The Remington Express 125 grain SJHP is an old equal to that hot Federal load. It's what I carry in my 4" GP100.
It averages 1451 fps on a 90 degree F day out out of my GP100 for 587 ft/lbs ME.
Hard kicking, and a lot of flash out of the 4" GP100.
You can sometimes find the less expensive UMC 125 grain SJHP at WalMart. Same bullet, but it has a dirtier burning powder than the Remington load, and is in a brass case instead of a nickled, but is loaded as hot.
I used to buy that Federal Classic load at WalMart years ago in boxes of 50 for around $20, but that dried up years ago also.
Now, hottest might not equal best, but I like the Remington Express 125 grain SJHP. I'd use the Federal equivalent if I could find it.