210 at same velocity.  Will the 310 SD go deeper because of SD or will the 300 grain go deeper because of it being 300 grain versus 160 grain

We shot a blueWB bull at 120m with a 308 Win, and 130gr Impala LWHV with approximately 2700fps at the muzzle. It went in at the "V" of the neck, and penetrated all the way through the body, getting stuck in the opposite hip bone. My guess is that it could have penetrated completely if it did not hit bone because the bullet was inbedded into the bone. Obviously, any 458 mono will achieve the same, being a mono.

The same shot with a 180gr Sierra Pro-Hunter at 2400fps usually do not penetrate as far, maybe 2/3 of the way.

A 458 Win Mag can push a Speer 400gr FP at 2400fps. I am pretty sure that it would shoot lengthwise through a large antilope like a blueWB.

A 458 Lott can almost reach 2300fps with a 500gr, and 2574fps with a 400gr A-Frame. My guess is that a 450gr SP or FP bullet should reach 2450fps, on par with the 308 with a 180gr bullet. The 458 Lott will most definitely outperform a lighter 308 or 270 bullet.

Interestingly enough, a friend of mine shot a lion at 40m, broadside on, breaking both shoulders. He used a 416 Rem with a 400gr Hornady DGX bullet. The bullet penetrated the carcass, but was stuck beneath the skin on the opposite side. The PH said it was normal with lions, due to the density of the muscles.

[Againstthegrains]

So if you look at it this way. All metal spheres have the same SD. If you drop a 1kg sphere or a 1g sphere from the same height onto a plank of wood, they will impact at the same speed, but the 1kg metal sphere will do a lot more damage because it has a lot more energy to act on the wood. Hence a heavier bullet will do the same to the meat.

[Treeman]

So if you look at it this way. All metal spheres have the same SD. If you drop a 1kg sphere or a 1g sphere from the same height onto a plank of wood, they will impact at the same speed, but the 1kg metal sphere will do a lot more damage because it has a lot more energy to act on the wood. Hence a heavier bullet will do the same to the meat.

*******************************************
THATS WHAT I WANTED _ NEEDED, could not format that myself. So we can conclude that a heavy 500 gr poor Sd bullet will by nature of its heavier nature penetrate deeper, greater momentum, carried energy, than the high SD 6.5 Creeds 130 gr bullet.

  Correct?


 

[Ds J]

So if you look at it this way. All metal spheres have the same SD. If you drop a 1kg sphere or a 1g sphere from the same height onto a plank of wood, they will impact at the same speed, but the 1kg metal sphere will do a lot more damage because it has a lot more energy to act on the wood. Hence a heavier bullet will do the same to the meat.

*******************************************
THATS WHAT I WANTED _ NEEDED, could not format that myself. So we can conclude that a heavy 500 gr poor Sd bullet will by nature of its heavier nature penetrate deeper, greater momentum, carried energy, than the high SD 6.5 Creeds 130 gr bullet.

  Correct?


 

Generally, it should be the case, but not always. Bullet speed, bullet construction,target medium etc play a role.