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Author Topic: Ask RBros Thread  (Read 14743 times)

Offline Jolten

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Re: Ask RBros Thread
« Reply #25 on: August 23, 2016, 05:34:50 PM »
Reloading .308 using BLC2 powder, BR2 primers. 165gr HPBT Sierra GameKings loaded at 2.626COAL.

Powder weights from 40.5gr to 43.5. First 2 shots would touch. 3rd shot varied between 1/4 to 1inch apart from the first 2. And never straying in the same direction.

For example 40.5 gr first 2 shots would touch. 3rd would hit upper right 1/2 inch away from the first 2.

With 43.5 first 2 would touch. 3rd was 3/4 in lower left.

Any ideas on what would cause this? There was about a 3-4 min break between shots with 10min between groups. Using a Savage 10t with a 1-10 twist.

It could be a matter of cheekweld.  You may be able to be consistent for a couple shots then you position changes.  You might try shooting 3 shots in a row and not pick your head up of the rifle while working the bolt.  Try to find a reference point on your face where it touches the stock and keep that position the same.  Identical concept to an anchor point in archery.

I am leaning towards form since you are always getting two shots to touch and there is no consistency where the 3rd is going.

Hmm.... I'll have to try that. If it was that simple I might kick my own butt for that.
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Offline WoodlandShooter

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Re: Ask RBros Thread
« Reply #26 on: August 25, 2016, 01:31:11 PM »
building an AR10 (DPMS) looking for a 22" 7.3 or 7.5 twist barrel in 243. Want it to be relatively light, but also hold zero for strings up to 15 rounds per stage. Using a JP lightweight carrier, and a adjustable gas block.

what contour on the barrel, and will you build the barrel assembly?

Offline rbros

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Re: Ask RBros Thread
« Reply #27 on: August 26, 2016, 10:04:06 AM »
building an AR10 (DPMS) looking for a 22" 7.3 or 7.5 twist barrel in 243. Want it to be relatively light, but also hold zero for strings up to 15 rounds per stage. Using a JP lightweight carrier, and a adjustable gas block.

what contour on the barrel, and will you build the barrel assembly?

I think our buddy Glen Seekins is running his AR10 barrel at a .750-.800 at the muzzle in a 24" barrel.  I certainly wouldn't go any smaller than that.  Unfortunately, I don't do any AR10 barrels at this time.  I used to, but unless a guy had a premium upper, accuracy was hit or miss.  Had the most problems with DPMS uppers and their consistency.  Drop the same barrel into a premium billet upper and they shot lights out.
R Bros Rifles
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Offline andersonjk4

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Re: Ask RBros Thread
« Reply #28 on: August 26, 2016, 10:23:15 AM »
Do you do any re-barreling of metric threaded actions... Weatherby, Howa, etc?

Offline rbros

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Re: Ask RBros Thread
« Reply #29 on: August 26, 2016, 12:08:44 PM »
Sorry, Remington's and customs only
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Offline gutsnthegrass

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Re: Ask RBros Thread
« Reply #30 on: August 26, 2016, 12:44:57 PM »
I have a Model 700 mountain rifle in .260.  I have been kicking the idea around about rebarreling it with a longer barrel with more twist .  I have also thought about turning it into a .260AI.  Do you think this would be worth it for accuracy.  The thin short barrel on the mountain rifle is fine, but I want to turn this into a shooter as I really like the .260 rem caliber.

Thanks for any info.

Offline Taco280AI

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Re: Ask RBros Thread
« Reply #31 on: August 26, 2016, 12:50:36 PM »
How accurate is it now?

Offline gutsnthegrass

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Re: Ask RBros Thread
« Reply #32 on: August 26, 2016, 02:34:55 PM »
Eh, I can get 1" groups with my handloads.  I would like to customize it though.  I know this caliber can do better than 1".

Offline rbros

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Re: Ask RBros Thread
« Reply #33 on: August 26, 2016, 02:35:32 PM »
I have a Model 700 mountain rifle in .260.  I have been kicking the idea around about rebarreling it with a longer barrel with more twist .  I have also thought about turning it into a .260AI.  Do you think this would be worth it for accuracy.  The thin short barrel on the mountain rifle is fine, but I want to turn this into a shooter as I really like the .260 rem caliber.

