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primer pocket cutting

 
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  #8  
Old 04-11-2006, 09:52 PM
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Join Date: Dec 2001
Location: Pennsylvania
Posts: 230
Re: primer pocket cutting

Col48,
Don't weigh em twice. Prep em first and use them all.
Depends on how many cases you have to determine the level of sorting you wish to go to. I use a bell method. If you have for example 50 winchester cases, get em all prepped and start weighing. Set them in full and half grain rows. Example 187 -187.5 one row 187.5-188 another, etc till all the cases are weighed. Probably end up with something like:

187 - 1
188 - 1
189 - 8
190.5 - 12
191 - 15
191.5 - 8
192 - 4
192.5 - 1

In this case, the 35 from 190.5 to 192 would be shot together to fireform and set aside for future good stuff. (Final fine tuning, development of the drop chart, Extreme range woodchucks, hunting, etc.)

The light ten and heavy five would get used and abused doing 3 shot group variations against each other. Then when you have your load all figured out. Shoot a few 5 shots with the light ones vs the heavy ones on out there a ways to judge for yourself the weighing and it's effects at long ranges.

That is for setting up a hunting gun. Match gun where you know you will wear out the cases, you may still have 7-8 groups but now they are with a little more consistent brass or at least more of them. The same bell curve sorting goes on but the rows become .1 grain instead of .5 grain and cases more around a hundred or two.

Careful now. You start doing all this stuff and you can become more and more anal about it. Case in point. I've been developing a load for what I just wanted to be a chuck gun. Brass was sorted to the .5gr level. Had a steady cross wind on a river flat and sent five of one of my prospective recipes down to 475. Shots 1 and two both registered 3149 on my trusty Chrony. They were .635 inches apart shots 3,4, and 5 were 3 inches to the right and 1.5 inches higher and clumped .615 inches apart. 3137,3134,3136. You get to thinking if I would have just sorted to .1, slower speed must have allowed more wind drift. etc, etc and drive yourself crazy. Well heck I'll admit it, I'm going to buy more brass.
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  #9  
Old 04-12-2006, 06:55 AM
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Join Date: Jul 2005
Location: South Africa
Posts: 47
Re: primer pocket cutting

Speaking of anal.. the first thing I do is to measure the case necks at 3 points with a tube/ball micrometer to check for consistency.I figure that of you have a case that is obviously thinner in one area of the neck, that discrepancy goes all the way through the case.
Then I do the weighing thing and yadayada..
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  #10  
Old 04-12-2006, 06:59 AM
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Join Date: Jul 2003
Location: Central PA
Posts: 1,310
Re: primer pocket cutting

GG -- 3 days after that post the rifle didnt let me down at a local g-hog match.

in fairly bad switchy conditions...maybe 15mph gusts

5 shot groups at 200,300,500...

200yds:
4 in 0.2"
5th made it about .4 (was actually the first shot that was out)

300yds: 3 in a cloverleaf
1 out left in a gust
driver error dropped a shot low
STILL under 1" total

500yds:
again 3 in a clover leaf
again one left in a gust
last shot was about 3/4" above the clooverleaf

group was 7/8" high by 1.9" wide

Had the smallest group at 500 and highest score against PPC's and light and heavy 1K guns.

These BR's are definitely addictive [img]/ubbthreads/images/graemlins/shocked.gif[/img]

I think I'll keep running the way i am for now...I love saving time on brass prep [img]/ubbthreads/images/graemlins/grin.gif[/img]

Taking it to 1K saturday hopefully

RE: testing Prep Steps in a more finicky case...

I disagree...with a less precise case/rifle setup, the differences might get lost in the noise...with this thing, the noise level is low, so it "should" be easier to see differences in performance.

JB
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  #11  
Old 04-12-2006, 07:04 AM
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Join Date: Jul 2003
Location: Central PA
Posts: 1,310
Re: primer pocket cutting

one thing to add -- cases are also weight sorted within a 50rd ammo box...but the weight gradient within the box was destroyed after ultrasonic cleaning.

weight span is about .5gn over the 50rd box.

FH's were then LIGHTLY deburred, NO chamfer, NO opening of the FH

mouths were lightly deburred.

Groups in the above post came from 1x fired cases sized in a Custom Harrell FL die with 0.0015 shoulder bump and a .267 bushing (NO EXP BALL)

oddly, the .267 bushing actually gives a nk diam of 0.2682"

loaded rd = 0.2695"

Seems i might be doing less prep on my next Comp rifle too(coming next week)

Im so happy at the thought of NOT having to ream primer pockets!

JB
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  #12  
Old 04-12-2006, 09:42 AM
Silver Member
 
Join Date: Feb 2006
Location: Nottingham, UK
Posts: 261
Re: primer pocket cutting

[ QUOTE ]
Col48,
Don't weigh em twice. Prep em first and use them all.
Depends on how many cases you have to determine the level of sorting you wish to go to. I use a bell method. If you have for example 50 winchester cases, get em all prepped and start weighing. Set them in full and half grain rows. Example 187 -187.5 one row 187.5-188 another, etc till all the cases are weighed. Probably end up with something like:

187 - 1
188 - 1
189 - 8
190.5 - 12
191 - 15
191.5 - 8
192 - 4
192.5 - 1

In this case, the 35 from 190.5 to 192 would be shot together to fireform and set aside for future good stuff. (Final fine tuning, development of the drop chart, Extreme range woodchucks, hunting, etc.)

The light ten and heavy five would get used and abused doing 3 shot group variations against each other. Then when you have your load all figured out. Shoot a few 5 shots with the light ones vs the heavy ones on out there a ways to judge for yourself the weighing and it's effects at long ranges.

That is for setting up a hunting gun. Match gun where you know you will wear out the cases, you may still have 7-8 groups but now they are with a little more consistent brass or at least more of them. The same bell curve sorting goes on but the rows become .1 grain instead of .5 grain and cases more around a hundred or two.

Careful now. You start doing all this stuff and you can become more and more anal about it. Case in point. I've been developing a load for what I just wanted to be a chuck gun. Brass was sorted to the .5gr level. Had a steady cross wind on a river flat and sent five of one of my prospective recipes down to 475. Shots 1 and two both registered 3149 on my trusty Chrony. They were .635 inches apart shots 3,4, and 5 were 3 inches to the right and 1.5 inches higher and clumped .615 inches apart. 3137,3134,3136. You get to thinking if I would have just sorted to .1, slower speed must have allowed more wind drift. etc, etc and drive yourself crazy. Well heck I'll admit it, I'm going to buy more brass.

[/ QUOTE ]

thanks for that i will give it a try,theres one thing for sure it can not heart can it.
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  #13  
Old 04-12-2006, 10:15 PM
Silver Member
 
Join Date: Dec 2001
Location: Pennsylvania
Posts: 230
Re: primer pocket cutting

Very nice JB,
Congrats! Is that a 6BR you are working with?
Shummy
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  #14  
Old 04-13-2006, 08:33 AM
Platinum Member
 
Join Date: Jul 2003
Location: Central PA
Posts: 1,310
Re: primer pocket cutting

[ QUOTE ]
Very nice JB,
Congrats! Is that a 6BR you are working with?
Shummy

[/ QUOTE ]

Shum -- yea, straight br, no-turn .272nk

JB
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