Reloaders: new brass to fired brass

[JMikeyH]

I've only ever reloaded with factory brass that has previously gone through my rifle, I'll be starting load dev on a new rifle soon and factory ammo is not readily available, I'll be buying a batch of new brass to keep going for a few reloads. When working out my COAL, is there any additional consideration with regards to finding lands that I won't have come across when using fireformed brass? I'll find the lands by full sizing a case, seating a bullet way too shallow in there and closing the bolt on it. I'm wondering if there might be a change in the depth the neck goes into the throat of the chamber with new brass, compared to fired brass

 

[Apthorpe]

Sounds like you're overthinking a non-problem. I'd just crack on as usual.

 

[ColinBr]

Only difference you'll see really is perhaps a few thousands of an inch in the headspace from new to fired brass from your rifle.

Nothing to worry about. Crack on

 

[Foxyboy43]

Hmmm.
When buying new brass the first thing I do is examine each, measure and if required trim to length. You might be surprised the variations in even the more expensive cases.
The old trick you describe works well but do it five times and measure each time for certainty…

 

[nocturnaldave]

Your bullet seating die presses from the base of your brass. It doesn’t know or care where the shoulder is. It won’t know any difference between old brass and new brass. Only exception will be a teeny weeny bit of difference in the neck tension from your old brass to new. Measure and adjust if required. If your chasing accuracy make sure you have at least fired each piece of new brass at least once. Most new brass tends to be a bit short to the shoulder and you can’t bump the shoulder back a couple of thou from your chamber size till your rifle has pushed it out on the first firing.

 

[steve19]

Hmmm.
When buying new brass the first thing I do is examine each, measure and if required trim to length. You might be surprised the variations in even the more expensive cases.
The old trick you describe works well but do it five times and measure each time for certainty…

1000% this!!!

I've had new lapua and norma brass that has been way out. Some of the norma stuff it would have been quicker to trim with a grinder it was that long.

 

[Smellydog]

Hmmm.
When buying new brass the first thing I do is examine each, measure and if required trim to length. You might be surprised the variations in even the more expensive cases.
The old trick you describe works well but do it five times and measure each time for certainty…

I just run them all through the trimmer.
No real point measuring, in my opinion.

 

[timbrayford]

Treat new brass as needing resizing from fired,as others have said the dimensions within a batch can vary.