Thanks for any info.

A long thin barrel usually isn't the best for accuracy.  A guy could run a 24" #3 and still get great accuracy with either a 260 or 260AI.  The LW Hunters in my version of the 260AI run a contour similar to a #4 and are still sub .25 moa rifles.  Rumor has it one of my buddies shot a 1.54" 3 shot group at 1k with his.  Not bad for a lightweight rig.
R Bros Rifles
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Offline gutsnthegrass

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Re: Ask RBros Thread
« Reply #34 on: August 26, 2016, 02:39:48 PM »
Yes, I would get rid of the stock as well so I could run a heavier contour barrel. 

Offline gutsnthegrass

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Re: Ask RBros Thread
« Reply #35 on: August 26, 2016, 02:41:34 PM »
What is your opinion on the leaving it a .260 or changing it .260AI?  Is there much advantage?  Or is it a waste of time and money? 

Offline rbros

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Re: Ask RBros Thread
« Reply #36 on: August 26, 2016, 04:07:19 PM »
My AI version will run close to 3100 in a 26" barrel with 140's.  It can be pushed harder, but this is a nice mild load and super accurate.  The 260 will run 2950-2975 with a 140 using todays powders.
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Offline coop2424

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Re: Ask RBros Thread
« Reply #37 on: August 26, 2016, 06:00:38 PM »
What kind of barrel life can you expect out of a .260AI? Pushing it mid to high range in speed?

Offline Mxracer532

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Re: Ask RBros Thread
« Reply #38 on: August 26, 2016, 08:11:42 PM »
What is your go to 7mm Rem mag load?
I have 1st gen Sendero I had loaded up 168gn Berger VLDs Win Std primer 72gn of Retumbo and got it to shoot about .76 or so. I then sent it to Straight Shooters Supply in Oregon and had them Bed the action and install a Muscle Brake and recrown and tune the trigger to a crisp 2lbs. Got the rifle back and the same load I barely got it to shoot a 1.2 or so group. What gives???
I loaded some ELD-X's today some with retumbo and some with H1000 and Started at touching the lands and backed off ten thousandths from 3450 COL (just kissing the lands) to 3420 COL. With that said what is your method for seating depths on ELD-X bullets?
Avid ARCHERY deer and elk hunter.
Coyote killer in the off season.
MX Racer simi retired to practice when I can.

Offline rbros

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Re: Ask RBros Thread
« Reply #39 on: August 27, 2016, 10:53:37 AM »
What kind of barrel life can you expect out of a .260AI? Pushing it mid to high range in speed?

Since we are using slower powders it should bea little longer than the normal 2500 rd 260 barrel life. 
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Offline rbros

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Re: Ask RBros Thread
« Reply #40 on: August 27, 2016, 10:58:36 AM »
What is your go to 7mm Rem mag load?
I have 1st gen Sendero I had loaded up 168gn Berger VLDs Win Std primer 72gn of Retumbo and got it to shoot about .76 or so. I then sent it to Straight Shooters Supply in Oregon and had them Bed the action and install a Muscle Brake and recrown and tune the trigger to a crisp 2lbs. Got the rifle back and the same load I barely got it to shoot a 1.2 or so group. What gives???
I loaded some ELD-X's today some with retumbo and some with H1000 and Started at touching the lands and backed off ten thousandths from 3450 COL (just kissing the lands) to 3420 COL. With that said what is your method for seating depths on ELD-X bullets?

My go to load wouldn't do you much good. My 7rm chamber is a lot different that a factory rifle or other customs.  Using my data would not be safe and lock up the bolt on a factory rifle.  You are right there with your info on a factory load. I would try a mag primer though.  Sometimes when shops install brakes it can change accuracy.  This is typically due to the brake not being aligned or they went to fast during the machining process and opened up the bore at the muzzle.  Both are detrimental to accuracy.  Most all of the eld-x bullets will shoot in the .010-.020 of the lands range
R Bros Rifles
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Offline b23

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Re: Ask RBros Thread
« Reply #41 on: August 27, 2016, 12:26:06 PM »
Travis, could you give a bit more information as to what is all different with your 7Rem mag. compared to SAAMI 7Rem Mag.

