I also use Lee (carbide) dies for pistol, and have loaded thousands of rounds with zero issues and it's nice they come with the shell holder. For the money I am satisfied with Lee pistol dies. All the rifle dies I have are RCBS and again have no complaints. I'm no precision loader, but with...
Two long range loads have worked very well for me with a 18" 1/8 twist barrel, 556 chamber.
77 gr SMK
23.3 grs of IMR 8208 XBR or 24.0 gr of Ramshot TAC
Wolf 223 primers
LC OFB Brass
2.255 OAL
1.750 Trim
Light Lee Factory Crimp, approximate half a turn.
I used a $159 (on sale from MidwayUSA) 18" DPMS 1:8 MK12 barrel, could not be happier for the money spent.
Attached target, 3 shot group, 100 yds, 55gr FMJ.
Equally impressive at 300 yds and out to 600 with 77 gr SMK over 23.3 grs of IMR 8208 XBR.