Many years ago, per some gun writer, the gold standard load in the Swift and 55 gr bullets was 38.5 gr of IMR 4064. I worked my way up to that and found he was correct. That’s my load to this day, over 35 years. If I was going to try something else, I’d give R15 and H4831sc a try. But...it ain’t broke...
On my second barrel. Same load.
