I usually try to stay out of these WSM, WSSM postulations, but there is an interesting test comparison in the February Handloader magazine. The article is written by John Barnsness, with the actual testing done by Charlie Sisk. The idea was to compare Accuracy/Velocity, etc in two cartridges of almost identical capacities, but with radically different shapes. Guess which ones? The 300 H&H and the 300 WSM. The same barrel was used for both tests, with the initial chambering being the 300 H&H, and after that the barrel was cut off in the back a bit, leaving the throat area as intact as possible, and running a 300 WSM reamer in to cut the new chamber. The tests were not run too long, so as not to induce too much throat erosion, and thus skew the results. Three different powders were used with two different bullet weights (150 & 180 grain) When the dust settled, there was NO difference in the performance of the two. In fact the accuracy average leaned slightly to the 300 H&H!! (.58" vs .76") Velocity average was practically identical (3076 vs 3082) Bottom line
IN THIS INSTANCE......Case shape and length mean diddley squat in the real world of hunters and casual shooters. While I'm all for innovation and R & D, the hype is just that, hype! If you prefer a short action that delivers the same performance as the long one, then the WSM is for you, but more efficient? A lot more accuracy? You decide. Regards, Eagleye. BR, you can shoot now, my bulletproof armor is on..