Federal is the easier to ignite primer. In fact, Dillon suggests they not be used in their equipment as a result of their 'soft' nature. I have had zero problems reloading with Federal primers in the only reloading press I have ever used, a Dillon 550B.
BigG,
Re your .45 Colt DA revolver comments... I have not had the empties slipping under the ejector problem with either my '96 or '01 version of the .45 Colt S&W 625 Mountain Gun. Admittedly, I do not 'Hollywood' rap the extractor rod for ejection, either. Still, with my Redhawk, and especially if I do it slowly or sporadically, I have had a few, albeit infrequent, such 'catches'. As to ultimate 'power', make no mistake, a large charge and bullet combo can easily outdo a .44 Magnum - and at a lessor recoil. That, of course, requires a T/C or Ruger, etc, SA for the launch platform. The .45 Colt does typically have other problems.
First, the cylinder exit bores are often improperly sized - and, in Ruger's case, inconsistent. Thankfully, the Rugers are generally undersized, which can be reamed to the proper size. Some earlier S&W's actually were oversized, not a fixable fault, except with a new cylinder. Second is the over-sized chambers employed by Ruger and S&W - actually the old blackpowder sized SAAMI specification. With properly sized cartridges, they actually are loose when inserted. At lower 'cowboy' levels, the case mouth often won't obturate to the point where it gas seals, resulting in the well known 'smoke trail' generally on the 'top' (fired position) of the fired case. This lessens with increasing pressure loads. Since the new .45 Colt S&W 625's are built on the .45 ACP 625 frame, one must assume that they are also capable of at least 21kpsi, instead of the SAAMI .45 Colt 14 kpsi. That level should lessen or remove the 'smoke trail'.
With all of it's problems, I still really like the old cartridge. Sure, you can get decent levels with a .45 Auto Rim, too... but that big old cartridge is neat. I do admit an uncanny admiration for it's historical predecessor, the .44 Russian, but that's another chapter...
Stainz