Dillon's rifle dies are a three die set whereas most major brands use two dies. Dillon's dies have a bullet seating die and a seperate taper crimp die. This is combined with the other brands. IF you wish to crimp, it would require a die change and a seperate pass thru a single stage press. The extra step amounts to zero extra work on a progressive. If you don't care to crimp or don't mind the extra work, it won't matter. BTW: IMHO crimping isn't necessary except for large caliber boomers and tube feed lever guns. Other than that they are great dies. The resize die has a built in stuck case remover which is really great to have if you stick a case on a progressive press.
30 minutes later I decided to edit in the following:
Dillon has a limited offering of calibers for their in house dies. What they don't offer in house they offer with Redding Dies which are top drawer too IMHO. I checked and Dillon does offer 30/30 which is the only caliber that I feel crimping is necessary.
On Dillon's web site they offer this description for their size die:
"Dillon Three-Die Rifle Die Sets include a sizing/ depriming die, a bullet seating die and a taper crimp die. Dillon Two-Die Rifle Die Sets include a sizing/depriming die and a seat/crimp die.
Sizing/Depriming Die
The sizing/depriming die is full-length, to minimum tolerances, sizing cases down to function in semi- and full-automatic firearms. We strongly suggest that a headspace case gage be used to correctly adjust the size die.
For high volume users, such as commercial reloaders, law enforcement agencies, and high power or service rifle competitors, we also offer .223 and .308 die sets with a full-length carbide sizing die. Lubrication is still required, but the increased scratch resistance and die longevity of carbide are of great benefit to these groups of users.
The depriming assembly includes a carbide expander ball for "squeak-free," effortless neck expansion. This expander ball is located in the middle of the depriming stem to take advantage of superior initial leverage for easier extraction.
In the event of a stuck case, the design of the depriming assembly allows it to function as a stuck case remover."