Sectional density won't be nearly as much of a factor as bullet construction.The tsx,original x, and the failsafe easily out penetrate cup and core bullets or even partitions that are much heavier in weight.The tsx,original x and failsafe are not available in 220gr in .308".
30-06 vs 7mm rem mag
- Thread starter true north
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Sectional density won't be nearly as much of a factor as bullet construction.The tsx,original x, and the failsafe easily out penetrate cup and core bullets or even partitions that are much heavier in weight.The tsx,original x and failsafe are not available in 220gr in .308".
on the topic of penetration, there is more to it than meets the eye. My .375 H&H launching a 270gr TSX at 2700fps penetrated less than 1" more than a 160gr XLC at 2900fps out of my 7mm RM in wet/dry newsprint. Both were shot into the same block media at 90 yards. Mind you the test media was very dense, so the difference does equate to something, but it was not nearly the result I expected. The .375 TSX didn't open up very well, and the overall diameter was virtually identical to the 7mm! What's my point? If you want to know what happens, you have to try it out and see!
As a side note, the 7mm 160gr TSX out penetrated the .375 when the latter was used with 285gr Grand Slams at 2700fps, the 270gr Hornady SP (not chronographed) and the 300gr Sierra BT (not chronographed).
As a side note, the 7mm 160gr TSX out penetrated the .375 when the latter was used with 285gr Grand Slams at 2700fps, the 270gr Hornady SP (not chronographed) and the 300gr Sierra BT (not chronographed).
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Take a needle and drive it into a piece of cardboard, then take a pencil and do the same. The needle will penetrate deeper. So the test is invalid.
Now the real deal is the frontal mass of the bigger cal. The reason why you don't see 300 ultra used instead of a .458 in Africa.
Frank
When using expanding bullets the only frontal mass that is important is the frontal mass as the bullet expands.Only when using solids is bore diameter a big issue.And since non expanding bullets are illegal for big game hunting in most provinces,the unfired diameter of a bullet is not an issue at all.Below is link to a picture of a recovered bullet fired from a 300ultramag.The expanded diameter is .800" or nearly double the diameter of an unfired .458" bullet.By the way the 300 magnums are very commonly used in Africa for many species.
http://i34.photobucket.com/albums/d128/stubblejumper11/PA050015.jpg
Levi Garrett said:).
Take a needle and drive it into a piece of cardboard, then take a pencil and do the same. The needle will penetrate deeper. So the test is invalid.
Now the real deal is the frontal mass of the bigger cal. The reason why you don't see 300 ultra used instead of a .458 in Africa.
Frank
Yes Frank, but the .375" TSX opened up to the same diameter as the 7mm XLC, so it wasn't exactly a pin vs a pencil. With respect to the other bullets, you must factor in momentum. The .375 has much more of it, and an object in motion wants to stay in motion. The thing is that the conventional bullets shed weight and loose momentum faster. The "wound" channel was also larger on the conventional .375" bullets than the .375 TSX and the 7mm XLC. But remember, the question was will a 220gr .308 penetrate more than a 175gr .284"? My point is that there are other variables as well. One of which is whether or not the bullet is operating outside its design parameters. Sectional density is not the be-all end-all of penetration. That's the way I see it.
BTW, Gatehouse's buddy flattened a big grizzly with a 7mm RM and 160gr Barnes X.
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- Hillbilly shack in the boonies
Ya I see what you mean, and todays bullets are a whole different ball game. Its hard to find a bad one in the premium line.
Frank
Frank
I like the 7RM better all around than the '06. But my current favourite is a .308 Tikka. Handy and light, fun to shoot.
Anyhoo, if Germany had won WWII we'd be comparing the 8mm Mauser vs the 7RM because the '06 would have become obsolete in 1945!
Anyhoo, if Germany had won WWII we'd be comparing the 8mm Mauser vs the 7RM because the '06 would have become obsolete in 1945!
