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.

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

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.

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.

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’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

It not the size of the hole, it's the temporary wound channel where the difference is. The 7mm will kill faster

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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You know you really want a 6.5

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Looking at Reloaders website at the moment. 6.5mm projectiles basically spoilt for choice. 7mm different story.

Its academic really, there is no degree of dead....

Originally Posted by 25/08 IMP

You know you really want a 6.5

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Haha don’t get me thinking


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Originally Posted by Fisherman

Question is, two frangible projectiles about the same velocity and energy, how much difference to killing power does the smaller hole make?

I've reached the conclusion that the differences when shooting similar bullets of similar energy and velocity, of either 6.5mm or 7mm, are inconsequential.... a zero noticeable difference in the hunting field.

Yes, the .284 has 17 percent more cross-sectional area than the .264. That’s not insignificant... but against the surface area of a deer, I’m having trouble seeing how this is going to make a significant difference, especially when you consider the bullet’s frangible expansion, tearing, break-up, and tumbling in game.

Were we discussing solid bullets, the larger diameter of the 7mm would probably start to matter, but even then, a 0.5mm wider one? 0.5mm is so close that this difference in changing the outcome of a shot even with a solid bullet is rather unlikely.

It's bullet placement and bullet design (classic, bonded, partition), that are more important than diameter. Shot placement and bullet design are the keys, not some 0.5mm wider bullets.