Several good tips here so far, the SWFA SS 10X, keep your rifle stock until you can develop custom hand loads, practice, practice and practice more, use only the equipment on the range that you are going to use on the field, most any bipod will do as long as it is keeps your rifle from moving around, a scope level to keep the cross hairs level. I use a cheap bipod and a small rear bag, you can make your own, a sock with sand will do. Select a heavy bullet for your caliber 190 to 210 grains for the 300 WSM will work my preference is the Berger VLD hunting their tolerance is very tight, use the Nosler reloading data available online they list the powder they found most accurate for a particular bullet weight and use the OCW, Optimal Charge Weight, method to develop your loads the info is available online. I have found that Nosler Custom brass is the best way to go it is expensive but a lot cheaper that buying cheap brass and having to buy all the tools to get it uniform, the Nosler is good to go right out of the box. Fire form your brass before starting load development and don't use it in another rifle. Fire forming "fits" the brass to a specific rifles chamber increasing its accuracy potential, neck size only after fire forming. I've taken several factory stock rifles from 1"+ groups to ¼" groups with just load development. Most recently a Browning X-bolt 300 WSM with Berger 175 gr VLD hunting, Nosler brass, Federal GM215M primers and RL-22 at 68.7 grains, your barrel my need more or less powder for optimal accuracy but this should get you started. Yeah I went a little light with the bullet in this load but it was all I could get on short notice, took my Elk in one shot at 475 yds.