ATRS Modern hunter specs, pics and range reports

[orthoboy]

Here's the setup from today. A couple of notes:

The first thing I did was send 4, 5-round groups, starting from upper left and going clockwise. 1: Federal Sierra Gold Medal Match - 168r gr; 2(upper right) Hornady 165 gr GNX Superperformance; 3:Nosler Custom Competition 168 gr HPBT; 4 (lower left): repeat to verify, Nosler Custom Competition 168r HPBT.
The centre of the target is back to the Federal Gold Medal match, fired as fast as I could, using the XCR-M 308 10 round pistol magazine.
Groups measured (outer edges) .68, 1.0, 1.58, 1.8, 2.6. You can deduct .308 if you like. I'm pretty happy with all of the ammo but now I know what she really likes.

The final target is rapid firing of 4 magazines containing 5 and 6 rounds of the Austrian Hirtenbirger 308/762, made in 1975, Berdan Primer. No real effort was made other than enjoying zero failures. Barrel was starting to warm up.

Thanks to StormChaser for teaching me the way to squeeze the rear bag for stability. What a major difference you made!

 

[GUB]

Interested in the accuarcy of the Hurtin ammo, orthoboy? Did'nt JP have trouble running the Hurtin in his high end guns?
A while back ATRS frowned on useing any kind of surplus in these guns?
I wonder why?

 

[hawk-i]

Orthoboy, are those groups shot at 100 yards...if so they are looking great!

 

[orthoboy]

Yes.

 

[orthoboy]

Interested in the accuarcy of the Hurtin ammo, orthoboy? Did'nt JP have trouble running the Hurtin in his high end guns?
A while back ATRS frowned on useing any kind of surplus in these guns?
I wonder why?

The Hirten isn't hurten! But I did give it a good cleaning. I just ran out of targets so decided to blast away at the one (keeping the other for photos). I intentionally bought the Hirten for my SA M1A though.

 

[Pumpingravel]

I have a question about the assembly of the rifle. When you seperate the upper and lower is the buffer held in place? Mine was not so when I reassembled I pushed the buffer in and held it in place by turning the retention screw then reattached the upper and lower. After I loosened the retention screw so if I disassemble again the buffer won't be held in place but there will be no screw between the buffer and bolt.

Am I doing this right or can the screw be left to hold the buffer in place and there is no need to use the retention screw?

I'm guessing your buffer retention screw broke, should look like this, the tab at the end hangs down and holds the buffer in place while the rifle is apart. I think you're doing the right thing as that will allow you to continue using your rifle until you can get a new screw.

 

[purplezuk]

Just give them a call in the morning and I'm sure they fix you up asap.

 

[mytiburon]

Mine broke as well (and apparently one other before me). Not a big deal, atrs was great and quick to ship a free replacement. Maybe a stronger retainer is in order though?

 

[Artemis]

My buffer retention screw broke in the first few shots. ATRS had a couple replacements in the mail before i hung up the phone.

I think i would agree, stronger buffer retention screws in order. That little tab isnt a lot to hold that spring and buffer in place.

 

[alberta tactical rifle]

Mine broke as well (and apparently one other before me). Not a big deal, atrs was great and quick to ship a free replacement. Maybe a stronger retainer is in order though?

Already on it!! We have found several rifles that this has happened in so have beefed up the updated version and the notch is a radius rather than a 90 degree cut so should be far stronger.

Dr. hunter
Leaving the screw out totally will NOT hurt anything. just makes take down a PITA.
However, turning the broken screw in to retain the buffer WILL do damage to the buffer due to a lack of clearance.
PLEASE call us ASAP so we can get replacement parts out to you.

 

[alberta tactical rifle]

Interested in the accuarcy of the Hurtin ammo, orthoboy? Did'nt JP have trouble running the Hurtin in his high end guns?
A while back ATRS frowned on useing any kind of surplus in these guns?
I wonder why?

A vast majority of "surplus" ammo is cheap offshore crap intended for use in a machinegun, as a result the pressures are much higher and the primers harder than what the hammer spring in the match trigger can light up. Corrosive components also are a concern especially from Eastern block or Asian manufacturers.

 

[Picatinny]

Already on it!! We have found several rifles that this has happened in so have beefed up the updated version and the notch is a radius rather than a 90 degree cut so should be far stronger.

Dr. hunter
Leaving the screw out totally will NOT hurt anything. just makes take down a PITA.
However, turning the broken screw in to retain the buffer WILL do damage to the buffer due to a lack of clearance.
PLEASE call us ASAP so we can get replacement parts out to you.

Just curious, when did these updates begin?
Will be looking for this 90 degree radius.
Thanks,
JK

 

[alberta tactical rifle]

Just curious, when did these updates begin?
Will be looking for this 90 degree radius.
Thanks,
JK

Last week

 

[ezkmo]

Nice shooting Orthoboy

Wow those Nosler Custom Competition 168r HPBT groups look really good.

