I have lee collet dies in a bunch of calibers...even 50BMG. But I hardly use them these days. When your brass gets fired a few times in your bolt action, ya gotta bump the shoulder back, anyway.
Plus as the brass gets different hardness in the necks after firing...so your neck spring back gets to varying quite a bit where the bullet can be pulled out of the case with your fingers... in sone cases. Same on bushing dies... You need to anneal, but more often on the Lee collet dies, consistent neck hardness seems to show up more easily in the collet die. When you get them take them apart and deburr and polish & lube them ... follow instructions on set up, or you crush shoulders. And you can only polish the mandrel (anvil?) down so far. I just buy FL bushing dies these days, machine all the bushings in a lathe, so they are free, and I get the exact size for the brass, in the press...plus I set the shoulder back slightly...so they all chamber nicely. Just got done loading some 6 dasher...in a FL bushing die...and some 8.6 Blackout in a standard FL sizing die and some 358 Win in standard FL sizing die. I have Lee collet dies in 222, 17 rem, 223, 25-06, 308, 6 5 Creedmoor, 338 Win mag, 50BMG...that I can think of... but its been years since I've used them...Except ..I have 2 for 50BMG...no lube on the 50BMG if fired in your bolt gun saves time ... great for sub 50s, with Trailboss or Redot, and with fun tips...make flash & alot of noise on impact...even in plywood backer...and accuracy is great...shoot the eye out of a hog at 50 yards with a sub 650 gr 50BMG. That's my experience with collet dies...they have a place ... but for me it's limited.