6.5 creedmore and 7mm-08

[Mr Underbridge]

6.5 creedmore and x47 lapua are popular among the tactical rifle crowd, from what I understand works better int he wind and puts more energy on the target at long range compared to a 308 win.
I was comparing berger 7mm 168 gr bullet with BC of .316 to berger 6.5mm 140 gr with a BC of .317
Both are pretty much identical in BC.
Why is the 6.5 creedmore so much more popular than the 7mm offering?
Is the 7mm-08 case unable to generate enough FPS to actually get that BC of .316? and you can get that high BC from 6.5 creedmore because it CAN push the bullet fast enough to get that high BC?

 

[ShootDots]

6.5 creedmore and x47 lapua are popular among the tactical rifle crowd, from what I understand works better int he wind and puts more energy on the target at long range compared to a 308 win.
I was comparing berger 7mm 168 gr bullet with BC of .316 to berger 6.5mm 140 gr with a BC of .317
Both are pretty much identical in BC.
Why is the 6.5 creedmore so much more popular than the 7mm offering?
Is the 7mm-08 case unable to generate enough FPS to actually get that BC of .316? and you can get that high BC from 6.5 creedmore because it CAN push the bullet fast enough to get that high BC?

In one word "Horsepower"..To drive a heavier bullet like that at speeds that would make good use of it, you need a larger case. But as always, there is one little fly in that "ointment".. If you neck down 308 Palma brass and do a P.O. Ackley "improvement" and run VV N550 you could essentially exceed the Creedmoor offering. However, that is IF you are willing to run higher pressures (The Palma Brass CAN Handle it) and fireform into an A.I. Then you will have a case well able to put a 168gr pill to good use.

 

[bohemR13]

Recoil and flat trajectory at shorter distances is another consideration for things like PRS-style matches. Improvised shooting positions, fast strings (5-12 shots in 90 seconds) and nobody spotting for you pushes a lot of guys into the 6mm wildcats for a blistering MV*BC combination but virtually no recoil and super flat trajectory for little inconsistencies that come up from having to find the targets, range/lase them under time, and write up a data card all at once.

The 7 Creed, 7-08, 6.5 Creed and 260 are all basically the same trajectory. The differences are minor. When dropping down to 24 caliber bullets and using the 105 class bullets at 3100-3200+fps the benefits pick up and it makes sense for those style matches. Recoil and flat trajectory is a pretty big benefit even if the wind advantages are small.

 

[jsthntn247]

The 7-08 shines in hunting scenarios over the other 2 because of retained energy of using 160+ grain bullets. This energy on target is not needed in PRS and also starts out as recoil which is not desirable either.

 

[280nosler]

The 6.5's are the goldilocks area. 6.5 bullets are very mature in terms of ballistic age, and are used around the world. For a case size of the creedmoor or the venerable 308, they offer the best compromise.

The 7-08 is my go to hunting round. Great ballistics, good with short barrel, good barrel life, mid pressure, but has a pronounced level of recoil with 160 class grain bullets from a 7.5# gun.

On the other hand, a 243 is a flat trajectory, but does not do as well on deer sized game. It has a much worse barrel life, little recoil (very dependent on bullet and gun weight).

The 260 (used because it is based on the 308 cartridge) marries the qualities of both cartridges above. It is good for both hunting and target shooting, good quality and availability of bullets (never heard that said about the .25 caliber bullets), a medium amount of recoil and barrel life when comparing it big brother and little sister.

As such, many people have migrated toward the 6.5's because of their bullet selection, willingness to reload, newer factory loadings, and for some brass life.

 

[JRS]

The 6.5's are the goldilocks area. 6.5 bullets are very mature in terms of ballistic age, and are used around the world. For a case size of the creedmoor or the venerable 308, they offer the best compromise.

The 7-08 is my go to hunting round. Great ballistics, good with short barrel, good barrel life, mid pressure, but has a pronounced level of recoil with 160 class grain bullets from a 7.5# gun.

On the other hand, a 243 is a flat trajectory, but does not do as well on deer sized game. It has a much worse barrel life, little recoil (very dependent on bullet and gun weight).

The 260 (used because it is based on the 308 cartridge) marries the qualities of both cartridges above. It is good for both hunting and target shooting, good quality and availability of bullets (never heard that said about the .25 caliber bullets), a medium amount of recoil and barrel life when comparing it big brother and little sister.

As such, many people have migrated toward the 6.5's because of their bullet selection, willingness to reload, newer factory loadings, and for some brass life.

You have much to learn about the quarter bore