how picky on brass

[George63]

OK, this will be based on a 7-08 with the goal of 1/2 moa at 600 yds

this picky work is being done after twice firing one lot of Win brass before annealing
so, a few items that I have not seen up for comment:

1) tolerance for neck thickness ( I am trying to measure and sort/ avoid turning)

2) tolerance for water volume ( I am thinking a .3 grain spread and it looks like the best that can be done on the water fill is + - .1 gr so the total variance would end up .5 gr water volume)

3) for brass of the same lot/ # of firings - if it is length trimmed, primer pocket uniformed, flash hole deburred, the base to shoulder is measured, the neck thickness is measured and the water volume is measured - what else is there ?

 

[jfseaman]

Re: how picky on brass

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: George63</div><div class="ubbcode-body">OK, this will be based on a 7-08 with the goal of 1/2 moa at 600 yds

this picky work is being done after twice firing one lot of Win brass before annealing
so, a few items that I have not seen up for comment:

1) tolerance for neck thickness ( I am trying to measure and sort/ avoid turning)

2) tolerance for water volume ( I am thinking a .3 grain spread and it looks like the best that can be done on the water fill is + - .1 gr so the total variance would end up .5 gr water volume)

3) for brass of the same lot/ # of firings - if it is length trimmed, the base to shoulder is measured, the neck thickness is measured and the water volume is measured - what else is there ? </div></div>1) Just turn it. Works better.
2) ok
3) don't understand

 

[George63]

Re: how picky on brass

# 3 is asking if there is any need to prep/ consider other factors for brass than the items listed

 

[MitchAlsup]

Re: how picky on brass

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: George63</div><div class="ubbcode-body">OK, this will be based on a 7-08 with the goal of 1/2 moa at 600 yds

this picky work is being done after twice firing one lot of Win brass before annealing
so, a few items that I have not seen up for comment:

1) tolerance for neck thickness ( I am trying to measure and sort/ avoid turning)

2) tolerance for water volume ( I am thinking a .3 grain spread and it looks like the best that can be done on the water fill is + - .1 gr so the total variance would end up .5 gr water volume)

3) for brass of the same lot/ # of firings - if it is length trimmed, the base to shoulder is measured, the neck thickness is measured and the water volume is measured - what else is there ? </div></div>

First question: What does it shoot like at 100 yards? Right now.

If you are shooting 0.5 Moa at 100 yards you should be able to shoot 0.5 MoA at 600 yards
{this part is almost entirely shooter and wind reading after moderate load developvent.}
Shooting 0.5 MoA at 800 is ~3X as hard as 500; shooting 0.5 MoA at 1000 yards is ~7.5X as hard.
To get proficient requires all three skills, load development is perhaps the easiest.

My opinion.

 

[lightman]

Re: how picky on brass

I would also uniform the primer pocket and deburr the flash hole.I use Sinclair tools for this.I also measure the runout on the bullet on the loaded round.Competition seaters like Redding or Hornady usually produce straighter ammo than other seaters.There are several stickies at the beginning of the reloading section about this. Lightman

 

[George63]

Re: how picky on brass

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lightman</div><div class="ubbcode-body">I would also uniform the primer pocket and deburr the flash hole.I use Sinclair tools for this.I also measure the runout on the bullet on the loaded round.Competition seaters like Redding or Hornady usually produce straighter ammo than other seaters.There are several stickies at the beginning of the reloading section about this. Lightman </div></div>

I considered the first 2 a given ( changed the first post) and the stickies/ other threads do not address tolerance levels for these items

concentricity is more of a load issue that has been over debated here recently

trying to keep this concentrated on brass prep

 

[FALex]

Re: how picky on brass

can I ask you all if you've experienced a significant difference when necks have been turned vs non-turned necks?

 

[George63]

Re: how picky on brass

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MitchAlsup</div><div class="ubbcode-body">
First question: What does it shoot like at 100 yards? Right now.

</div></div>

no idea, I do not bench shoot, load development for this is at 300 yd min - prone bipod

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MitchAlsup</div><div class="ubbcode-body">

If you are shooting 0.5 Moa at 100 yards you should be able to shoot 0.5 MoA at 600 yards
</div></div>
that would only be true in a vacuum - when a bullet travels through a fluid (air) dispersion will always increase with distance - any other results are from faulty or insufficient testing- this also has been debated extensively recently

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MitchAlsup</div><div class="ubbcode-body">
Shooting 0.5 MoA at 800 is ~3X as hard as 500; shooting 0.5 MoA at 1000 yards is ~7.5X as hard.
To get proficient requires all three skills, load development is perhaps the easiest.
My opinion. </div></div>
I agree with the opinion, but the question/ thread is on brass prep for 600 yds - not the ratio of difficulty vs distance

what is your input on the actual brass prep questions?

 

[George63]

Re: how picky on brass

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: FALex</div><div class="ubbcode-body">can I ask you all if you've experienced a significant difference when necks have been turned vs non-turned necks? </div></div>

neck turning will always have the edge, but to get the full benefit the chamber must be tuned/cut for the smaller finished neck dimension - usually means that ammo without the turned necks will not chamber

IMO careful sorting should be able to avoid turning for the best brass category, and the rest of the brass can be used elsewhere - question is: how good is good enough

 

[armorpl8chikn]

Re: how picky on brass

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MitchAlsup</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: George63</div><div class="ubbcode-body">OK, this will be based on a 7-08 with the goal of 1/2 moa at 600 yds

this picky work is being done after twice firing one lot of Win brass before annealing
so, a few items that I have not seen up for comment:

1) tolerance for neck thickness ( I am trying to measure and sort/ avoid turning)

2) tolerance for water volume ( I am thinking a .3 grain spread and it looks like the best that can be done on the water fill is + - .1 gr so the total variance would end up .5 gr water volume)

3) for brass of the same lot/ # of firings - if it is length trimmed, the base to shoulder is measured, the neck thickness is measured and the water volume is measured - what else is there ? </div></div>

First question: What does it shoot like at 100 yards? Right now.

If you are shooting 0.5 Moa at 100 yards you should be able to shoot 0.5 MoA at 600 yards
{this part is almost entirely shooter and wind reading after moderate load developvent.}
Shooting 0.5 MoA at 800 is ~3X as hard as 500; shooting 0.5 MoA at 1000 yards is ~7.5X as hard.
To get proficient requires all three skills, load development is perhaps the easiest.

My opinion. </div></div>

This is the most useful information you have received and you have flatly rejected same.


Mitch, don't tap on the fish bowl. Its more entertaining to watch them swim around unaware of the world beyond.

 

[George63]

Re: how picky on brass

useful - yes

recently covered in depth in other places - yes

pertinent to the reloading section - no

pertinent to the brass prep ?? - no

 

[427Cobra]

Re: how picky on brass

I don't care what band of brass, neck turning it will help in more ways than just concentricity, and it's not only for tight neck BR rifles, pick thickness that cuts 60-75% of the neck, I use Win 7-08 resized to 260Rem in my rifle, the brass is plenty capable of 1/2moa out to 1000 yards, IMHO weighing brass is a complete waste of time, and having a uniform internal volume is another complete waste of time if your not precisely weighing your powder to the kernel. My suggestion is to do nothing more to your brass, except annealing, work on the most accurate powder charge you can, seat all bullets by ojive length, and shoot all rounds thru a chronograph, a repeatable load with single digit SD/ES will shrink your groups at distance, then consider neck turning.