02-22-2016, 03:36 PM
Out of those powders, I would try RL15 and Varget, but I would prefer something else. Benchmark, R10x, and 8208 XBR are fast for the 129gr ABLR.
For Varget, you could start with 25.7gr and work up in .3gr increments. I would stop at 27.0gr if you get there.
For RL15. It's right next to AA2520 and N140 on the burn rate chart, and is extruded with kernel sizes larger than 8208 XBR.
Nosler and Hornady both have data for RL15, but Nosler's is under either a 123gr NCC or 125gr Partition, not the 129gr ABLR.
Hornady has data for the 129gr SST/IB/SP, but the jackets are different than the ABLR, as is the bearing surface and bullet length.
In the 9th Edition from Hornady, they show RL15 under 129gr Hornady pills with a start load of 23.8gr and max of 27.6gr.
They also show the same data for Varget to within .1gr, with the same start load and 27.5gr as max under the Hornady 129gr bullets.
Don't extrapolate that to mean that the data is interchangeable with the 129gr ABLR though, as my experience with the ABLR suggests that it builds pressure faster than the 129gr SST.
Work up in .3gr increments and use a chronograph. I'm sure others would be interested to see your results with the 129gr ABLR on RL15 and Varget.
For Varget, you could start with 25.7gr and work up in .3gr increments. I would stop at 27.0gr if you get there.
For RL15. It's right next to AA2520 and N140 on the burn rate chart, and is extruded with kernel sizes larger than 8208 XBR.
Nosler and Hornady both have data for RL15, but Nosler's is under either a 123gr NCC or 125gr Partition, not the 129gr ABLR.
Hornady has data for the 129gr SST/IB/SP, but the jackets are different than the ABLR, as is the bearing surface and bullet length.
In the 9th Edition from Hornady, they show RL15 under 129gr Hornady pills with a start load of 23.8gr and max of 27.6gr.
They also show the same data for Varget to within .1gr, with the same start load and 27.5gr as max under the Hornady 129gr bullets.
Don't extrapolate that to mean that the data is interchangeable with the 129gr ABLR though, as my experience with the ABLR suggests that it builds pressure faster than the 129gr SST.
Work up in .3gr increments and use a chronograph. I'm sure others would be interested to see your results with the 129gr ABLR on RL15 and Varget.
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com