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Old 01-11-2011, 10:41 PM
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6.5x55 vs .260 REM vs 6.5 Creedmoor

6.5x55 factory ammunition is loaded to 46,000 psi.
Because of the many older firearms that chamber the 6.5x55 that are still in-service.
The Swede can be safely hand loaded to higher operating pressure for use in modern rifles.

Sensible Rifle Cartridges
The SAAMI mean maximum pressure limit for the 6.5x55 is 46,000 cup.
While, the .260 REM is loaded to .308 WIN pressures - at least 58,000.
As such, hand-loading data has to take this fact into consideration.

A Pedigreed 6.5
The pressure spec for the 6.5 Creedmoor is the same as the .308 Winchester, 62,000 psi,
although Hornady's factory loads are well below that at 57,000 psi.
The 6.5x55 was designed to load long bullets - exceedingly long for the time of its inception.
While the .260 REM because of COL concerns has some bullet length limitations.
Also, loading long bullets in the .260 REM will require set-backing them back
_into the case resulting in a compressed charge.
Or, reducing maximum powder capacity.

The bullet length limitation of the .260 REM is resolved by the 6.5 Creedmoor.
Even with the very long VLD bullets, the case capacity of the 6.5 Creedmoor
is much less compromised in comparison than with the .260 REM.

6.5mm Cartridges — Comparative Ballistics Performance
The .260 Remington’s main problem for the reloader is lack of high-quality
_and affordable brass and to date there has only been one factory load produced
_which was appropriate for serious long-range competition for the non-reloader.

Put simply, the 6.5 Creedmoor is what the .260 Remington should have been.
It looks like Hornady has the right mind-set to make its new cartridge a success
_in the competitive and practical market,
unlike Remington who basically let the .260 languish in a few hunting rifles.
6.5 Creedmoor - .260 Done Right?
6.5X55 vs the 260 Rem
The Case for .260 Remington: A Better Cartridge For Practical Long-Range Shooting

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