[skidooman603]

I've been a range rat for so long I can't remember when I've last bought NEW brass for anything. Should I resize new RP .223 brass before loading? :confused:

[Ben Shepherd]

Yes.

1. Verifies a flash hole.
2. Takes out and dings in case mouths.
3. Verifies correct case dimensions, head diameter, etc.

ALWAYS size and check for length EVERY piece of new brass before loading.

[Grumulkin]

NO.

1. Do verify that the flash holes are centered.
2. If loading boat tailed bullets, they'll take the dings out of case mouths when seated. Chamfering makes the bullets go in a little easier but with boat tailed bullets isn't entirely necessary. If seating flat based bullets and the case mouth is too out of round, you may have to break down and size it.
3. The factory verified correct case dimensions; why do you need to?

I RARELY size or check new brass before loading but, if you wish to complicate your life, go ahead and do so.

[243winxb]

Check to make sure the new brass will chamber in your gun by trying 5 cases from the same lot. If OK, make the case mouth round by bumping the mouth with the expander button if needed. Chamfer for flat base bullets. Not need for boatails bullets. Then load.

[NCsmitty]

I'm with Ben Shepherd on this. I run all my new brass through the FL die after inside and outside chamfer of the neck. I want all my brass the same.

You do as you want, but IMO, you do not take shortcuts for making accurate ammo.

NCsmitty

[FM12]

YES, especially if for an autoloader.

[skidooman603]

Thanks to all for the input! Was going to just do it anyway but hate to over work brass at the cost of new. Forgot how expensive the new stuff is. Not too much range brass to be had in below zero weather here in the frozen tundra known as michigan. Love to go to the range and watch these rich boys leave behind all their 7mm mag and .375 brass. All I see are $$$$$ signs. You all have a great day.