Thread: 6.5 v 7mm

Hi guys...I use a 284 and send the 162 eldm off at about 2770. I was just running the numbers on the 147 eldm and launched at 2700 it has slightly more velocity and about 100 foot pounds less getting out there, about 2000fps at 600 yards.
Question is, two frangible projectiles about the same velocity and energy, how much difference to killing power does the smaller hole make?

I think the difference is immaterial so long as you stick the bullet in the right place. But a 6.5mm projectile has an area of 0.35cm2 whilst 7mm is 0.41cm2. That's a 17% increase in the size of the hole that the 7 makes. Not sure how else you could quantify the difference. Standby for many anecdotes.

Originally Posted by Pommy

I think the difference is immaterial so long as you stick the bullet in the right place. But a 6.5mm projectile has an area of 0.35cm2 whilst 7mm is 0.41cm2. That's a 17% increase in the size of the hole that the 7 makes. Not sure how else you could quantify the difference. Standby for many anecdotes.

And you would think a 17% wider wound channel, I wonder if that's less important with frangible projectiles.

shit loads of difference....you can shoot animal with your 7mm projectiles but you cant buy any 6.5mm ones to use.

Originally Posted by Micky Duck

shit loads of difference....you can shoot animal with your 7mm projectiles but you cant buy any 6.5mm ones to use.

Other way around Micky. There's plenty of 6.5 140 & 147 ELDM on the shelf, its the 7mm that's suffering the most.

Anyway to the OP, 6.5 all the way....just coz, rest is all academic

Originally Posted by Micky Duck

shit loads of difference....you can shoot animal with your 7mm projectiles but you cant buy any 6.5mm ones to use.

Way more 6.5mm around

Best thing to do is ask the deer. Those that were shot and ran and died with the 6.5mm compared to the the ones hit with the 7mm. The ones who say they died quicker the are the ones to listen too and get the caliber the that caused it. Or look at each caliber and see what one can't do what the other does. Using 140/150 gn projectiles, there's not much in it in real life. Only on paper. 7mm gets you into tge 180/190 class if you think you need it.
Me 7mm. It can load down to 6.5 performance and up in weight if needed. And very common. Really you cant go wrong with either.

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If you're researching buying one or the other the real option is to split the difference and get the mighty .270, the king of calibres for almost 100 years.

mate......the size of the hole will be stuff all diferent...unless it pencils and even then it will still be the same... frangible is what it is,explody and fly apart... too long and both will tumble at times,too slow and both will not open properly,too fast and both MIGHT be too explody .
and there is such a huge variety of cases to poke them out of,its not apples with apples unless same parent case eg .260 and 7mm/08 nothing is relevant if yo ucant get projectiles in first place...there is the 6 and a bit .257 and the only TRUE 7mm the .277 to also consider....

Originally Posted by Micky Duck

mate......the size of the hole will be stuff all diferent...unless it pencils and even then it will still be the same... frangible is what it is,explody and fly apart... too long and both will tumble at times,too slow and both will not open properly,too fast and both MIGHT be too explody .
and there is such a huge variety of cases to poke them out of,its not apples with apples unless same parent case eg .260 and 7mm/08 nothing is relevant if yo ucant get projectiles in first place...there is the 6 and a bit .257 and the only TRUE 7mm the .277 to also consider....

I have the 284 for hunting and a 6.5x55 for paper (and the eldms for both), I've always been skeptical about the 6.5 at distance but I was surprised by the numbers. Outside the size of the wound channel, they are pretty much equal on paper out to a long way (assuming similar expansion) and the 6.5 does it with about 30% less recoil.

Originally Posted by Fisherman

I have the 284 for hunting and a 6.5x55 for paper (and the eldms for both), I've always been skeptical about the 6.5 at distance but I was surprised by the numbers. Outside the size of the wound channel, they are pretty much equal on paper out to a long way (assuming similar expansion) and the 6.5 does it with about 30% less recoil.

Don't tell everyone about 6.5!
Must say the 168eldm 308 do the trick as well.
When I went to buy my first rifle I quizzed my guru hunting mate and his advice was if your going to put a hole in it make it a big one.
So bought an old Mauser Fiberglass stock 30-06 and no cans in those days!
Talk about recoil!
To be fair shot placement is the big one and not over stepping the chambering and your ability.
It takes years to master the above 3!

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Originally Posted by Micky Duck

and the only TRUE 7mm the .277 to also consider....

@Micky Duck can you expand on this?

Wondering what you were talking about as I had always taken the box figures for granted e.g. 7mm/.284 I took a look at my wall conversion chart. And what do you know, 7mm is 0.2756". SO measuring a 7mm/.284 ELDX with the verniers comes in at 7.17mm/.2820 and a .270 NBT is exactly 7mm/0.2755. So now that my mind is blown, what is up with the naming? or measuring system seeing as they don't actually convert? Also, by the chart 5.56 is not 0.223" yet 7.62 matches 0.300".

Curiosity got the better of me and I had to know.

https://en.m.wikipedia.org/wiki/Caliber

I’ve been back and forth about a 100 times and now back at 7mm and still don’t know , watching with interest cheers


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Originally Posted by buzzman

I’ve been back and forth about a 100 times and now back at 7mm and still don’t know , watching with interest cheers


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The for sale threads prove it.... I'd be going with what projectiles you can get your hands on, if you have a stash of both (lucky bastard) second hand rifles of both calibres will start showing up as folks run out of their own projectiles