I'm assuming you must be improving the case but are you only changing shoulder angle or are you pushing the shoulder forward as well?  What is the overall H20 case capacity?

Offline rbros

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Re: Ask RBros Thread
« Reply #42 on: August 27, 2016, 04:11:01 PM »
Travis, could you give a bit more information as to what is all different with your 7Rem mag. compared to SAAMI 7Rem Mag.

I'm assuming you must be improving the case but are you only changing shoulder angle or are you pushing the shoulder forward as well?  What is the overall H20 case capacity?

It's the throat design on the 7rm that's different.  The body dimensions are changed slightly to give better case life as well.  I do have an improved one as well that I have been running for a few years
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Offline jasnt

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Re: Ask RBros Thread
« Reply #43 on: August 27, 2016, 04:28:29 PM »
I'd like to hear what kind of speed your getting out of the 7 rogue and a 180.
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"... we cannot change the fact that people will act in a certain way. We cannot change the inevitable. The only thing we can do is play on the one string we have, and that is our attitude. I am convinced that life is 10% what happens to me and 90% of how I react to it. And so it is with you... we are in charge of our Attitudes."
Charles R. Swindoll

Offline rbros

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Re: Ask RBros Thread
« Reply #44 on: August 27, 2016, 04:42:00 PM »
The 7 rogue will 3150 pretty easily.  My improved 7rm design does the same thing as well.  Both will get up to 3200 in a max charge with 27" barrels
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Offline jasnt

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Re: Ask RBros Thread
« Reply #45 on: August 27, 2016, 06:51:20 PM »
That's pretty impressive. That's deff on my wish list
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"... we cannot change the fact that people will act in a certain way. We cannot change the inevitable. The only thing we can do is play on the one string we have, and that is our attitude. I am convinced that life is 10% what happens to me and 90% of how I react to it. And so it is with you... we are in charge of our Attitudes."
Charles R. Swindoll

Offline Mxracer532

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Re: Ask RBros Thread
« Reply #46 on: August 28, 2016, 07:39:16 AM »
What is your go to 7mm Rem mag load?
I have 1st gen Sendero I had loaded up 168gn Berger VLDs Win Std primer 72gn of Retumbo and got it to shoot about .76 or so. I then sent it to Straight Shooters Supply in Oregon and had them Bed the action and install a Muscle Brake and recrown and tune the trigger to a crisp 2lbs. Got the rifle back and the same load I barely got it to shoot a 1.2 or so group. What gives???
I loaded some ELD-X's today some with retumbo and some with H1000 and Started at touching the lands and backed off ten thousandths from 3450 COL (just kissing the lands) to 3420 COL. With that said what is your method for seating depths on ELD-X bullets?

My go to load wouldn't do you much good. My 7rm chamber is a lot different that a factory rifle or other customs.  Using my data would not be safe and lock up the bolt on a factory rifle.  You are right there with your info on a factory load. I would try a mag primer though.  Sometimes when shops install brakes it can change accuracy.  This is typically due to the brake not being aligned or they went to fast during the machining process and opened up the bore at the muzzle.  Both are detrimental to accuracy.  Most all of the eld-x bullets will shoot in the .010-.020 of the lands range

I have shot both mag primers and STD and the STD primers in every load I tried shot better then mags.
I realize your load would be way different. Still curious what powder/primers work best for you.
Avid ARCHERY deer and elk hunter.
Coyote killer in the off season.
MX Racer simi retired to practice when I can.

Offline rbros

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Re: Ask RBros Thread
« Reply #47 on: August 28, 2016, 09:56:04 AM »
I use retumbo and 215m primers in all my 7 mag stuff. 
R Bros Rifles
www.rbrosrifles.com

Offline andersonjk4

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Re: Ask RBros Thread
« Reply #48 on: August 29, 2016, 08:10:31 AM »
I use retumbo and 215m primers in all my 7 mag stuff.

Curious what powder/primer combo you run in your .300 Win Mags?

Offline rbros

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Re: Ask RBros Thread
« Reply #49 on: August 29, 2016, 09:17:04 AM »
H1000 and 215m or cci250 primers
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