I have not used a Dillon press either. I am still using a RCBS single stage press that I have had for a long time. Since you are just starting out, I would suggest getting a good quality single stage press. Once you understand how reloading works, the ins and outs of adjusting dies and load development, you could get a Dillon to speed up the reloading process. You could still use your single stage press for load development for other cartridges or experimenting with your 25-20 after getting the Dillon. Once I have the cases prepped and primed, I can load 75 -100 rounds/hour in my single stage press. Of course a Dillon will spew them out much faster doing the priming along the way. As far as the dies are concerned I have both RCBS and Lee dies. I can not tell the difference in quality of the reloads when finished. The RCBS dies finished/look better than the Lee dies, but the end result is the same. There are 2 kinds of Lee FCD. There is the type that squeezes down the neck as Graybeard has described and then there is a carbide roll crimp type too. The squeeze type are used on bottle neck cartridges and the carbide roll crimp on straight walled cases. I just checked, and the 25-20 is a squeeze type. I have not had a lot of experience with the Lee FCDs, I have just recently got one for the 22 Hornet. I have found that the when using jacketed bullets with the thin neck of the 22 Hornet, it straightens out the neck like it was new again. you can see slight marks, but the case mouths seem to be perfectly round once I have run them through a neck sizer or full length sizer. I do not know how they would work on thicker necks. You can adjust the amount of crimp you get too. A slight one or heavy, depending on what you want and die adjustment. Of course since you have a lever action you do want some kind of crimp. I do believe the Redding dies have a built in crimp in the seater die. With jacketed bullets I would just put a chamfer on the inside of the case neck and not worry about belling the mouth. If you were loading up cast bullets, you want to bell the mouth slightly so you do not shave lead when seating the bullet. You said you were going to get a loading manual. If it is from one of the big bullet making houses, it will give you reloading tips and how to set your dies. Good Luck and good shooting.