6.5X47 and 260 Remington comparison

[SteveOak]

I've been looking at published load data for the 6.5X47 and 260 Rem like the Lapua site and the Nosler site. I looks as though higher velocities with the same weight bullet con be achieved and with a smaller powder charge. The velocity difference seems to be more than can be accounted for by 63,090 vs 60,190 pressure difference.

Is this the case? What are typical optimal velocities for a 140-142 gr class VLD type bullets for the 6.5X47 and 260 Rem?

If the 6.5X47 is capable of higher velocities with less powder, what accounts for the performance difference?

 

[ShootDots]

I've been looking at published load data for the 6.5X47 and 260 Rem like the Lapua site and the Nosler site. I looks as though higher velocities with the same weight bullet con be achieved and with a smaller powder charge. The velocity difference seems to be more than can be accounted for by 63,090 vs 60,190 pressure difference.

Is this the case? What are typical optimal velocities for a 140-142 gr class VLD type bullets for the 6.5X47 and 260 Rem?

If the 6.5X47 is capable of higher velocities with less powder, what accounts for the performance difference?

The reason for the nearly same velocities between the 2 is because the 6.5 x 47 uses SMALL PRIMER POCKETS. Those pockets make that brass nearly indestructible. Now there is a HUGE caveat though. You can, with a little work, make .308 Lapua Palma Brass into a .260Rem. Then you have SMALL PRIMER POCKETS too. Now you are comparing apples to apples. Additionally, if you wanted to, it is a simple matter to make a .260 into a .260A.I. Couple that "improvement" with the use of Palma brass and any similarities evaporate.

 

[SteveOak]

Thanks for the reply.

My understanding is that the small primer pockets (and better quality of brass) allow the cartridge to be run at higher pressure. The pressure difference is 4.8%. Is that enough to account for the velocity difference?

I just remembered that the 6.5X47 Lapua has a 30 degree shoulder too.

 

[ShootDots]

Thanks for the reply.

My understanding is that the small primer pockets (and better quality of brass) allow the cartridge to be run at higher pressure. The pressure difference is 4.8%. Is that enough to account for the velocity difference?

I just remembered that the 6.5X47 Lapua has a 30 degree shoulder too.

I do not know what amount of pressure would account for the additional velocity. All I do know is, is that you can run higher pressures with S/R Primer Pockets. There is enough difference that the greater powder capacity of the .260 is all but negated by the higher possible pressures attainable with the 6.5 x 47..