quote:

Originally posted by ALF:
I have rifles in both calibers and must say unless one has access to very expensive and relatively rare German brass or ammo the 6.5 x 57 is dead in the water for the majority of North American shooters. The 6.5x55 not so much. Even 7x57 brass has become scarce!

quote:

Originally posted by bartsche:
There really isn't a whole lot of difference in performance between the two. If you reload,however , the 6.5X55 cases are more readily available.
There's hitch in that rig in that American made 6.5X55 cases are under size.
The euro cases are to spec.
Why ? ;you say. I don't have the foggiest. roger

quote:

Originally posted by Beretta682E:
6.5 creedmoor

Mike

quote:

Originally posted by Mike_TX:

quote:

Originally posted by Beretta682E:
6.5 creedmoor

Mike

I have a beautiful little 6.5 Creedmoor that Duane Wiebe built on a Kurz action...... just trying to decide what to do with the Brno 21 in 6.5x57. I guess I’ll just leave it alone for the time being.

quote:

Originally posted by wildcat junkie:
Once a 6.5 mm projectile leaves a barrel at a given Mv and rate of spin, what was behind it in the chamber is irrelevant.

quote:

also variations seen in wounding effects with close up shots fired from the same weapon using same lot of ammunition.

Mike

Never under estimate the internet community to use any opportunity to reply to a post with their personal rant about their tangentially related, single occurrence problem.



What I have learned on AR, since 2001:
1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken.
2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps.
3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges.
4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down.
5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine.
6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle.
7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions.
8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA.
9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not.
10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact.
11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores.
12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence.
13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances.

quote:

Originally posted by ALF:
Originally posted by wildcat junkie:

Once a 6.5 mm projectile leaves a barrel at a given Mv and rate of spin, what was behind it in the chamber is irrelevant.


Nope not so !

There is more to precision than simply velocity and rate of spin !

There is the pesky little overlooked problem of projectile attitude at time of barrel egress and of course projectile disturbance by the ejecting gas mass !

Ballistics 101 !
Projectile egress is stochastic albeit within upper and lower limits within a window of variance.

In precision shooting the object of the exercise is to keep the magnitude of disturbance to a minimum and then also to limit the magnitude of the attitude variance.

Precision shooters go to great lengths to regulate neck tension and intra bore instability and attitude because of the above.

Not only does this have an effect on precision shooting but also variations seen in wounding effects with close up shots fired from the same weapon using same lot of ammunition.

quote:

Originally posted by bartsche:

quote:

Originally posted by ALF:
Originally posted by wildcat junkie:

Once a 6.5 mm projectile leaves a barrel at a given Mv and rate of spin, what was behind it in the chamber is irrelevant.


Nope not so !

There is more to precision than simply velocity and rate of spin !

There is the pesky little overlooked problem of projectile attitude at time of barrel egress and of course projectile disturbance by the ejecting gas mass !

Ballistics 101 !
Projectile egress is stochastic albeit within upper and lower limits within a window of variance.

In precision shooting the object of the exercise is to keep the magnitude of disturbance to a minimum and then also to limit the magnitude of the attitude variance.

Precision shooters go to great lengths to regulate neck tension and intra bore instability and attitude because of the above.

Not only does this have an effect on precision shooting but also variations seen in wounding effects with close up shots fired from the same weapon using same lot of ammunition.

If we're talking precision shooting here you might have a point. If we're talking something else your post is genuine over kill. TMI. roger