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Rifles, Reloading, Optics, Equipment
Reloading
300 win mag load
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<blockquote data-quote="Bart B" data-source="post: 1122251" data-attributes="member: 5302"><p>I suggest full length sizing your fired cases. New cases are full length sized. Few, if any, long range match winners and record setters shot good scores with neck sized cases when that 300 was popular in such events. Several such people used only new cases.</p><p></p><p>A 1:12 twist was also popular for 190 to 210 grain bullets. My three 30-338 barrels had it and shot those bullets about 70 fps slower than the 300 Win 2/3 MOA at a thousand. Your 1:11 twist is good for 220-gr. bullets, too. But only with new or full length sized cases.</p><p></p><p>Sierra tests all 30 caliber bullets 190 grains and heavier in full length sized cases using Redding bushing dies. I think a 1:11 twist is used. Match bullets have to shoot under 1" at 200 yards.</p><p></p><p>I suspect your barrel's groove diameter is oversize with the low velocity factory loads produce. I'm surprized it shot that good with factory ammo.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1122251, member: 5302"] I suggest full length sizing your fired cases. New cases are full length sized. Few, if any, long range match winners and record setters shot good scores with neck sized cases when that 300 was popular in such events. Several such people used only new cases. A 1:12 twist was also popular for 190 to 210 grain bullets. My three 30-338 barrels had it and shot those bullets about 70 fps slower than the 300 Win 2/3 MOA at a thousand. Your 1:11 twist is good for 220-gr. bullets, too. But only with new or full length sized cases. Sierra tests all 30 caliber bullets 190 grains and heavier in full length sized cases using Redding bushing dies. I think a 1:11 twist is used. Match bullets have to shoot under 1" at 200 yards. I suspect your barrel's groove diameter is oversize with the low velocity factory loads produce. I'm surprized it shot that good with factory ammo. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 win mag load
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