If you go the Redhawk route, be advised that it is now not uncommon at all for Ruger to ship guns with undersized cylinder throats. I wouldn't bother telling you this, but the last 3 .45 Colt Rugers I've purchased have all had this malady. I've found it next to impossible to get good accuracy when the cylinder swages your .451 bullets down to .449 or so.
Last time I checked it was getting 3"-4" groups at 25 yards, iron sights or scoped.
Hopefully you can find someone with a Brownells chamber reamer who'll fix it for you for $20. If not, you're stuck buying $100 worth of tools to fix it yourself. You could try sending it back to Ruger, but some have said they had no success doing this.
I solved the problem with my Redhawk by saying the hell with it and putting it up for sale in the hopes of buying an older .44 mag. or .45 Colt Smith and Wesson. Extreme? Yes. But personally, I don't feel like it ought to be my job to fix what they screwed up, since I gave nearly $500 for my gun. I will no longer be buying any Rugers of any kind until the myriad QC issues are dealt with. Judging by the last 5 Ruger handguns I've purchased since 2001, I don't think I'll be missing much.