AR Comp and Pro 2000 MR Range Report

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07-03-2011, 10:00 PM

AR Comp and Pro 2000 MR Range Report

Figured I'd show the baseline Varget workup next to it. There were a few flyers in there, but generallynoted and spotted. The graph lines are at exactly 1/2 inch, and all groups were measured with calipers tooutside edge with a .307 subtraction to obtain center to center group size. Chrono did mess up a fewtimes, but I verified its accuracy on some FGMM.

Rifle was a Savage 10 FCP-K with just a lightened triggger and Karsten cheekpiece, otherwise 24 inchbarrel, 1/10 twist, bone stock!

Here is Varget:

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Jimlaw83Sergeant

AR Comp and Pro 2000 MR Range Report http://forum.snipershide.com/snipers-hide-reloading/90260-ar-comp-pro...

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Stag Model 8, 6H upperSavage 10 FCP-K, 260 criterion and 308.

"Good decisions come from experience. Experience comes from bad decisions."

"Don't try to save the whole world. Instead, just try to leave it a little better than you found it." Me

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07-03-2011, 11:02 PM

Re: AR Comp and Pro 2000 MR Range Report

Not trying to be a jerk, but I'd really like to see your pics/docs without signing up for another account. Isthere a way where you would possibly just post the pics directly to your hide posting?

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esorensenSergeant


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07-03-2011, 11:27 PM


Absolutely. I see everyone else floating their images but I can't seem to get mine to post like that. Let mesee what I can do and I will repost

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07-04-2011, 12:39 AM


Here is AR Comp

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07-04-2011, 12:42 AM


And here is 2000MR

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07-04-2011, 12:15 PM


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m1k3Sergeant


9 of 14 3/24/2014 6:37 PM

Nicely done sir. Looking at your 2000MR groups, POI is about the same. The 45.7 load looks like thescatter group. If going by the OCW method, generally 1-2% above the scatter group is a node, usually agood OCW. 1% more of the 45.7 is 46.16gn. That's pretty dang close to your 46.2. I'd say you found it.And as you get hotter, the POI stays the same.

Great job and pics. Lots of data there.

mike

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07-04-2011, 04:12 PM


Indeed thanks! I'm thinking the AR comp can move hotter for sure, the velocity just wasn't matchingbook, while the 2000 definitely was exceeding. Got different glass coming in though, so I guess we willsee how much shooter error was there.

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08-21-2011, 11:20 PM


Which powder did you end up sticking with?

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08-23-2011, 07:03 PM


The 2000MR is my go-to load as of right now. I've got it fine tuned to (ended up coincidentally) 46.2grains seated .010 off lands. The savage is really liking it, and with the velocity sitting just under 2750,with an ES (now that I'm deburring and uniforming flash holes) under 20. Here is a pic of my final loadgroup in prep for the Rockcastle shoot next weekend. 5 rounds, I shot 4 foulers immediately before hand.She's holding .4 moa to 225 (as far as I can easily shoot around here) with VERY little vertical spread.And yes, the squares are 1/2 inch.

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08-24-2011, 01:00 AM #10

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11 of 14 3/24/2014 6:37 PM


I think you were onto another node with the 47.7 grain load. Maybe try a couple tenths lower? I haven'tdone a temp sensitivity test yet. So maybe this load would work well, just not in the middle of summer?



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08-24-2011, 08:00 PM


Now that I look at it, that may very well be the case. I may try a few loads up in the 47.4-6 range andsee what that brings. The 47.7 only gave me a sticky bolt on one or two of the rounds, so a bit below thatmay indeed show a bit of promise. I'll be chrono'ing my loads this winter as well for a comparison.

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08-25-2011, 09:08 PM


Got me some AR-Comp and 2000-MR to try this weekend [img]/smile.gif[/img]

Already got Varget and know what it can do in my rifle.

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08-26-2011, 07:45 AM


A minor tip with 2000mr. It's burn profile is a bit weird. I noticed mild ejector marks starting with mylowest loads, and I was freaked that I was already overpressured, but was not. Pay attention to bolthandle and primers, but a shellholder really helped me keep an accurate eye on pressure signs. Justbasically saying that those ejector marks seem to be inherent to the powder, and aren't indicative ofpressure. Use other methods.

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08-29-2011, 12:20 AM #14

AlliedArmory


12 of 14 3/24/2014 6:37 PM


Originally Posted By: Jimlaw83A minor tip with 2000mr. It's burn profile is a bit weird. I noticed mild ejector marks starting with mylowest loads, and I was freaked that I was already overpressured, but was not. Pay attention to bolthandle and primers, but a shellholder really helped me keep an accurate eye on pressure signs. Justbasically saying that those ejector marks seem to be inherent to the powder, and aren't indicative ofpressure. Use other methods.

I'm not rally sure what you mean by look out for ejector marks. Do you have a pic so I know what youmean and what to look for?

Thanks

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08-29-2011, 07:06 AM


I'm loading up my last 50 rounds tonight for the Rockcastle shoot, so I'll see if I can't find a case to take apicture of. Basically you'll see an round embossing on the case head around the rim of the primer thatwasn't there before. It is where the ejector would normally grab the base of the empty shell, but it willlook like someone took a round steel punch and lightly tapped it into the base of your shell.

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08-29-2011, 08:50 AM


here is a article on pressure and the third picture show three cases with various pressure signs which mayhelp explain better.

http://riflemansjournal.blogspot.com...ng-safety.html

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08-29-2011, 04:17 PM


Thanks for the link. I know what you mean now. No ejector marks so far [img]/smile.gif[/img]

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08-29-2011, 07:54 PM


I've got another thread on the 2000 MR and 190 SMK's. I shot what I perceived as a warmish load in100* F the other day. The brass and primers look as if I were shooting minimum loads. No primerflattening or cratering, no ejector marks, no difficult blot lift...nothing.

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AR Comp and Pro 2000 MR Range Report

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