Berger 156 in 6.5 PRC

I've worked with 4 different 6.5 PRC rifles using RL-26, all of the rifles had 24" Proof carbon barrels. Accuracy was awesome in all of them with RL-26 pushing the 156 Berger's right @ 3000 fps. These targets were some seating depth testing I did @ 500 yards with 57.5gr and 58gr. seated .020, .025, & .030 off the lands. For reference green target dots are 2" circles.
 

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The two you have will work for sure. N565 and N570 are two others to check out. R23 will work but might be a little too fast to give you the most velocity. It'll be accurate, though.
 
53.9 R26 at .090 off the lands Lapua brass 26'' benchmark and throated .025 longer. Bullets seated at the junction and very accurate,right at 3000 fps went as high as 55 grs before pressure and did the ladder test 10, 50, 90, and .120 thousands. It's great to see other powders working well.
 
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