OCW Help

[DCR]

Working up a new load for my .308 after putting a brake on. I think I'm seeing my OCW charge in the 45.2 area. Can someone confirm that? Pretty new to these. Honestly looks pretty random to me. Shooter behind the stick probably needs more work.

I'll be heading back to the range for another test this weekend. 5 shot groups in .1 grain increments from 44.8 to 45.3.

The group at 44.6 grains is 3 shots. The tear in the upper right looks there is a shot there but there is not. Ignore my scribble. I was trying to find the center of the groups before I found the On Target software.

178 AMAX
Varget
Winchester brass
Winchester Primers

 

[Trental]

Re: OCW Help

If you can you may want to include the 44.6 in your work up. Groups 3, 4 and 5 all have similar POIs. Break it down from 44.6 to 45.2 and that will give you 6 more groups. Just my thoughts though. These things can be real tough to interpret sometimes. Also, if you ran the exact same test... will it come out the same?

 

[Hedge]

Re: OCW Help

45.2 looks like the load to me.

 

[DCR]

Re: OCW Help

Thanks.

 

[Huckleberry75]

Re: OCW Help

I agree with Trental. The 45.2 looks promising, as you are looking for a band of groups with the same orientation (which it is in the middle of). I would try fine tuning around the 45.2, and then work on seating depth.

 

[DCR]

Re: OCW Help

I got a much better story today. I tested from 44.6 to 45.2 in .1 grain increments. 45.2 looked good on the first test. But 44.9, 45.0 and 45.1 are all right there together. I'm going to settle for 45.0.

I took the chrono with me today too. And I really need to get another camera. This camera phone sucks.

Charge - 3 Shot Averaged - ES
44.6 - 2551 - 27
44.7 - 2545 - 23
44.8 - 2546 - 19 (3rd shot error on the chrono)
44.9 - 2556 - 52
45.0 - 2560 - 20
45.1 - 2582 - 44
45.2 - 2585 - 18

Light wind from 12
Overcast
44 Degrees
Baro 29.41 dropping to 29.38 by the end (from my Suunto watch)

 

[Hedge]

Re: OCW Help

Looks even better. Now verify with 5 - 10 shot groups and note your standard deviation.