Thread: 6.5 v 7mm

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

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 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.

@andyanimal31 is right about shot placement. For many years when I started hunting deer I just aimed at the chest area. As I gained experience I've learnt to pick the exact spot on the animal I want to hit. I was sighting in on paper and shooting MOA or less then going out and aiming at the big bit on animals.

I imagine that part of the 6.5 thing at distance is at what point it stops being frangible, then you would expect considerably slower killing. The PRC would move that distance quite a way out from the 450 yards I've seen the 6.5x55 being effective (shooting at the big bits).

Shoot to kill and the animals won’t know the difference. Since I bought my PRC earlier this year, I’ve shot 27 deer from 31 shots, from ranges 80m to 560m. The furthest any ran after being shot was 30m. My 7mm results were not much different if I recall correctly, although the hit/miss ratio has increased over the last 12 years of using it


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Originally Posted by JoshC

Shoot to kill and the animals won’t know the difference. Since I bought my PRC earlier this year, I’ve shot 27 deer from 31 shots, from ranges 80m to 560m. The furthest any ran after being shot was 30m. My 7mm results were not much different if I recall correctly, although the hit/miss ratio has increased over the last 12 years of using it


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Just got a message from a mate who put down a Sika at 700 yards with PRC (147eldm), be bloody cold up there this morning.

Originally Posted by Fisherman

Just got a message from a mate who put down a Sika at 700 yards with PRC (147eldm), be bloody cold up there this morning.

They punch above their weight

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Shot placement, shot placement, shot placement. 17% bigger hole 100mm off target makes 50% longer kill time. Of cause my stats mean nothing.
First consideration has to be can you shoot it accurately?

Currently having a 6.5 built, looking forward to it

First point is that in general cases for the 6.5 cal are smaller because grain for grain of powder they generate more pressure and more barrel erosion. So powder charge and kinetic energy are less than with the equivalent 7mm. Eg 260 Rem vs 7mm08. Its easier to build an accurate rifle in a lower power cartridge and easier to shoot it well.

The main thing is that for the same bullet weight you get better BC in. 6.5 which improves your probability for shot placement ( but only noticeable at > 300 m and if you use a rangefinder well).

Originally Posted by Bagheera

First point is that in general cases for the 6.5 cal are smaller because grain for grain of powder they generate more pressure and more barrel erosion. So powder charge and kinetic energy are less than with the equivalent 7mm. Eg 260 Rem vs 7mm08. Its easier to build an accurate rifle in a lower power cartridge and easier to shoot it well.

The main thing is that for the same bullet weight you get better BC in. 6.5 which improves your probability for shot placement ( but only noticeable at > 300 m and if you use a rangefinder well).

Recoil is massive for me for some reason, I get good results but it makes the preparation harder, zeroing, practice etc. I shot a sika hind at about 400 yards a while back with my mates 6.5x55 (143eldx @2700fps) and my only thought after letting it go was "no recoil", dropped the hind on the spot, I might work up a load and see where it goes.