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Old August 10th, 2018, 07:26 PM #11
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Originally Posted by Screwtop.243 View Post
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.
GREAT question. To each their own but, i shot each group before moving on to the next. The reason is, if the temp increases as you shoot. the middle group is always "warm but not hot".

When i did my 300 win mag (Savage 110BA Stealth).. i shot all 5, one after another (bolt action) took about 1 minute per shot. Then waited the rest of the cease fire (about 20-25 minutes) before doing the next group. EVERY group had the same rate of fire and benefit of the same barrel temp start to finish.
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Old August 10th, 2018, 07:47 PM #12
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Originally Posted by Speed3 View Post
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
In effort to keep in compliance with maryland gun powder limits, i'm trying to minimize the types of powder i have. Varget isn't in any of my other loads. I had 200 of these 75gr projectiles.. figured i would try w/ the powder i have on hand that's also listed in at least one manual.

That being said, i've heard some people use varget and 4064 ALMOST interchangeably. Obviously, do your own research etc etc but so far, i'm happier with the 55gr as a ghog/fox/coyote load under 400yards. The theory of the 75gr was to push it out a bit more to 600y or so. To be honest, i've mostly just switched over to the win mag anyway though hHAHAHA.

220gr ELDX out of a 300 win mag is.. devastating on a groundhog, even at 540 yards.
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Old August 11th, 2018, 04:44 PM #13
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Originally Posted by Moorvogi View Post
GREAT question. To each their own but, i shot each group before moving on to the next. The reason is, if the temp increases as you shoot. the middle group is always "warm but not hot".

When i did my 300 win mag (Savage 110BA Stealth).. i shot all 5, one after another (bolt action) took about 1 minute per shot. Then waited the rest of the cease fire (about 20-25 minutes) before doing the next group. EVERY group had the same rate of fire and benefit of the same barrel temp start to finish.
That seems like sound logic to me. That's pretty much what I do with all my rifles and lately have been testing with 6.5 X 47L and the 6.5-284 Norma. The only other thing I do (and I'll probably get flamed for this) is pull a bore snake through between 5 shot groups. Maybe I'm supposed to let the bores foul but with consistent .25 to .38 MOA and less than 1 minute vertical dispersion out to distance, I figure it's OK for crop damage duty out to 550 or 600 where I hunt.
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Old August 12th, 2018, 02:34 PM #14
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Old August 12th, 2018, 02:36 PM #15
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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?
Scatter should be 1.5% more or less than accuracy node.

So 1.5% higher than 20.5 = 20.8, 21.1 for next accuracy, then 21.4 for scatter.

Your steps are too large for OCW. OCW should increase 0.5 - 1% per step.

So starting at 20.0, you should use increments of 0.1 - 0.2 grains.
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Old August 12th, 2018, 02:37 PM #16
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Originally Posted by iH8DemLibz View Post
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.
Then you don't understand OCW method.
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Old August 12th, 2018, 02:38 PM #17
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Originally Posted by Moorvogi View Post
GREAT question. To each their own but, i shot each group before moving on to the next. The reason is, if the temp increases as you shoot. the middle group is always "warm but not hot".
You need to shoot OCW round robin.

This evens out affects of temp and of fouling.

And you should be running at least a full minute between shots to reduce heating.
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Old August 12th, 2018, 09:12 PM #18
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For readers who might want an easy link to click for more information, here ya go:

http://www.ocwreloading.com/home.html
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Old August 13th, 2018, 08:12 AM #19
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Quote:
Originally Posted by Pinecone View Post
Scatter should be 1.5% more or less than accuracy node.

So 1.5% higher than 20.5 = 20.8, 21.1 for next accuracy, then 21.4 for scatter.

Your steps are too large for OCW. OCW should increase 0.5 - 1% per step.

So starting at 20.0, you should use increments of 0.1 - 0.2 grains.
i was using a premade excel spreadsheet which only indicated to pick a value from 0.2 - 0.5 grains. It didn't give an explanation of where these come from. the 0.5 - 1% STEP makes more sense than grain amount.

My previous happy spot was at 22grains so maybe i'll go 2% under that and build up from there. To confirm the scatter.

Thanks again!
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Old August 13th, 2018, 08:20 AM #20
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Originally Posted by Pinecone View Post
You need to shoot OCW round robin.

This evens out affects of temp and of fouling.

And you should be running at least a full minute between shots to reduce heating.
Round robin would affect fouling, i totally agree. I can't see how it affects the heat though. I've never confirmed it with a heat sensor but.. my thought is this... every bullet shot heats the barrel. Let say it heats it by 1 degree every shot. This is fine, as long as it also COOLS.. the same amount every minute. If this doesn't happen, by the time you get to the last shot of the set, it's hotter than when you started.

I guess one solution is to get a heat gun/sensor and document the temp only shooting when it's the same temp each time?? Or recording two temps, one for a cold bore and one for warm bore. Which the round robin will be faulty then.

if shooting round robin is to normalize temperature, the only way it makes sense to me at the moment is to shoot EVERY shot at the same temp (cold bore).

again, i value feedback/ideas but i also feel that there should be supporting documentation or logic behind it.
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