Rainier Bullets is located about 3 miles from my shop, so I have used them from the very early days when the company had another name. I use the 200 gr SWC .45 bullet with a fairly hot load and have had excellent results.
The only time you have to be careful is with the magnum loads. They have been known to shed the plating when pushed too fast.
In tests, I have pushed the .45 to 1,000 with good results. I prefer to keep the .44 mag at .44 special +P level maximum or less.
The new "double bumped" bullets look and work better than the older type. So well that I haven't made H&G 68's on my Master Caster in quite a few years.