5.56x45 OCW test... check me please?

WWWJD · May 24, 2013, 05:14 PM

I did an OCW test this morning and got the following results:

Would you guys agree that 24.1 to 24.5 seems to be the region of my accuracy node?

big al hunter · May 24, 2013, 05:38 PM

What am I missing on group 7 @ 25.6 gr. Is the group size of 0.298 a typo. Looks to me like further testing on that end may be warranted.

WWWJD · May 24, 2013, 05:47 PM

No typo Al, it was the smallest group of the bunch, but it's also a compressed load (the last two were); I'd rather not operate up there if I can keep from it. The bullets weren't crimped, and when I checked them this morning, they had walked out about .01". I may have pulled one on group 6 thus the 2moa group size. No pressure signs anywhere, but still... I don't know.

Jimro · May 24, 2013, 05:49 PM

Try looking between 24.0 and 24.5 gr.

4064 is a tad slow for a 60gr bullet, but in my experience you can load 24~24.5 gr of pretty much any powder (4064, Re15, 2000-MR) and get decent results with heavy match bullets. Makes sense that it would be fine for a 60gr bullet as well.

Jimro

big al hunter · May 24, 2013, 06:10 PM

The key for that load may be compressed powder. Or the .01 further forward may be what did it. The free bore is the next thing to play with after charge amounts. Do more testing with the higher charge and changing cartridge OAL.

WWWJD · May 24, 2013, 06:28 PM

I'll sweep through both regions again and see what happens. Can't hurt.

May 24, 2013, 05:14 PM	#1
WWWJD Senior Member Join Date: February 9, 2011 Location: Central KY Posts: 552	5.56x45 OCW test... check me please? I did an OCW test this morning and got the following results: Would you guys agree that 24.1 to 24.5 seems to be the region of my accuracy node? __________________ *~Mark* NRA Endowment FTW

May 24, 2013, 05:38 PM	#2
big al hunter Senior Member Join Date: March 12, 2011 Location: Washington state Posts: 1,558	What am I missing on group 7 @ 25.6 gr. Is the group size of 0.298 a typo. Looks to me like further testing on that end may be warranted. __________________ You can't fix stupid....however ignorance can be cured through education!

May 24, 2013, 05:47 PM	#3
WWWJD Senior Member Join Date: February 9, 2011 Location: Central KY Posts: 552	No typo Al, it was the smallest group of the bunch, but it's also a compressed load (the last two were); I'd rather not operate up there if I can keep from it. The bullets weren't crimped, and when I checked them this morning, they had walked out about .01". I may have pulled one on group 6 thus the 2moa group size. No pressure signs anywhere, but still... I don't know. __________________ *~Mark* NRA Endowment FTW

May 24, 2013, 05:49 PM	#4
Jimro Senior Member Join Date: October 18, 2006 Posts: 7,097	Try looking between 24.0 and 24.5 gr. 4064 is a tad slow for a 60gr bullet, but in my experience you can load 24~24.5 gr of pretty much any powder (4064, Re15, 2000-MR) and get decent results with heavy match bullets. Makes sense that it would be fine for a 60gr bullet as well. Jimro __________________ Machine guns are awesome until you have to carry one.

May 24, 2013, 06:10 PM	#5
big al hunter Senior Member Join Date: March 12, 2011 Location: Washington state Posts: 1,558	The key for that load may be compressed powder. Or the .01 further forward may be what did it. The free bore is the next thing to play with after charge amounts. Do more testing with the higher charge and changing cartridge OAL. __________________ You can't fix stupid....however ignorance can be cured through education!

May 24, 2013, 06:28 PM	#6
WWWJD Senior Member Join Date: February 9, 2011 Location: Central KY Posts: 552	5.56x45 OCW test... check me please? I'll sweep through both regions again and see what happens. Can't hurt.

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