I did a small test today. Granted, the sample size isn't large but there's enough there to draw some conclusions for more testing.
I loaded 60.3 grains of H1000 in my 6.5 SS using Norma brass. It's all from the same lot. Cases were measured with a Sinclair 40 degree bump insert. All loads were measured on an FX120 using grams (3.901) for more accuracy.
Fired cases measure 2.523-2.525
Four loaded cases measured 2.5195
Four loaded cases measured 2.516-2.517
I had one case at 2.521 so went ahead and loaded it
Results over the Magnetospeed at 30 degrees in the order fired. There was about 90 seconds between each 'group'. All loaded rounds easily chambered with no resistance.
2.5195" - 3193, 3198, 3202, 3213; SD 8.4
2.516/17" - 3198, 3199, 3198, 3210; SD 5.8
2.521" - 3174
The first thing I noticed was the fourth shot on the four shot strings were faster. I went back through my data book and found this to be a pattern. Longer shot strings over the Magnetospeed produce higher average velocities. I usually shoot a whole string straight through. I may stop doing that and give things time to cool to get a more accurate velocity.
The second group measures .0035" shorter at the shoulder than the longer ones. The velocities were more consistent even excluding the fourth shot of each string.
The last shot is noticeably slower than the others. None of the others were slower than 3193 and this one was 19 fps slower than the slowest shot in the other strings.
More testing is needed but, for velocity, it would seem my rifle likes .005 - .006" shoulder bump vs tighter.
H1000 seems to produce the lowest SD for all the tested charges when compared to N570, R26 and R23.
Incidentally, I loaded 60 grains of H1000 yesterday and shot it at 10 degrees after leaving the rifle and loaded rounds outside for an hour. The average for 5 shots was 3176 with an SD of 5.6. That same charge at 49 degrees gave me 3196 with an SD of 6.4. Note, these two strings were loaded at different times so it's not an apples to apples comparison. But, that's a loss of 20 fps from cold to frigid.
60.3 of H1000 at 51 degrees gave me 3213 with an SD of 3.4 and .331" group and another of .682 with an SD of 3.4. This is a gain of 11 fps going from 30 to 51 degrees.
I loaded 60.3 grains of H1000 in my 6.5 SS using Norma brass. It's all from the same lot. Cases were measured with a Sinclair 40 degree bump insert. All loads were measured on an FX120 using grams (3.901) for more accuracy.
Fired cases measure 2.523-2.525
Four loaded cases measured 2.5195
Four loaded cases measured 2.516-2.517
I had one case at 2.521 so went ahead and loaded it
Results over the Magnetospeed at 30 degrees in the order fired. There was about 90 seconds between each 'group'. All loaded rounds easily chambered with no resistance.
2.5195" - 3193, 3198, 3202, 3213; SD 8.4
2.516/17" - 3198, 3199, 3198, 3210; SD 5.8
2.521" - 3174
The first thing I noticed was the fourth shot on the four shot strings were faster. I went back through my data book and found this to be a pattern. Longer shot strings over the Magnetospeed produce higher average velocities. I usually shoot a whole string straight through. I may stop doing that and give things time to cool to get a more accurate velocity.
The second group measures .0035" shorter at the shoulder than the longer ones. The velocities were more consistent even excluding the fourth shot of each string.
The last shot is noticeably slower than the others. None of the others were slower than 3193 and this one was 19 fps slower than the slowest shot in the other strings.
More testing is needed but, for velocity, it would seem my rifle likes .005 - .006" shoulder bump vs tighter.
H1000 seems to produce the lowest SD for all the tested charges when compared to N570, R26 and R23.
Incidentally, I loaded 60 grains of H1000 yesterday and shot it at 10 degrees after leaving the rifle and loaded rounds outside for an hour. The average for 5 shots was 3176 with an SD of 5.6. That same charge at 49 degrees gave me 3196 with an SD of 6.4. Note, these two strings were loaded at different times so it's not an apples to apples comparison. But, that's a loss of 20 fps from cold to frigid.
60.3 of H1000 at 51 degrees gave me 3213 with an SD of 3.4 and .331" group and another of .682 with an SD of 3.4. This is a gain of 11 fps going from 30 to 51 degrees.
