257 Roberts Ackley Improved

[JeffreyDeGraff]

Finally made it to the range. Had some interesting results. None of the loads showed any pressure signs, primers were fine, easy extraction. Results were as follows. RL19- 47.5gr 2920fps. 48.0gr 2983fps. 48.5gr 2997fps. 49.0gr 3024fps. 49.5gr 3067fps. H4831- 46.0gr 2866fps. 46.5gr 2901fps. 47.0gr 2926fps. 47.5gr 2933fps. 48.0gr 2983fps. IMR4350- 42.5gr 2825. 43.0gr 2844fps. 43.5gr 2883fps. 44.0gr 2922fps. 44.5gr 2933fps. What I found interesting was that 48gr of RL19 and 48gr of H4831 had the same exact velocity (granted it was one shot with each). The thing that I found the most interesting was that 12 of the 15 shots went into a 1.050” group, that’s 12 shots no two rounds the same, all different charge weights and powders. I feel like load development for this one is going to be a breeze.


JTD

[Wes Sage]

That is awesome!!! I had the same thing with mine!!
I was able to get a 75gr bullet to 4000+ Fps, and no matter what they were all in 1" at 100

Finally made it to the range. Had some interesting results. None of the loads showed any pressure signs, primers were fine, easy extraction. Results were as follows. RL19- 47.5gr 2920fps. 48.0gr 2983fps. 48.5gr 2997fps. 49.0gr 3024fps. 49.5gr 3067fps. H4831- 46.0gr 2866fps. 46.5gr 2901fps. 47.0gr 2926fps. 47.5gr 2933fps. 48.0gr 2983fps. IMR4350- 42.5gr 2825. 43.0gr 2844fps. 43.5gr 2883fps. 44.0gr 2922fps. 44.5gr 2933fps. What I found interesting was that 48gr of RL19 and 48gr of H4831 had the same exact velocity (granted it was one shot with each). The thing that I found the most interesting was that 12 of the 15 shots went into a 1.050” group, that’s 12 shots no two rounds the same, all different charge weights and powders. I feel like load development for this one is going to be a breeze.


JTD

[JeffreyDeGraff]

That is awesome!!! I had the same thing with mine!!
I was able to get a 75gr bullet to 4000+ Fps, and no matter what they were all in 1" at 100

Thanks Wes. There must be some magic involved!


JTD

[Wes Sage]

No magic, just found a load that could do it.
I stick to 3850 fps in it, just for safety reasons

Thanks Wes. There must be some magic involved!


JTD