Six years ago, a friend and I each ordered a 5.5" .45 RH from our local pusher. Within days of it's purchase, mine was headed back to NH for a myriad of QC issues - my friend's left days later. Mine was back within a month with a bunch of even newer parts - including a cylinder - his was replaced entirely as the original's frame was warped. He traded his within months - I sold mine after finding another 625MG in .45 Colt some two years later.
Mine had a 'trigger job' from Ruger - for my troubles. Still, a slow trigger pull would result in odd misfires with my Federal-primed homebrews. Gravity enhanced ejection was required, else that wobbly ejector would skip over the .45 Colt's dimunitive rim - jamming the revolver and requiring three hands to clear. My wife liked the smooth wood grips - and it became her bedside revolver, replacing a 2" 10. She finally missed it last spring - it had been gone for a couple of years! I put slick wood on the 2" 10 - she's happy - again - and I feel better. The odd ftf's and aggravating ejection jams didn't instill confidence. When it couldn't match the accuracy of my original 625MG in .45 Colt - and I had a lead on another such MG, it's sale was assured.
I have heard that the newer 4" .45 RHs have more dependable ignition and ejection - my 5.5" certainly had neither. The early production 7.5" .454 Casull SRH I had for years was by far the superior .45 Colt DA, although care did have to be excercised in their ejection, too. Lighter springs helped the SRH in .45 Colt - but yielded odd ftfs in .454 Casull use - the SRH's lockwork, the same as the GP-100, being superior to the RH's. My detuned .454 Casull loads - glorified .45 Colts - were by far the most 'fun'. My SRH is the only Ruger I miss. A 4" .454 SRH would still get my attention.
I wish you well - and to have the best of luck - with your .45 RHs. Mine was the beginning of the end for my Ruger ownership.
Stainz