March 29, 2008:
Range report - Parma, ID
Totally changed load for the 168SMK, starting over Reloader 15. Today was good and I think it will work well for me. I'm working up the Optimum Charge Weight. I started with 4 shots in each charge weight to narrow it down.
I was using my new/used chrono a Pact Model 1 with the M5 skyscreens. It's not the newest but I like the fact that the skyscreen are separate from the control unit. It was really handy to the the control unit on the bench. The screens are wide enough that I was able to shoot all 5 targets on the bench without moving the rifle or screens.
All shots at 200 meters.
2nd String - Don't know what happened here, but suffice to say this is one charge weight to stay away from, the other 2 were not even on the paper on the target next to it, 1" away????
3rd String - Without the flyer this was a decent group.
4th String - Now we are getting somwhere, 2 holes in one on the bottom and the overall group size was good too.
5th String - This may have been a good group as well, except for the flyer.
Overall I think I've found the charge weight band to work in with my rifle for this load. Somewhere between 42.0 and 42.8 I should find the magic zone. I was surprised at the velocity's, primer and brass didn't look bad, they are higher than indicated in the book. by almost 100fps. Hmm....
Once I find the charge weight I'll start playing with primers and seating depth. I have both CCI Lg Rifle and Bench Primers, currently the bullet is sitting .020" off the lands. I should be close there.
I am convinced the rifle will shoot better than me, the 2 flyers tell me that much, but overall, this are Sub MOA groups at 200 meters and should work well out to 800 yards or so.
|Shot||String 1||String 2|| String 3||String 4|| String 5|
| Average Deviation||7.0||7.9||14.2||15.0||12.0|
March 8, 2008:
Range report - Bend, OR
|Shot||String 1||String 2|
| Standard Deviation||17||24|
groups were at 100yards, but I forgot to go get the target when I was
done. DOH! Groups in the scope were around 1" on the square grid.
I now need to research what these numbers mean and how I can improve them. AND I need to start looking at the groups.
I was happy to see that my target velocity of 2600 fps was what I was getting with the 168gr SMK. I was using Federal once shot GM brass. Now that I am in the ballpark I will change over to the Lapua Brass and start working with some CCI benchrest primers.
After Chrono'ing the loads I input the current MET and vel data into my ballistic software. I am happy to report that the data cards that I generated at the range were dead on, at least out to 500 yards. I thought they were off at 500 yards by 2 MOA, but I noticed that I was working in meters instead of yards. Once I changed to yard, the tables were dead on.It was a great day at the range, and I now have some great data to work off of and develop this load.