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Finding the node #7106931 03/10/18 03:06 PM
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TackDriver Offline OP
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Headed off to the range with the .308 and forgot the damn chronograph, so did a 3 round group test with the MR-2000 and 185 Juggernauts in the .308 I never used MR-2000 and wanted to give it a try. Charges are in .3 increments as in order from left to right, 45.1, 45.4, 45.7, 46.0, 46.3, 46.6, 43.9, and 47.2 grains. Little wind from left to right at 5 to 8 mph and test is @ 100 yards. Should have done 200 but wind was acting a little weird. Velocity is unknown, but sure gives a sharper recoil than the 168 / 175's.
Opinions on a node? I was choosing # 3, 4 and 5 and try again @ 200 or 300. What say you?


Re: Finding the node [Re: TackDriver] #7106938 03/10/18 03:13 PM
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I like 5, but I think you should shoot all three charges again.


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Re: Finding the node [Re: TackDriver] #7106947 03/10/18 03:23 PM
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3 and 4 are a bit worrisome because it’s a lot of vertical dispersion

Re: Finding the node [Re: TackDriver] #7106968 03/10/18 03:38 PM
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Its ok, I always forget something when I go to the range. Always carry 2 new 9volt for my chrono.


SPACE FOR RENT


Re: Finding the node [Re: Cleric] #7106976 03/10/18 03:46 PM
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Originally Posted By: Cleric
3 and 4 are a bit worrisome because it’s a lot of vertical dispersion


I agree, won't hurt to try those 3 @ 300, but leaning on #5 but if it warms up in the summer, i may be out of the node. frown

Re: Finding the node [Re: RiverRider] #7106985 03/10/18 03:49 PM
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I'll rifle them again. I agree with you RR.

Last edited by TackDriver; 03/10/18 04:46 PM.
Re: Finding the node [Re: TackDriver] #7107012 03/10/18 04:23 PM
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Nice shooting TD. What's interesting to me is I would think more powder would equal more velocity, which would equal groups having higher POI instead of lower.

Re: Finding the node [Re: Jgraider] #7107024 03/10/18 04:37 PM
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Originally Posted By: Jgraider
Nice shooting TD. What's interesting to me is I would think more powder would equal more velocity, which would equal groups having higher POI instead of lower.


I saw that as well and was curious.

Any chance you pulled on 6? I’m more curious about 6 than 3-4.

Re: Finding the node [Re: Jgraider] #7107029 03/10/18 04:41 PM
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Originally Posted By: Jgraider
Nice shooting TD. What's interesting to me is I would think more powder would equal more velocity, which would equal groups having higher POI instead of lower.


That was weird to me as well, no idea why it went lower.

Re: Finding the node [Re: TackDriver] #7107033 03/10/18 04:44 PM
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Have you considered smaller increments in charge now that you have it narrowed down? Something like 46.0, 46.1, 46.2 and 46.3?


Originally Posted by onlysmith&wesson
I was wrong...on anything technical.

Originally Posted by Sailor
Fitz............. is right, ya know............
Re: Finding the node [Re: wp75169] #7107035 03/10/18 04:45 PM
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Originally Posted By: wp75169
Originally Posted By: Jgraider
Nice shooting TD. What's interesting to me is I would think more powder would equal more velocity, which would equal groups having higher POI instead of lower.


I saw that as well and was curious.

Any chance you pulled on 6? I’m more curious about 6 than 3-4.


Not so sure, I was careful with each shot, but won't hurt to try again with 3 to 6.

BigFitz, I will on the next time out to .2

Last edited by TackDriver; 03/10/18 04:47 PM.
Re: Finding the node [Re: TackDriver] #7107049 03/10/18 05:03 PM
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Originally Posted By: TackDriver
Originally Posted By: wp75169
Originally Posted By: Jgraider
Nice shooting TD. What's interesting to me is I would think more powder would equal more velocity, which would equal groups having higher POI instead of lower.


I saw that as well and was curious.

Any chance you pulled on 6? I’m more curious about 6 than 3-4.


Not so sure, I was careful with each shot, but won't hurt to try again with 3 to 6.

BigFitz, I will on the next time out to .2


Would try 3-6 with the .2 increments at 200 or 300 if available


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Re: Finding the node [Re: TackDriver] #7107069 03/10/18 05:38 PM
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Run the test at least at 200 or 300 yards and the answer will become more obvious.

Re: Finding the node [Re: TackDriver] #7107765 03/11/18 01:52 PM
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Nice shooting TD. Poi is trending downward but flattens out at five and still has very little dispersion through six. The center of those two groups appear to be the same point. I would probably start .1gr below group five and go to .1gr above group six. Looks like its shootin' pretty good right in there.


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Re: Finding the node [Re: TackDriver] #7111715 03/15/18 06:12 AM
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You all have a laboratory precision scale; +\- 1mg ?

I have never found a scale that was any better than +\- 0.2 grains.

Gage R&R.


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Re: Finding the node [Re: TackDriver] #7114899 03/18/18 04:24 AM
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Group 4 looks like 3 in the same hole and one "flyer" if you want to call it that. Group 5 and 6 both look good. I'd group shoot those loads at 300 and see which one looks best. If they all still look good and ES/SD seem fine, I'd pick the middle one so hotter temps didn't hurt me.

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