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Old August 10th, 2018, 04:21 PM #1
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OCW Conframation

I'm still learning how to read OCW results. For extra practice (and snickers) i tried a 55gr bullet as well as a 75gr.

I screwed up the charge marks on the paper with a pen but i was meticulous about the charge while loading. I relabeled them with good ol PAINT.

55gr


and 75gr
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Old August 10th, 2018, 04:29 PM #2
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Looking at the 75gr (ignoring the pen marks and looking at the typed charge values...) it appears that 20.5 is my best OCW and scatter is 22.5.

The 55gr, i'm going to say is.. looking like 22.5gr though i can't identify/verify it against an obvious scatter node.

Any ideas/feedback from fellow OCW reloaders?
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Old August 10th, 2018, 04:45 PM #3
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I've always been amazed at what a difference a grain or two can make regarding accuracy.

A one grain increase in my .243 Winchester reloads doubles the size of the group.


Looking at your group, I'd retest for 20.5 grains and 22 grains. Then settle on the better of the two. Maybe increase your testing to seven or eight rounds each. To account for flyers.

Keep your barrel as cool as possible to best replicate a cold barrel shot.


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Old August 10th, 2018, 05:31 PM #4
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the load testing for my 300 win mag was "easy" to spot. I also did 0.3 gr instead of 0.5gr I also took A LOT more time doing the testing. I did today's test in one hour, the 300 win mag took me 5 hours to complete. for the same number of rounds.

Thanks for the feedback. I assume you're only looking at group sizes not OCW groups because it seems you picked the tightest groups instead of the most consistent pattern of grouping even if they aren't as tight.
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Old August 10th, 2018, 05:42 PM #5
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unless perhaps you meant make the entire range from 20.5 to 22.5 testing in 0.2gr increments.. hrm... might try that. take several minutes between shots (dont have a barrel temp reader thingy).

should have thought about that. 0.5gr is a HUGE difference in a small volume case such as 223. Less of a deal breaker in the 300 win mag where volume is almost tripple that of a 223.

./sigh

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Old August 10th, 2018, 06:08 PM #6
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I wouldn't concern myself with .2 grain increments.

You have two great groups based on two great loads as it is.

I would retest for those two loadings only.
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Old August 10th, 2018, 06:15 PM #7
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Did you shoot these "round robin" or shoot all of each charge weight into the same spot before moving on to the next charge weight? I've heard arguments in favor/against each method but have always stuck to the later method with my testing.

The other method I've found interesting (but have not tried) is the one where you load 10 rounds in increasing charge increments (e.g., 22.0 to 25.5) and look for a velocity flat spot that theoretically should be centered around a node.
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Old August 10th, 2018, 06:30 PM #8
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Please excuse my ignorance, but what is this OCW and Node you guys are referencing?

I was focusing solely on group size and charge weight.

Looks like a chance to learn something new here.


PS: Never mind. Looked it up on-line.
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Old August 10th, 2018, 06:34 PM #9
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I think you might want to increase powder charge for the 75gr. 24gr of varget and 75gr hornady seems to be the trick. Obvouisly work yoir way up in 1% increments
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Old August 10th, 2018, 07:24 PM #10
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Quote:
Originally Posted by iH8DemLibz View Post
Please excuse my ignorance, but what is this OCW and Node you guys are referencing?

I was focusing solely on group size and charge weight.

Looks like a chance to learn something new here.

Google OCW 223 or OCW 308 etc etc. theres a great article/site about it. The short version is, it allows a bigger "window" to account for variables beyond control (weather, elevation.. etc etc).

Example is my 300 win mag load. I use 64 gr and still get sub moa BUT.. i can put 63.5 up to 64.5 and still get the same "general group" location AND maintain 1 moa. So i reload for the middle of that group thus allowing me a greater window. It's not a big deal at 100-200 yards, but start pushing it out to 600-800 yards and you'll see it quickly.

Once you get the OCW, you can fix the group size by seating depth and other things.. as long as your not WAY off.
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