I love my SR 45...now...
I bought the first one to appear at my LGS in February. The S/N is in the low 4000's.
After a quick inspection and basic cleaning, I put about 50 rounds through it with several FTF jams. These were a mix of my reloads and factory 'ball' ammo.
I noticed that the firing pin would sometimes be exposed (sticking out) when the round was being loaded. This caused the case to catch as it rode up the bolt face and jam with the cartridge partially in the chamber. I also had a hard time loading the 10th round in the mags.
A call to Ruger support and had a shipping label in minutes. They had the gun about 10 days and it came back with repaired mags and some work in the striker area, per the cryptic notes. The next range session was much better but still couple FTF's.
What I finally did was to load both mags with 10 rounds and leave them sit for a couple weeks. They now load 10 with no issues and chamber the first round fine. I then loaded up 100 230 grain RN's with a slightly +P charge.
One more strip and clean, including the striker and channel. Banged off the 100 full power loads with no issues.
I have since shot 100's of lower power target loads and different bullet profiles with no problems.
My conclusions:
Ruger makes a great gun, but has the occasional miss, perhaps to the current high volume production.
Their product support is great.
Breaking in the mag springs by leaving them loaded and running some full power loads probably helps finish the gun's break in.
I love the way it shoots and my confidence is growing as it continues to be trouble free.
One man's experience..
edited for typos..