Anybody try some factory lapua 167gr yet. I always had great results in my 308's with that ammo.

 

[mytiburon]

Another quick report on my 260 18.6"

I am still using h4350 for all loading. I have used 129 accubold LR and 140 AMAX
Overall using the same charge amounts the 140 AMAX shot Faster than the 129 Accubond LR to the tune of about 25 FPS on average
The 260 Does not like the 129 Accubonds, i have to load them 2.85 COAL which is .055" off the lands and it is a extremely tight mag fit
The Amax i load to 2.85 COAL as well but my jump to the lands is only .020" so much better mag fit
I have found my best group at 40.9GR but it failed to cycle properly through the whole magazine (.772" 3 shot group before 4th jammed)
My best low group was 41.2 GR which left me a 1.16" group including my flyer, without it the group was about .75MOA Bullet sped of 2550 FPS
My best high group was 42.5 GR which gave a 1.9" group but once again without the 5th flier gave me just under 1 MOA at 2670 FPS,looking at my groups 42.3Gr should be about the sweet spot at about 2650 FPS.
Anything over 42.5 grains and i see pressure signs,the primers are starting to crater and I have shot as high as 43.5 Grain and they carter very badly, I will get some pics up soon.
I also tried the Amax at the manual COAL of 2.8 and the group opened up very large.
Anyways i do have 2 groups now that I believe will be good if i do my part,so i will develop them a bit more and report back.

Overall takeaway is that it is looking more promising each time i shoot it, it has a very tight window between under gassed and overpressure. Also fairly happy with velocity for such a short barrel, should still have decent energy at 1000Y with the 140GR.Oh and that I have a few boxes of accubound LR to trade or sell.

 

[play.soccer]

**Image and video linking functions will be enabled after you have contributed more to the forum**

Thanks guys at ATRS for building my dream gun.**Image and video linking functions will be enabled after you have contributed more to the forum**

And when I get a modern varminter, it will look like this.

 

[rickspeed]

Just posting a great find.....
PMM (Parker Mountain Machine) produce this awesome QD sling mount made for the MagPul PRS stock.

 

[Picatinny]

Ok, I got mine a few weeks ago and it is bare bones with the exception of a muzzle break, medium 18.6" barrel and "ambi" controls.
My targets have been with inexpensive AE 150gr and they are 1.5"-3" but that is probably me.
A lot of tight groups of 4 then the fifth goes a little off target - I guess I get excited easily.
I have to get used to my FFP Sightron, breathing, trigger control and recoil impulse / follow through.
These are huge factors of course but the accuracy is coming as I will shoot better quality product after the break-in period.
Which for me will be after 200 rounds or so.
The break does an exceptional job but it is very loud.
A recent arrival in the mail was the upgraded "Buffer Retention Screw" - Thanks ATRS.
I separated the halves and I quickly noticed that the old retention screw was in pieces….
The buffer face was scored (though probably by the spring??) along with the back of the bolt.
Installed the new screw and I will take it up to the range on Saturday to see how it all comes together.
Here are some pics.

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[ATRS Shaun]

Well, I had a chance to head out to the range this weekend and got some quality time in behind my Modern Hunter. My reloading bench is still being put back together after renovating the basement, so I've been playing with factory ammo and the Federal Gold Medal Match 168gr Sierra match king variety has been giving me pretty good results. And since this is a range reports thread... Here goes. My scanner can't fit the full targets on, so they are cut into top and bottom with the middle target being scanned in both copies.

I started out at 100m, and was a bit uncomfortable behind my Tacmod stock, I had set the cheekrest too far forward, and length of pull too short. These first handful of groups are shot like that and they are definitely not my best groups.

I kept shooting with the stock the way it was, and my arm was starting to cramp from the short length of pull.

After shooting those three groups, I pulled out the allen keys and adjusted my stock, increased the length of pull by an inch and a half, and the position of my cheek rest and found my groove.

Once I got the stock adjusted, you can see the last two groups improved a bit. I ran out of paper at 100m so pushed out to 200m, and things only got better.

At .86 moa using factory ammo, with 250 rounds since cleaning, and with a hot barrel... I was pretty happy.
I had one target left to shoot, and part of me wishes I could consider 3 shot groups legitimate...



I'll let you guess which 3 shots came out first.

Just figured we needed some more targets up in here, so who's next!
I can't wait to start hand loading for this, I've been putting my bench back together all afternoon today.

 

[Gorno]

I am not sure if this has been addressed in the thread, as it was too long to read, but have any left handed owners commented? I am curious as to how easy the charging handle is to operate for lefties.