H380 was the most accurate powder with these bullet weights.
Nosler figures show that 60.0 grains of H380 powder behind their 165-168 grain bullets gave a MV of 2940 fps, and a maximum charge of 64.0 grains of H380 gave a MV of 3087 fps. IMR 4064 proved to be the most accurate powder with bullets of this weight in the Nosler tests. A maximum load of 60.5 grains of the same powder produced a MV of 3242 fps. The fifth edition of the Nosler Reloading Guide shows that 56.5 grains of IMR 4064 behind their 150-155 grain bullets produced a MV of 3063 fps. The medium to slow burning rifle powders work best in the. So bullets from 150-180 grains are usually the best choice in the. 300 WSM case does not handle bullets heavier than 180 grain very efficiently. However, the very light 100-125 grain bullets make little sense in any. 300 WSM reloader, ranging from 100-250 grains. 30 caliber cartridges, there is a huge array of bullets available to the. 300 WSM statistics of interest to reloaders: bullet diameter. 300 Winchester Magnum taken in the same length barrel, and also to the figures for the. Those figures are nearly identical to the velocity of the. The 200 yard figures are 2524 fps and 2547 ft. of muzzle energy for the 180 grain bullet. Winchester claims a MV of 2970 fps with 3526 ft. The 200 yard figures are 2834 fps and 2676 ft. 300 WSM with a 24" test barrel claim a muzzle velocity of 3300 fps and ME of 3628 ft. With bullets in the 150-180 grain weight range, however, its performance is essentially identical to that of the established. It has slightly less powder capacity than the standard length.
300 WSM (Winchester Short Magnum) is the most popular and widely distributed of the modern crop of short magnum cartridges in terms of both factory loaded ammunition and rifles available.
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