From this article:
http://demigodllc.com/articles/6.5-shootout-260-6.5x47-6.5-creedmoor/?p=1"Bottom-line: Load, Ballistics, Accuracy
Final load: 123gr Lapua Scenar @ 2930 fps, 37.2gr RL15, CCI BR4, Lapua brass.
From a 100-yard zero, this load needs 7.2 mils of elevation to 1000 yards, and will drift 59 inches with a 10 mph cross. Accuracy is excellent at 1/4 MOA or better.
In the field, the performance of the .260 Remington is almost indistinguishable from the 6.5x47 Lapua.
123 6.5x47 Lapua @ 2930
Zero 100yd 5000' Density Altitude
RANGE ELEV- moa mil | WIND(10) moa mil RANGE
100 0" 0.00 0.0mil | 0" 0.50 0.1mil 100
200 2" 1.25 0.3mil | 2" 1.00 0.3mil 200
300 10" 3.25 0.9mil | 4" 1.50 0.4mil 300
400 23" 5.50 1.6mil | 8" 2.00 0.6mil 400
500 42" 8.00 2.3mil | 13" 2.50 0.7mil 500
600 68" 10.75 3.2mil | 19" 3.00 0.9mil 600
700 102" 14.00 4.0mil | 27" 3.75 1.1mil 700
800 145" 17.25 5.0mil | 36" 4.25 1.2mil 800
900 197" 21.00 6.1mil | 47" 5.00 1.4mil 900
1000 260" 24.75 7.2mil | 59" 5.75 1.6mil 1000
Load Development Notes
I found the 6.5x47 cartridge very tolerant to different load recipes-- getting great results was the norm during load development.
Using Lapua brass, bullets from Lapua and Berger, and a variety of powder and primers, I tested no less than 45 combinations looking for the "best" overall performer. Besides excellent accuracy and consistency, I also wanted optimum ballistic performance for long-range UKD courses of fire with 100% reliability-- there are no sighters or alibis in practical competition. It was almost immediately clear that the pressure limiter in 6.5x47 in the AI-AW rifle would be the primer piercing issue I originally saw with the .260. Ignoring the primer issue, even with nuclear loads substantially exceeding my final load, there were never any pressure signs on the case head, nor was the bolt hard to lift.
Quarter-MOA or better groups seemed to be the norm, not the exception, while doing load development with the 123 and 139-gr Lapua Scenar and Berger 130 gr.
Using powders such as RL15, H4350, Varget, and N550, accuracy was very consistent with the 123-grain and 139-grain Lapua Scenars, along with the 130-grain Berger VLD. Of the 45 combinations tried during the sandbagged 100-yard bench-rest testing, less than 10% were noted for "poor accuracy". To put things in perspective, "poor accuracy" meant worse than 0.5 moa. Most loads shot between 0.25 and 0.5 moa, and the best loads shot just better than 0.2 moa. I should add a disclaimer at this point that I am not a particular good bench-rest shooter. In the end, I settled on the 123-grain Lapua Scenar shot at 2930 fps using 37.4-grains RL15 with a CCI BR4 small rifle bench-rest primer, with a loaded over-all length of 2.735-inches.
Without the primer issue, the following ballistics would have been possible based on the experimental results: a 139-grain Lapua Scenar at 2850 fps; a 123-grain Lapua Scenar at 3080 fps; and a 130-grain Berger VLD at 2950 fps. RL15 is the powder for 6.5x47 Lapua. Similar results were had using H4350 and N550, but the RL15 seemed more predictable and was more consistent. With regard to primer selection, CCI 450, BR2, and #41 all gave similar results."
(RL15 and H4895 are close, with 4895 being listed as quicker. You could try 30gr to start and work up from there. Possibly, a all to Hodgdon would get you better info. Good luck.)
