BRA Does NOT Guarantee "Harry" a World Record

[falconpilot]

Anyone that knows me, knows that I've shoot a Dasher for years- my nickname amoung some shooting friends is JimmyDasher - I recently picked up a IBS gun that was chambered in 6BRA. I'd planned on shooting it some but work kept me from making the events. I let me buddy borrow the gun, loaded up 200 rounds with new brass and with the info the previous owner had provided(doesnt hurt knowing the previous owner happens to hold the now current 600 record). My buddy proceeded to shoot 18 groups with the gun(9 groups with virgin brass) that average out right around 2". I've shoot tens of thousands of rounds of Dasher and never gotten this consistency. I just had my last three new Dasher barrels reamer to 6BRA's..

 

[comagutsa]

Well today i gave up on my 6BRA. . Its now a tomato steak.. I tried and couldn't get crap that was consistent
There was a waste of $1000 AUS. And 900 rounds later
Back to the 6BRX till i can order a new barrel
Will give it 1 more go before i give up on the 6BRA. .

 

[johara1]

Heres my home range where I tune. This is a typical day. There are rare days it is decent and you have to capitalize on them. 1k tuning is not an easy way to go. I have shot small here. Not often. Montana is a windy sob. Glenn Kulzer who is leading our LG agg also tunes here. Its not ideal but we manage. I have though of holding a match here. But I dont know who would want to shoot here.

https://www.facebook.com/video.php?v=480736695658599

Alex, how many times has the whole relay DQed. at Montana, I saw that at Whitehorse....... jim

 

[Joe Salt]

Well here goes, I'm with Alex on this I test at 1000 yards, ladder testes have helped me shoot some small groups. And I test in the wind. don't know what most of you look for, but when it's windy I want the three shots in the test that are closes together that helps me with powder charge, then I play with seating depth to get the vertical out. Hope I'm explaining this right, but if there is no vertical but the shots are wide I'll add more powder. because I want it to shoot though the wind. And sometimes it's just a matter of a little more powder or seating depth.

Joe salt

 

[Alex Wheeler]

Alex, how many times has the whole relay DQed. at Montana, I saw that at Whitehorse....... jim

Jim, Im not talking about deep creek. Im talking about tuning at 1k in the wind. It can be done, we do it and have success. It is not easy, and can be frustrating. Too many guys that hold multiple records, win multiple national events, and do it barrel after barrel, season after season use this method. Its not the only way, but it is a way many choose for some reason.
I think learning to tune is the most valuable skill you can have in this game. No matter what method you use, get good at it. Try not to talk yourself out of a method before you even try it.

 

[JohnMill]

Things that I have done and seen that improved barrels:
- new crown (several times I have seen this to hold up, and a couple times where it grossly improved performance)
- new chamber (2 occasions seen a new chamber grossly improved a barrel)
- muzzle brakes: have seen barrels that would not shoot as well with a brake on
- barrel tuners: have seen barrels that would not shoot as well with a tuner on
IMO, if a barrel isn't showing promise within the first 200-rounds or less, it needs addressed or replaced.

New crown story: One of my current and best barrels to date, started out shooting respectable and was seeing 3" groups at 1000yds right out of the gate with it. At about 125-rounds noticed it seemed not to be shooting as good. One morning took it to my range and shot 3 groups, all in the 5" range. Took the barrel off, cut a new crown, and took it back to the range (a couple hours later) for 3 more groups, that all went in the 3's. Prior to cutting that new crown, two of us inspected the original crown hard with a 10X loupe and a 25X bore-scope, neither of us could see any issue. But the results on the target sure told a different story after cutting a new crown.
My 2-Cents

I Seen all that work just like Donovan said
John

 

[johara1]

Jim, Im not talking about deep creek. Im talking about tuning at 1k in the wind. I can be done, we do it and have success. It is not easy, and can be frustrating. Too many guys that hold multiple records, win multiple national events, and do it barrel after barrel, season after season use this method. Its not the only way, but it is a way many choose for some reason.
I think learning to tune is the most valuable skill you can have in this game. No matter what method you use, get good at it. Try not to talk yourself out of a method before you even try it.

Alex, You right on, what ever method that works for you..... You have to do the work, and you have to be anal I guess.... jim

 

[ASbobcat]

Well, a whole lot of world records have been set tuning that way and I still have not found a equivalent method of tuning. Positive compensation obeys all the laws of physics. I have to assume you have never done it.

Positive compensation? I tried to look that up in my physics book and couldn't find any information. Do you have a reference?

 

[Alex Wheeler]

Positive compensation? I tried to look that up in my physics book and couldn't find any information. Do you have a reference?

