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AR COMP update. Get'in Scary!

Here are the results of my load work up of AR Comp and 168 NBT's at 718yards. The conditions were perfect, and this is my smallest long range group to date. Some of you bench guys might want to look into it. ;) Just shot this today!

1101111310-00.jpg


Tank
 
That thing is huge, like is it MOA around a mile or so lol? :P How big is it? Do you set it at one range and move back as needed?

I've always cut mine 3/4-1 MOA for specific ranges

What's the chrono and load data for this?
 
That is a 1.5" group at 718yds. It's a .308 Win, RWS Brass, F210M, 42.8grn AR Comp, 2790fps Avg, 4.5fps ES, 2.8fps SD. The pic is up close with a cell phone. The plate we are shooting is 12"wX24"L. We set it up in a field across a road. The road sets about 60' from our position to the target. It just so happens where we set up is almost perfectly level to the target. My first 3 shot group with this load at 100yds produced a .116" group.

Tank
 
JS

Its right there with R15 and Varget, 4064, 2520, N140. I have some but have not found time to test it yet.

Tank
Thanks for the report. What is the barrel length on your shootin iron? Im looking to try it in a 6BR 30" barrel and a 30 Palma 308. Glad you got such good results, the only bad part is thats there is nothing left to blame its all on you now if you miss..... Ha.

Russ T
 
jscandale said:
Wow, nice. What is the burn rate comparable to?

JS

They place it between RL15 and Varget. I find it to be a little faster. I am at the top of the load pressure with my rifle at 42.8. The whole reason I went with this powder is the claim of being temperature stable. It is to be the first in a line of Alliant powders that will boast temperature stability. I have to say I am quite pleased. I was using RL15, but this is my powder now. I'm glad I went with it.

Tank
 
Rtheurer said:
JS

Its right there with R15 and Varget, 4064, 2520, N140. I have some but have not found time to test it yet.

Tank
Thanks for the report. What is the barrel length on your shootin iron? Im looking to try it in a 6BR 30" barrel and a 30 Palma 308. Glad you got such good results, the only bad part is thats there is nothing left to blame its all on you now if you miss..... Ha.

Russ T

Russ,
I'm using a 28" 1:12 Lothar Walther barrel. I couldn't be happier with it. Looking forward to hearing your results. Your right about the only blame will be on me.

Tank
 
I'll have to try it. I remember reading about it when it came out. I have been using RL15 for a long time, but I will be working on a new wildcat this week that this might just be a perfect fit for.

JS
 
That is some impressive load data. May have to get a keg now although I'm on an XBR kick at the moment. If you've used 8208 for similar loads what are you thoughts? I've found the 168-170 range to be its upper limit in my combos.

Do you have any case fill % numbers? I have 0 experience with RWS.
 
I would put the burn rate closer to the 4895 variants than either RL15 or Varget. It is some very impressinve powder. Great going Alliant!!
 
Romulus said:
That is some impressive load data. May have to get a keg now although I'm on an XBR kick at the moment. If you've used 8208 for similar loads what are you thoughts? I've found the 168-170 range to be its upper limit in my combos.

Do you have any case fill % numbers? I have 0 experience with RWS.

I've never tried 8208. I never really had a need for that powder and to be quite honest, I've never really considered it for anything I own. I did however do some fill weight testing with H2O. Here are my samples

RWS 56.0grn
LC Match 87 55.2grn
LC Match 85 54.2grn
Win Super X 57.3
Federal 56.2
Remington 56.0
Norma 56.7

So I would say it is about average for water capacity. My fill on the case is about 87-90%. It just starts to come into the shoulder. I use a 4" drop tube with my funnel, so w/o the tube it my fill a little more than what I am seeing.

Tank
 
tclaunch said:
I would put the burn rate closer to the 4895 variants than either RL15 or Varget. It is some very impressinve powder. Great going Alliant!!

