I have a MK V stainless with a McMillan stick i Bought a few years ago that is not producing the groups i would like. It is a used rifle, with a stock barrel and i think its time for an upgrade. My Question is which barrels are the best and which ones can i expect less out of? My McMillan custom 300WSM has a Shilen and it continues to impress me, I like the idea of PAC-Nor because they are more local to me but they also seem to be on the cheaper end of the scale and i want to make sure that this shouldn't be a red flag. My second question is the fatory barrel length is 26", should i stay with 26" or has anyone had any more/ less success with a a different length? Side Question, can i use H1000 to reload 300 wsm? Since powder is so scarce i cant find RL17 or 4350 or any other powder for that matter, anywhere.