Not going to be in a "physics book". This link will give you the basic idea.
http://www.geoffrey-kolbe.com/articles/rimfire_accuracy/tuning_a_barrel.htm

 

[Alex Wheeler]

Well today i gave up on my 6BRA. . Its now a tomato steak.. I tried and couldn't get crap that was consistent
There was a waste of $1000 AUS. And 900 rounds later
Back to the 6BRX till i can order a new barrel
Will give it 1 more go before i give up on the 6BRA. .

I have had guys give up on the dasher too because of a bad barrel. If you cant make a case based off the BR shoot, its not the case. Any case based on a 6BR will shoot with a good barrel. I am not sure that you could base a 6mm off the BR case and make it not work even if you tried.

 

[Hoodoo]

I have had guys give up on the dasher too because of a bad barrel. If you cant make a case based off the BR shoot, its not the case. Any case based on a 6BR will shoot with a good barrel. I am not sure that you could base a 6mm off the BR case and make it not work even if you tried.

Bingo. That right there is all you need to know. If you have a barrel that won't shoot after 150 rounds on that case, scrap it. Barrels are expendable.

 

[ASbobcat]

Not going to be in a "physics book". This link will give you the basic idea.
http://www.geoffrey-kolbe.com/articles/rimfire_accuracy/tuning_a_barrel.htm

That is a very interesting read, and explains why I don't see vertical dispersion with relatively high ES common with RL17.
But It says ABSOLUTELY NOTHING about wind, nor does it suggest that there is an optimum distance at which to observe results! And notice that the groups pictured next to the last graph were fired at 50 meters.

 

[Alex Wheeler]

That is a very interesting read, and explains why I don't see vertical dispersion with relatively high ES common with RL17.
But It says ABSOLUTELY NOTHING about wind, nor does it suggest that there is an optimum distance at which to observe results! And notice that the groups pictured next to the last graph were fired at 50 meters.

He is doing it with rimfire.
If your tuning with positive compensation there is going to be a point when those bullets cross paths. You want that point to be at the target. We tune at the distance we shoot so we can find the exact powder charge that will make bullets of different speeds cross at the target. Some have tried to tune for a certain amount of vertical at a shorter range so the bullets should cross at the intended distance. Its all a crap shoot until you take it to distance. Wind is a fact of life and you just have to do the best you can with it. I choose to fight with wind vs fight with 100 yd tuning. To each his own.

 

[Stan Taylor]

We'll crap I am screwed I only have a 100yds and 300yds.

 

[Alex Wheeler]

We'll crap I am screwed I only have a 100yds and 300yds.

Who said you were screwed?

 

[Stan Taylor]

Who said you were screwed?

Me LOL

 

[ASbobcat]

He is doing it with rimfire.
If your tuning with positive compensation there is going to be a point when those bullets cross paths. You want that point to be at the target. We tune at the distance we shoot so we can find the exact powder charge that will make bullets of different speeds cross at the target. Some have tried to tune for a certain amount of vertical at a shorter range so the bullets should cross at the intended distance. Its all a crap shoot until you take it to distance. Wind is a fact of life and you just have to do the best you can with it. I choose to fight with wind vs fight with 100 yd tuning. To each his own.

I agree with "To each his own". I did not start this discussion, only responded to some who questioned my method.

 

[Area51]

I wish allot of folks i shoot with would read through this thread before wasting money, time, and emotional energy on the latest craze wammy doodle cartridge variation.
Thank you for posting "Harry". finally something that makes sense.

 

[Alex Wheeler]

Maybe @CaptainMal will update the thread since he has found the powder his barrel likes.

 

[Eric Leonard]

I have had guys give up on the dasher too because of a bad barrel. If you cant make a case based off the BR shoot, its not the case. Any case based on a 6BR will shoot with a good barrel. I am not sure that you could base a 6mm off the BR case and make it not work even if you tried.

I have had guys give up on the dasher too because of a bad barrel. If you cant make a case based off the BR shoot, its not the case. Any case based on a 6BR will shoot with a good barrel. I am not sure that you could base a 6mm off the BR case and make it not work even if you tried.

I had an 8 twist Krieger .236 4 groove 6mm BR-DX that would shoot an easy 2 inches at 600 yards,,,,I wore it out shootin eggs ,suckers and gumballs,,I almost did a 6BRA this time but the 135 BIB`s convinced me into a 6.5x47L with an experimentally long freebore,,I will let yall know how it goes in the coming weeks,,

I really liked the BR-DX ,,,it is very close to the BRA and the Dasher and really dont understand why it wouldnt shoot with either,,in a good barrel of course,,