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[Hunter26]

@Blkram have you tried the numbers with N565? It is an excellent 6.5 PRC powder.

 

[Blkram]

@Blkram have you tried the numbers with N565? It is an excellent 6.5 PRC powder.

With VN565, the 6.5 PRC will be as follows:

• 140 gr AB: max charge of 60.0 gr for 3058 fps
• 142 gr LRAB: max charge of 59.3 gr for 3036 fps

So not the same velocity potential as 560, 568, or 570. But until tried, won't know what the accuracy potential will be. And I will have to acquire some to try...

 

[Backcast88]

Ran the QL numbers for the 280 Rem tonight...and 270 WSM.
In the 280 Rem, with pressure up to 65K psi, max should be 61.6 gr of N560 for 3109 fps with the 150 gr BT or AB. (This is 45 fps faster than the max with Re-17, but uses 6.7 gr more powder to achieve this. Compared to other VV powders, this will potentially produce the best velocity.)
That is pushing it into 7mm Rem Mag territory!
Will have to see how it shoots in my Rem 700...

In the 270 WSM with the 140 gr AB, 68.0 gr of N560 will achieve 3216 fps in the 23" barrel of the Browning X Bolt All Weather at just under 65K psi. This is just 19 fps faster than the max load with Magnum powder, but uses 6.2 gr less powder.
N568 will produce a little more velocity (3249 fps) with a 75.5 gr charge. (I would need to acquire this powder to try.)
N570 will produce 3285 fps with a 76.6 gr charge. (I have this powder on hand.) This will potentially produce more than 200 fps gain over the factory ammo (which produces 3073 fps and 0.565" groups in my rifle), and drop 5.2" less at 500 yards with a 200 yard zero, while retaining 182 fps more velocity and 255 ft lbs of energy at that range.
Will have to see how these powders perform safely up to max in my rifle...and which will produce the best accuracy.

My buddy played with n568 in 6.5prc. Found it to be kind of a dud. He got way better results with n560 and n565. He ran out of case capacity to get the expected performance. Maybe it'll work better in 270 wsm, but I would go n565 or n560 well before n568.

 

[IdahoCTD]

I looked back at some N565 loads with 147 Hornady eld-m's in a 6.5PRC. 55.5grs with Peterson brass averaged 2903fps with a ES of 3.9fps and a standard deviation of 1.7.