New Brass.

I don't go full length, but I do re-size the necks usually. The brass tends to get a little banged up during shipping are often the necks aren't round.
 
"...essential that you FL size new brass?..." Yep. New brass needs to be FL resized, checked for length, trimmed as required and chamfered and deburred.
 
I neck size and then prep, never had an issue

Same here. No problems. I do trim or at least measure length every time I prep the brass to load though. Usually have to trim the new brass after the first firing. I've never had a piece of neck sized new brass that didn't chamber.
Neck sizing the new brass typically leaves it at or slightly below trim-to length. YMMV
 
"...essential that you FL size new brass?..." Yep. New brass needs to be FL resized, checked for length, trimmed as required and chamfered and deburred.

Not a chance they need to be FL resized. I have been loading for 45 years, and have never FL sized any new brass.....and never an issue. However, as has been noted by another poster, neck sizing to be sure the necks are concentric, then chamfering the inside of the neck, are important steps in prepping new brass. It is extremely rare to find new brass that is overlength, but still worth checking to be sure none are too long. I always trim after the first firing, since the length will change the first time you fire them, and occasionally they will actually be shorter after firing once. Regards, Eagleye.
 
Not a chance they need to be FL resized. I have been loading for 45 years, and have never FL sized any new brass.....and never an issue. However, as has been noted by another poster, neck sizing to be sure the necks are concentric, then chamfering the inside of the neck, are important steps in prepping new brass. It is extremely rare to find new brass that is overlength, but still worth checking to be sure none are too long. I always trim after the first firing, since the length will change the first time you fire them, and occasionally they will actually be shorter after firing once. Regards, Eagleye.

Agreed. In a perfect world, they should be good to go. Since we don't live in a perfect world, partial neck sizing just ahead of the shoulder should catch any case that may have been distorted during packaging and shipping.
 
As already stated, not essential. You can do it if you want, and if it makes you feel better, but it is unlikely to affect anything, from accuracy to case life.
I normally just reload and shoot my new brass. If the neck is dented from handling I will run it across a sizer die to even it out.
I worry about trimming to length and chamfering after the first firing.
 
The last bag of Remington brass I opened had case lengths varying up to 24 thou.I size,trim and champher everything,new or not. Mur
 
Usually new brass is so small that the body won't touch the full length die anyway. You can run them through a full length die without lube without sticking. Once I discovered that, I routinely run regular brass through just to round out the necks. Lapua, Norma and Nosler brass just get loaded without a second glance.
 
I did a lot of shooting, competetive and hunting, very often using ammunition reloaded by a friend, before I loaded any myself. Finally, in 1964 I got full into reloading. Bought some new 30-06 brass, seated a primer in it, charged it up with Norma powder and seated either a Norma or a Dominion bullet. It worked great and since that time I have never sized any new brass, of any calibre, before I reloaded it. For a lot of years we always got new brass in boxes of twenty, so they were protected and came in perfect condition. Minor discrepancies in the necks of those that come in bags, has always for me, taken a jacketed bullet and the finished product looks perfect. And shoots that way, also.
The only exception to this is when loading something like 45-70 or 44 magnum with cast bullets. In that case, of course the neck has to be flared a bit to take the bullet.
 
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