Okay, back from the range. Preliminary tests are done. May I first start off by saying that it was a tough morning to shoot. The storms finally cleared here in S. Utah late yesterday. Resulting in intense fog this morning. The temps were cold and humidity was high. So groups are not anywhere near as tight as I would have hoped. However, I believe this to be more based upon shooter performance rather than bullet performance. Yep thats right. I was freezing my keester off! Here are the loads I shot, chronograph and the observed results.
All loads were fired with H4350 Powder and CCI 200 Primers with Winchester brass. Test rifle is a Parker Hale 1200 Super, 24" factory original Barrel, 6mm Remington. COAL is 2.903"
Load # 1, 43grains
3067 fps
3062 fps
3049 fps
3080 fps
Average Velocity 3064
ES 31 fps
This load grouped .959"
Load # 2, 44grains
3144 fps
3115 fps
3111 fps
3140 fps
Average Velocity 3127
ES 33 fps
This load grouped .888"
Load # 3, 45grains
3186 fps
3188 fps
3183 fps
3206 fps
Average Velocity 3190
ES 23 fps
This load grouped .741"
Load # 4, 45.5grains
3239 fps
3235 fps
3217 fps
3230 fps
Average Velocity 3230
ES 22 fps
This load grouped 1.399" This Group opened way up. I believe this was due to the cold
and not the particular load. At this point I was very uncomfortable shooting and it shows.
It's unfortunate too because this load was the most consistent as far as velocities and ES.
Load # 5, 46grains
3272 fps
3249 fps
3261 fps
3267 fps
Average Velocity 3262
ES 23 fps
This load grouped .484"
It appears that the 46 grains will be Max load for this rifle. It is one grain over that furnished by quick load. I will most likely use it for the rest of my development and testing.
From here I will also be trying some CCI BR2 primers and some different seating depths to see if I can shrink the group down from .484". I may also consider trying some IMR 4831.
Once I have developed the best group that I can, I will do the terminal performance tests that I mentioned earlier.