7 X 57 or 6.5 x 55 ?

[Ardent]

What edge are you talking about exactly?

Keeping in mind how many Elk sized Moose get harvested every year in Sweden with the 6.5 Swede.

Better, and heavier bullet selection is the edge he means.

 

[TimC]

Actually I'm going all imperial and snobby on you, none of that metric Boer muck for me, I shoot a .275 Rigby.
Go on let me have my moment, I know the truth!

 

[.Ben]

i say 6.5 sweede only cause i like it

 

[1899]

What edge are you talking about exactly?

Keeping in mind how many Elk sized Moose get harvested every year in Sweden with the 6.5 Swede.

RDP is a mathematical representation of the relative damage potential a bullet can inflict in the animal. Naturally it is an estimation, but the nice thing is that it considers the cross-section of a bullet, the weight and the velocity.

The formula is:

RDP = (bullet weight in grains x velocity in feet per second x frontal area of the bullet in inches) ÷ 7000.

A simplified version (because bullet weight in grains x velocity in feet per second ÷ 7000 = momentum)

RDP = (Momentum x frontal area)

Frontal area is (radius x radius x 3.143)

So then the RDP for the two, at 200 yards is:

7x57 175gr Partition at 2500 fps
RDP = 3.45

6.5x55 156 gr Norma Vulcan at 2550 fps
RDP = 2.55

That means the 7x57 has 35% higher relative damage potential.

 

[TimC]

That assumes of course that both impact the same place whilst game is stood the same way otherwise it is a worthless calc!

 

[1899]

That assumes of course that both impact the same place whilst game is stood the same way otherwise it is a worthless calc!

Of course, that is why it is relative to each other!

 

[nrut]

This thread has turned into comedy..

 

[Mount Sweetness]

Interesting formula, thanks for sharing!

 

[Calum]

That assumes of course that both impact the same place whilst game is stood the same way otherwise it is a worthless calc!

Or that game animals know math.

A bit more bullet mass, same penetration.

6.5 has better penetration, it's just harder to tell in Australia as kangaroos are rather narrow in comparison to an Elk.

 

[1899]

Or that game animals know math.

How else would they know when the season opens/closes?

 

[catnthehatt]

Is this a european version of 308 vrs 3006 ?
I'm a huge 6.5x55 swede fan but the answer for yourself maybe different.

More like a Euro version of the .280 versus '06...
Cat

 

[kombi1976]

How else would they know when the season opens/closes?

 

[Calum]

How else would they know when the season opens/closes?

Humans start to wear funny outfits that look like foliage.

 

[TimC]

Oddly enough I think all of the Mauser rounds were from about the same time, different countries tried different ways to win the small bore race all things considered and loathe myself for it the Mauser cartridges just had the magic that meant great performance then from 6.5 to 8mm with lets not forget 7.65 along the way and the ability to make the most from modern bullets and powders our of modern rifles. Its just the right maths and engineering meeting up without daft solutions to get there!