Sizing new brass...

[ole farmerbuck]

After trying to chamfer some new .204 brass, I neck size new brass now.It was cutting in on some spots on the brass and hardly touching in other places. I couldnt tell by looking that the necks were dinged but the chamfer tool showed it.

 

[Walkalong]

but the chamfer tool showed it.

Yes, to do this right, the necks must be round, and square.

 

[steve4102]

The bottom line being that unless you are certain about the internal dimensions of a sizing die you are essentially plunging your new case into a sizing die's risky unknown. So what possible advantage is to be gained?

There is nothing "risky unknown" about the internal dimensions of a sizing die.

I "know" that the sizing die I am using is set up to size my brass to fit my chamber. I do not have to know how much my dies internal dimensions differ from your die or anyone else's die. I do not care if your die differs from mine, I will be using mine not yours.

If my die is out of spec and plunging "new" brass into it alters it's size and shape, GOOD, that is what I want, I want all my brass both New and Old to be sized with my out of spec die, so they are identical, even if they are wrong, they are identical.

 

[groundsclown]

I want all my brass both New and Old to be sized with my out of spec die, so they are identical, even if they are wrong, they are identical.

Ding ding ding winner winner chicken dinner.
Same reason I trim my new straight wall pistol brass...
CUN-SI-STAN-SEE

 

[Zeke/PA]

I size ALL new brass both rifle and pistol to avoid mostly bullet seating problems down the road.

 

[243winxb]

New 243 Win Bottle neck brass

Before loading the brass, as it came from the factory, a few things have to be checked. 1. Out of a bag of 100, 10 must chamber in the rifle with no problems. 2. The trim length must be at or under maximum. 3. The bullet should not fall into the case. I measure the neck diameter before and after seating a bullet. This tells me what i need to know about neck tension. 4. Bump the case mouth with an expander to make it round if needed. (Like Walkalong's Tool) At this time you can also check cartridge head clearance, head to datum. 5. Use a Sierra 85gr boatail bullet to expand the neck on seating. If you did run the new brass into my FL die, the shoulder may not move forward at all. Only firing will do this. Factory new brass is undersize for the most part. Now the flash hole gets uniformed. If trim length is all the same or close, i sort by 1/10 th gr. Hoping to get 50 brass that are within 3/10 gr. After firing the first time, brass is neck turned for the Rem 40X, not for the Rem. 600. In the 40X, groups on the first firing will average right around 3/4" @ 100 yds. About the 3 loading,using a FL bushing die, the unsided part of the neck will have expanded to the chamber ( sizing about 1/2 of the neck) Groups will be smaller now, some under 1" @ 300 yds if i do my part & read the wind correctly. Just how i do it. Your result may be different. Berger Bullets @ 300Yds. http://www.thehighroad.org/showthread.php?t=737261

 

[Rule3]

To me sizing factory new handgun brass is just loosing one load by working the brass that unneeded extra first time.

Your kidding right?

Dang I am going to get indefinite minus one, rather than indefinite reloads.?

 

[mokin]

You got new brass?! Things are definitely looking up. I almost always size new brass before I load it. Every now and then I don't.

 

[Rule3]

You got new brass?! Things are definitely looking up. I almost always size new brass before I load it. Every now and then I don't.

I am still working on my range brass from 5 years ago. Only brass I ever bought new was 45 Colt as you do not find them laying around. I sized them and even trimmed them, it was fun

 

[dagger dog]

years ago I had bullets almost fall into un-sized brand new brass,been sizing it ever since.Well worth the time,imho.

I had that happen with 45 Colt ( LC if you like to call it that), bought 100 new off the shelf sealed bag, 0.452" boolit dropped right to the bottom of an unprimed case, tried a few more same results.

Just wonder if they were NOS and had been run on tooling set up for the older 0.454" standard that was common pre WWII ?

Any way I size 'em all now even rifle, that way you have a starting point, for repeatability, you know every case in the batch will have be the same.

 

[gonoles_1980]

mokin took about a month of searching. But with the LCR 357 I can only fire 20-30 rounds of factory ammo before it becomes less fun from the kickback, more in the trigger. So I bought .357 brass to make my own lighter loads. I could fire a 100 of those and only just use up 100 rounds, and it's quite fun to fire.