Regular dies should work fine provided you are virgin brass or brass that has only been fired in your rifle. If you are using milsurp or other brass that was fired in someone else's rifle, then, at least for the initial sizing, a small base die is a safer bet.
All that being said, I have found Forster dies to size the case body a little smaller than most and have loaded literally thousands of milsurp brass without using a small base die, instead using Forster FL dies. They have all functioned flawlessly in my AR.
John
Lee Ultimate 223 Remington Full Length Sizing, Neck Sizing, Bullet
Choose the Lee Ultimate Die Set for maximum versatility. The set features a full length-resizing die to return brass to factory new dimensions, perfect...www.midwayusa.com
Lee has superior decapping pin design over replaceable RCBS pins. Just buy several because you can bend them.
I used to trim and chamfer all 223 to 1.750 They actually work fine out to 1.770 or so. Since I use a Dillion 550 the crimper stage is a good thing to be consistent on neck tension.
I use Rem BR primer for precision AR shooting. AR-comp and 2000-mr powder. Leverrevolution, 748, CFE 223, H414 are okay. .223 IMO is kind of limited to 75 and less grain bullets because of the 2.26 length.
I only use match 11° target crowned SS barrels of 20 and 24 inches. I'm a piston gun AR guy
Size them first and then wet tumble clean to be lube free for reloading. I sort everything and only use Lake City for paper days. It is possible to shoot sub dime sized 200 yard groups in a AR platform.
Thanks for the help.
I have about 90 pics if once fired fireformed Hornady brass from factory rounds, these were fired on my rifle. I used a few of them yesterday to prep some loads. I'll be getting some Nosler brass soon though.
I used full size dies and they chambered with no issues. I'll see how they work at the range this weekend.
This is not a competition AR. It's a Sig M400 with a stock 16" 1:7 barrel that I got a few years ago and has about 800 rounds fired through it. I am changing the trigger before hitting the range this weekend, I got a Triggertech adaptable 2.5 to 5.0 lbs so that should help in accuracy.
Like with any other rifle I do want sub half MOA accuracy so we'll see how it goes.
Thank again everyone for the help, I appreciate it
Luis