I completely agree. It is definitely quicker. I was expecting a 43.0-44.0 grain max, but really I am at max for my rifle at 42.8gn. I did shoot a load at 43 and 43.5. I was getting a sticky bolt with both and ejector marks with the 43.5.

Tank
 
jscandale said:
I'll have to try it. I remember reading about it when it came out. I have been using RL15 for a long time, but I will be working on a new wildcat this week that this might just be a perfect fit for.

JS

RL15 is all I used. I played around with TAC, 4064, Varget, and 4895 in 175 grain bullets. Always went back to RL15. This AR powder is shooting really well. I may try it with 175's at some point to see what it does. Right now I'm not touching anything.

Tank
 
liltank,

I am in the same boat, always came back to RL15. Always used it in the .223 and have had great results in the 6mm Hagar and some other wildcats that I tinkered with. I'll have to try AR Comp in the 6mm Hagar and the another 6mm wildcat that I'm tinkering with. Please, keep the results coming!

JS
 
I bought an 8lb jug of Alliant PowerPro 2000MR recently, and had had a hard time finding much load data for it. I intended to use it with 75-90gr bullets in 223 loads, but am also going to try it in a 24" bbl'd 6 RAT.

From what I've seen on Alliant's website, ARComp is faster than RL15, while PP2000MR is a tad slower. Since RL15 is one of the best numbers I've yet tried in the RAT, I'm thinking 2000MR could be a bit better yet.

I'm looking forward to more reports from shooters who're trying both these new numbers from Alliant....
 
flatlander said:
I bought an 8lb jug of Alliant PowerPro 2000MR recently, and had had a hard time finding much load data for it. I intended to use it with 75-90gr bullets in 223 loads, but am also going to try it in a 24" bbl'd 6 RAT.

From what I've seen on Alliant's website, ARComp is faster than RL15, while PP2000MR is a tad slower. Since RL15 is one of the best numbers I've yet tried in the RAT, I'm thinking 2000MR could be a bit better yet.

I'm looking forward to more reports from shooters who're trying both these new numbers from Alliant....

I've read somewhere that the 2000 isn't very temp stable. I would be sure to write down all your data at different temps, especially if you are shooting competitions.

Tank
 
Tank, What I've seen with most of the newer ball powders from RamShot & others is that they're not nearly as temp sensitive as most of the older, surplus ball powders like BL-C2, H335, AA2520, etc. Yeah, they're not as temp stable as Hodgdon's Extreme series of single base extruded powders, but there's been a lot of improvement over the years since the 1940s when ball powders were first developed.

And it's not just ball powders that are temp sensitive - any of the double-based powders - like Alliant's Reloder & Viht's N500 series - are more sensititve to temp changes than most of the single based extruded numbers. Obviously, there's a lot of shooters who're willing to deal with this factor - otherwise, we wouldn't be blessed with the wide selection of newer double-based propellants that are available today.
 
flatlander said:
Tank, What I've seen with most of the newer ball powders from RamShot & others is that they're not nearly as temp sensitive as most of the older, surplus ball powders like BL-C2, H335, AA2520, etc. Yeah, they're not as temp stable as Hodgdon's Extreme series of single base extruded powders, but there's been a lot of improvement over the years since the 1940s when ball powders were first developed.

And it's not just ball powders that are temp sensitive - any of the double-based powders - like Alliant's Reloder & Viht's N500 series - are more sensititve to temp changes than most of the single based extruded numbers. Obviously, there's a lot of shooters who're willing to deal with this factor - otherwise, we wouldn't be blessed with the wide selection of newer double-based propellants that are available today.

I agree completely. I just can't ever seem to get the Ramshot powders to give me low ES's. I have shot good groups, but my ES is all over the place.

An update on the AR Comp. Finally started playing with it using 175 Berger OTM's. Accuracy has been good and one load produced a 5 fps ES with a 3fps SD. It shot okay, but need to tighten up a flyer.
 

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