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What does my Cooper need?

 
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  #8  
Old 06-17-2011, 07:16 PM
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Re: What does my Cooper need?

Quote:
Originally Posted by rscott5028 View Post
I don't care if they trued the action with a bastard file and a claw hammer.
His PDF says he's shooting .105" groups. (@100yds?)
That's "blueprinted" by my definition.
So what your saying is I can't get any better?
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  #9  
Old 06-17-2011, 07:31 PM
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Location: Texas
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Re: What does my Cooper need?

Quote:
Originally Posted by rscott5028 View Post
I don't care if they trued the action with a bastard file and a claw hammer.
His PDF says he's shooting .105" groups. (@100yds?)
That's "blueprinted" by my definition.

I'm sorry you feel that way.

I have seen rifles shoot extremely good that were not blue printed. and all that it means is that
all of the parts that were not square canceled out each other (I in a Million chance) and that is not predictable.

It works both ways and some Blue printed rifles will not shoot ether but the odds much are better.

Also the picture of the muzzle shows a crown.

The reason That I ask the questions is the poster was asking and more information was nessary
to give him a good answer.

I doubt that Cooper would ship out a rifle that was not blue printed or crowned but stranger
things have happened.

I have also seen targets and group sizes that were sent out by the factory that were bogus
and misleading. That is why I ask that question.


J E CUSTOM
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  #10  
Old 06-17-2011, 08:14 PM
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Re: What does my Cooper need?

Thanks, I guess I seen a crown as taking off the end of the rifling at an angle, which my rifle doesn't have.

So basically there really isn't anything I could or should do to this rifle to make it any more accurate?
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  #11  
Old 06-17-2011, 11:25 PM
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Location: Texas
Posts: 5,509
Re: What does my Cooper need?

Quote:
Originally Posted by B-RAD View Post
Thanks, I guess I seen a crown as taking off the end of the rifling at an angle, which my rifle doesn't have.

So basically there really isn't anything I could or should do to this rifle to make it any more accurate?

Beveling the rifling is mainly to make it easier on patches and cleaning from the muzzle (Not
recommended).

The idea and function of a good crown is to allow the gas a uniform way to escape from behind
the bullet at the moment it leaves the barrel.

If the bevel (if used) or the crown is not absolutely uniform It will have an effect on the bullet
by allowing more gas to escape from one side than the other, in effect kicking the base of the
bullet to one side(Off the center line of the bore)destroying accuracy.

The edge of the bore should be square and clean/sharp. the angle of the crown is mostly a
personal thing. I like a 11o crown that is recessed for protection.

The only thing that I would suggest to try and improve the accuracy in an already fine shooting
rifle is to adjust bullet seating depth a few thousandths at a time in or out and watch for any
improvements. also check and improve concentricity if your re loads need it.

J E CUSTOM
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  #12  
Old 06-18-2011, 08:21 AM
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Join Date: Apr 2010
Location: Allen, TX
Posts: 2,608
Re: What does my Cooper need?

Quote:
Originally Posted by J E Custom View Post
I'm sorry you feel that way.

I have seen rifles shoot extremely good that were not blue printed. and all that it means is that
all of the parts that were not square canceled out each other (I in a Million chance) and that is not predictable.

It works both ways and some Blue printed rifles will not shoot ether but the odds much are better.

Also the picture of the muzzle shows a crown.

The reason That I ask the questions is the poster was asking and more information was nessary
to give him a good answer.

I doubt that Cooper would ship out a rifle that was not blue printed or crowned but stranger
things have happened.

I have also seen targets and group sizes that were sent out by the factory that were bogus
and misleading. That is why I ask that question.


J E CUSTOM
JE,

I know what you mean and I agree. Unfortunately, sarcasm and dry humor doesn't always go over well in my posts.

Lots of people have ideas about what constitutes "blueprinting". Some shave a lot of metal here and there and don't really accomplish anything. Others make fine adjustments with excellent results.

Cooper makes really nice rifles and if it's consistently shooting sub-quarter MOA, I see no reason to mess with the rifle.

That doesn't mean that the loads/groups can't be improved on. But, for long range, I'd be zeroing in on a single high BC bullet/load and then start practicing because technique and compensating for wind and other elements are the real challenges for practical applications and you aren't going to hone those skills from a bench at 100yds. ...that's a worthy endeavor. But, it's not what LRH is all about.

Regards!
-- richard
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  #13  
Old 06-18-2011, 03:53 PM
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Join Date: Jun 2011
Posts: 84
Re: What does my Cooper need?

Thanks guys I will leave the rifle alone and just work on loads. I'll let you know when I have one .224" sized hole from 5 bullets
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  #14  
Old 06-18-2011, 10:03 PM
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Join Date: Apr 2004
Location: Reno Nevada
Posts: 1,513
Re: What does my Cooper need?

I'd be satisfied with what its shooting now. Our military snipers make hits at extended ranges by learning all about ballistics and trajectory,and whats happening to that bullet in flight. Its one thing to have a 1/4 MOA rifle and another to know where to aim when its 30 degrees up a hill in a 10 mph cross wind at 461 yds. Especially if its shooting back at you.
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