I'm not using 180gr in my 300 win mag, but i'm having exellant results with 200 gr Accubonds. 72.4gr Reloader22, and getting .75 groups or better, and 2975 fps .010 of the lands. This will be my hunting load this season!

testing was at 3000' elevation 70deg

Here is a load I liked for a Ruger No. 1H that I had about 15 years ago: 180 gr. Nosler partition, Rem. brass, 77.0 grs. of H-4831, CCI-250 primer. This was a maximum load so work up to it. I did not have a chronograph back then. Accuracy went around 1" for 5-shot groups, and really got the attention of whitetails and feral hogs in the Texas hill country.