I have just bought a S+W 625 and want to start reloading for it.

Does it matter what kind of dies to get as long as they are carbide? I use a dillon 550b.

Any will work, however the Dillon may work a bit better. I am using RCBS for 45 on my 550 and they work just fine. I use Lee for some other calibers and they have to be screwed in so far that it is difficult to get the locking rings on.

Over the years I've used Lymans, RCBS, Lee, newer RCBS, and Dillons. The Dillons work well on the Dillon presses. If you are shooting the .45s exclusively in a 625 then it really dosen't matter. I would stick to Dillon dies in the Dillon press, they work great, have a great guarantee and are easy to clean and change bullet types. I load five pistol calibers on my Dillon 650 and have no, none, complaints using Dillon dies.

I don't have a 550. If I did, I'd either use the Dillon dies (because they come apart easy for cleaning) or go with Lee (I like the 4 die set with the factory crimp die).

The guy that ran Lancer Ammo swears by Lee dies. Said he used them on both his commercial machines and the 1050s that he had.

Get Dillon dies if oyu want to be able to load most any brand of brass, especially thin stuff like Remington. It may not be true anymore, but for many years, only Dillon .45 ACP sizer dies were made in the correct dimensions (a slight taper), and if one tried to load Remington brass with anybody else's sizer die, correct neck tension could not be achieved.

I've loaded lots of .45 ACP for my Kimber 1911 on Lee dies. Never had problems; really like the factory crimp die- irons out all the final kinks and puts a good taper crimp on. No experience with other 45 dies, but 1 vote for Lee.

Being that you already have a Dillion 550, I would recommend going with Dillion dies. I have a set of .45acp&.45AR on my 550. They are well made and are guaranteed for a lifetime with the no bs people behind them. I think that I have used about every make of die on the market over the years and I can say that they all loaded ammunition that would do the job if I did mine. They all had strengths and a weakness or two but that was mostly a subjective like or dislike on my part. The smoothest and best finished dies I have found are the Reddings. RCBS with their lifetime warranty and good design would rate right there with the Redding; and Lyman & Hornady are right on their heels. Lee's load good ammunition but the fit and finish are a little rough, however they are the most economical of the bunch. My experience anyway.