Be aware, you may well have problems with the Lee Round Nose Tumble Lube bullets.
The problem is that the ogive nose of the bullet terminates in a step/shoulder where the lube grooves start. This shoulder is about where the brass case mouth ends up when the bullet is seated.
The end results is that you end up with a very significant step, about .027", as a result of the thickness of the brass and the depth of that step/shoulder on the bullet.
When your gun extracts a spent cartridge, the case rim will snag on that step. 3 things will happen, only one of them good:
1) The case will jump the step, and all is well.
2) The case will gouge the case mouth of the top round in the magazine, and jam.
3) The case will jump the step, but expend so much energy it will stall on top of the top round in the magazine, also resulting in a jam.
You can see my write up on this problem here:
http://www.forth-armoury.com/temp/bullets/problems/problems.htm
http://www.forth-armoury.com/temp/bullets/problems/sizes.htm
Lee's recommended "solution" to my problem was to over-crimp the case mouth. However, the .45 ACP is supposed to headspace on the case mouth so if you over-crimp it it may fall too deeply into the barrel. Lee said this was not a problem since many .45s actually headspace on the extractor. This may be, but it is not the way it is supposed to be.
My solution to the problem was to switch to the Lee Truncated Cone tumble lube bullet. The Truncated Cone bullet has the cone of the bullet nose go straight to the outer diameter of the bullet with no step/shoulder, so the only step is the thickness of the brass. I have had no problems with this bullet.
The gun is a Ruger P90.
Steve