Lefty7mmstw
Well-Known Member
The 300 h&h and 300 wsm have the same useable case capacity. Handloader mag did a write-up on the two years ago( by Sisk??) with a barrel chambered in 300 h&h then cut down and re-chambered in 300 wsm leaving the throat the same, and both were essentially the same pressure and accuracy wise. Don't cut on the 300 h&h; you have a re-designed one. They are both good for their purpose, but they aren't a 300 win long or 300 rum.Could be because many of the larger cases were overhyped from the start. Factors like barrel length, actual case capacity with a bullet seated play into it. It's not too difficult to find loading manuals where looking at only top velocity the 300 H&H may come out ahead. Mild factory loadings can make the difference seem larger than it is. When loaded to similar pressures it takes a fair amount of capacity to equate into a meaningful change.
Don't get me wrong I like them all, but I do use my 300 win in a standard length action, it it'll still do 200 fps above factories for either of the win cals. You have to cheat the action length for extra boiler room on the 300 wsm; it's apples and oranges.