You're thinking of the 45 Super. The Rowland has a longer brass case so it wouldn't fit in a standard .45 Auto chamber. I think it would be like shooting hot .45 Long Colt loads in a 625. Not recommended for shooting a lot, but OK for woods carry. There is someone on here that had his cylinder bored out for it. Clark used to ream 625 cylinders for this conversion. I would stick with the .45 Super and not risk blowing the cylinder. Rowland is 40,000 psi.
I asked this same question when I was thinking of converting my 325PD to Rowland. I sold my 325Pd and bought a Night Guard 325 with the ss cylinder to replace it and am sticking to .45 super.