Data from the Olin Corporation's Winchester Division Ballistic Services shows a load of 68.0 grains of WC760 powder with WLR primers, and. Initial testing suggests that factory ballistics can be achieved with several moderately slow-burning powders, including W-W 760 and IMR-4350. 260 Remington, 6.5 Creedmoor, 6.5×55 SE, 7 mm Weatherby Magnum. 300 WSM is just starting to be published. I'm by no means a reloading expert but for as much as I shoot this rifle it has worked well for me. I've shot sub 1.5 inch groups at 400 yds with this recipe. I pulled the striker assembly from the rifle,and chambered the fired cases from each load cases fired with the RL15 would drop right in,but those fired with the Fusions required considerable force to chamber. Vihtavuori N160 rifle powder for large & magnum caliber hunting Vihtavuori’s N160 rifle powder is especially suitable for large and magnum calibers (especially belted Magnums) starting from 30-06 with heavier bullets. I load my 300 sako a7 300 wsm with 64 grains of hybrid 100 V powder, Winchester primers, in reused federal brass topped with 180 grn accubonds. I also measured Federal 165 Fusions,and got a high of 3129,low of 3080 or so.īoth loads shot really well, provided I let the barrel cool after no more than two the rifle shoots very tight 3 in a row opens the group. Been a few years since I messed with a 300WSM,but chronographed a couple of loads in a SC M70 EW today and checked my old notes on the cartridge.īobcat's load listed above peeked my interest because I was curious about the quicker powders in the cartridge so I loaded up with 58.8 of RL15 and 165 Sierra SBT load was very accurate from my rifle's 24" barrel and gave about 2980 average over 6 shots.Temps here today were 33-34 degrees.
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