Ask RBros Thread

[gutsnthegrass]

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.

[Taco280AI]

How accurate is it now?

[gutsnthegrass]

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".

[rbros]

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.

[gutsnthegrass]

Yes, I would get rid of the stock as well so I could run a heavier contour barrel. 

[gutsnthegrass]

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? 

[rbros]

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.

[coop2424]

What kind of barrel life can you expect out of a .260AI? Pushing it mid to high range in speed?

[Mxracer532]

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?

[rbros]

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. 

[rbros]

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

[b23]

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?

[rbros]

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

[jasnt]

I'd like to hear what kind of speed your getting out of the 7 rogue and a 180.

[rbros]

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