Keep in mind folks that the MAX for H-110 used to be 20.0gr with the 125gr and 15.0 with the 158gr bullets
Again, what your seeing is Lot-to-Lot variation in that powder!!
Win296 is H110,(I've seen the 40lb cannisters with both labels on them-made by Primex in St.Marks plant) - but through the years (I've been using it in Hornets, .30 Carbine, .357's, .41's, and .44's for ~30years) and the latest batch is a little slower and more forgiving than others have been.
ENJOY IT WHILE IT LAST'S !!!!
But you small frame shooters (J,K,O, newer small frame colts, ect.) will be crying the BLUE'S about those "FIRE-BALL" loads "loosening" up your !@##%%^^ weak "sorry' guns in a couple of years. (Nothing wrong with the guns, just not up to long term use with THOSE loads)
That heavy load of H110 and a 125gr bullet ARE GREAT LOADS. I've shot many of them through K and L frame guns, at 21.0gr for around 1,450fps from a 4" bbl !!!!!
But they are THROAT ERODERS if ever there were any!!!
Shoot them if you like, I DO !!!
JUST BEWARE !
BTW: GaARM's "georgia deer stopper" load used to use the Sierra 158JHP and 16.5gr of H110, fwiw, and depending on the barrel/gun they were fired through, attain the claimed 1,500fps m.v. My 4" m-686 would get 1,525+/-, but my 6" 686 would only get 1,470fps+/- with same box 6-shot average. Go Figure !!!!! (4" was more accurate than 6" too- much tighter gun OTB)
And yes, they cratered primers too!!!
About like the Winchester 125grHP factory loads I was issued.
Younger generations' finding out about why some of us weren't real wild about having to turn in our .357 revolvers in the switch to the "spray and pray" 'Tupperware-hardware".