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-   -   6.4x47mm Lapua vs 308... (http://glocktalk.com/forums/showthread.php?t=1442849)

ArrowJ 09-13-2012 16:57

6.4x47mm Lapua vs 308...
 
Note: also posted on Ammosmith and Cast Boolits.

I was just watching the sniper rifle episode of ultimate weapons (2009), and they (Tactical Rifles' Rep) were comparing the 6.5x47mm to the 308. I thought it might be interesting to hear some discussion about this. To be clear, I am not LEO or military, and my only experience with a 308 is from a mil surp rifle several years ago. My interest is mostly academic with some chance of reloading in the far future. They were firing it from Tactical Rifles M40-T7.

Edit: could a mod correct my title please? 6.5 not 6.4 sorry.

noway 09-20-2012 23:10

6.5mm are always going to be far superior than a 308win in long distance shooting. VLD bullets and plenty of benchrest shooters have shown this to be the case time over time. And F-class shooters will tell you that 308win is taking a back seat to other calibers.

Now a 6.5 and lapua is going to be tight and expensive on brass, since your limited in brass and brass is quite expensive being that it's from Lapua. Same with the creedmoor only once source for brass and forming cases from another case is time consuming.

So We are not sure as to what your going with this thread, but if your handloading, the 6.5x47 or any 6mm variant would always outdo the 308win with better BC, less recoil, and less impact by winds. My 6.5x55swede is even very accurate with store bought ammo.

ArrowJ 09-21-2012 03:40

Just looking for general discussion of the ideas. I am not interested in forming brass or firing a cartridge with with a single brass supply.


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http://thesitterdowners.com

Chuck54 09-21-2012 11:28

Does a 260 Remington fit in here ?

dkf 09-21-2012 12:38

http://www.6mmbr.com/gunweek084.html

Tiro Fijo 09-21-2012 12:42

Quote:

Originally Posted by Chuck54 (Post 19442254)
Does a 260 Remington fit in here ?


No, it won't take bullets larger than 140 gr. in its action length.

noway 09-22-2012 00:27

Quote:

Originally Posted by Tiro Fijo (Post 19442465)
No, it won't take bullets larger than 140 gr. in its action length.

hmm not correct....at all.

You can handload 260remington with heavier bullets ( norma/smk,etc...), but than the cartridge was not designed for that and there's really no real reason from a long distance shooting for anything over 140gr in a 6.5mm imho.Or even from a hunting aspect. If you need a heavier bullet, than you need a bigger caliber imho. Nor do you need a heavier bullet to match the bc of a 308winny. The longer bullets of the 6.5mm vrs 30cal, will always exceed the 30cal offerings.

You still haven't explain why a 6.5x47lapua vrs 308win, you pick one of the hardest to find cartridge commericially, if not one of the expensive ( lapua ) with limited availability of loaded commercial ammo, and case components , vrs a very common 308win, with hundred of more options and availability in commercial offerings and reloading.

from a reality check, most serious shooters of 6.5mm are handloading these. And most 6.5x47 L A P U A shooters are handloading or reloading these. In more of a reality check, if you buy anything chamber in 6.5x47lapua and plan on really shooting it, you will most likely start handloads for it, unless you have deep pockets

also btw, the action length has nothing to do with the ability of the 260remington to hold a bullet greater than 140 to a certain degree. As a matter of fact a few loads exists commericially that are slightly heavier than the std 139/140grain offerings in a 260reimngton all are 142 or 156 grain btw.

Good luck finding them


btw remington did very badly with promoting the 260remington and a very few mfg'er today even having anything chambered for it.


:cool:

Tiro Fijo 09-22-2012 03:36

Quote:

Originally Posted by noway (Post 19444234)
hmm not correct....at all.

You can handload 260remington with heavier bullets ( norma/smk,etc...), but than the cartridge was not designed for that and there's really no real reason froma long distance shooting for anything over 140gr in a 6.5mm imho...


You seem to disagree and then agree with my point of view. :dunno:

When one loads a heavier bullet, such as the 160 gr., powder capacity is diminished as well as defeating a great benefit of the .260 Rem.: the ability to be used in a shorter action. Yes, sometimes one can handload a heavier than recommended bullet for a particular cartridge, however these usually must be loaded singly and directly into the chamber and not from the magazine if a repeater. For a pure benchrest gun this is no problem, but for anyone wanting a magazine repeater then no.

SCmasterblaster 09-27-2012 19:47

The 6.4x47mm bullets must have better ballistic coefficients than the 150-gr .308 bullets.

noway 10-01-2012 03:28

most of them, a 120gr 6.5mm would have a bc and sectional densitt that compares to about a 168gr 30cal. A 140grain would be more like a 180grain, and a 160gr 6.5mm bullet, would be comparative to that of a 200 grain 30cal bullet.

to calculate a SD, take bullet weight in lbs divided by dia squared.

Quote:

You seem to disagree and then agree with my point of view.
nope


You made a statement that was incorrect ( action ) and I corrected it for you. :wavey:

Now the benefits of if a 260remington or a 6.5x47 lapua and a 160grain bullet, is another thread or posting.

:wavey:

SCmasterblaster 10-01-2012 09:53

Thanks for the SD calc. I always wondered how it is derived.


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