As most members would know I have been touting factory Win 150 or 175 Sp`s forever,yes I have used Hydros/Partitions/round nose and whatever else that I cant remember. Gee they work extremely well in 7mmrm format.
I dont know why they dont work as well (presuming its the same projectile?) in the `57.Perhaps its the lesser power of the `57 I suspect.