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Hunting
Long Range Hunting & Shooting
8 twist 22” 300 Win Mag with 215 Berger Hybrids
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<blockquote data-quote="Okanogan" data-source="post: 1521950" data-attributes="member: 90397"><p>My 300 WM has a 25" barrel and a 1:9 twist and my best loads do 2840 fps with both RL26 and H1000. I have pushed the velocities a little higher in testing but the SD starting opening up so I opted a little slower for my go to loads. Nothings says your max loads will give either best group or best consistency in SDs which is something to keep in mind. I.e. you may not need to be singularly concerned with your fps objective vs packability in selecting your build as the reality of selecting a load might dictate velocity a little up or down anyway. (Granted longer is going to be faster)</p><p></p><p>I have a Thunderbeast Ultra 7 in 30 cal which is relegated to other platforms. My experience with it on my 308 GAP 10 was positive in terms of consistency and accuracy. I also saw slightly increased signs of pressure and a modest velocity boost when it was mounted. You may gain back a bit of what you lose with a shorter barrel with the suppressor, though not anywhere near what 7" of barrel would have gotten you. If I recall right, I saw 30-40 fps on the 308 which had a 20" barrel.</p><p></p><p>For some more objective input on barrel length vs velocity you might want to check out this article:</p><p><a href="https://rifleshooter.com/2013/12/300-winchester-magnum-how-does-barrel-length-change-velocity-a-16-300-win-mag/" target="_blank">https://rifleshooter.com/2013/12/300-winchester-magnum-how-does-barrel-length-change-velocity-a-16-300-win-mag/</a></p></blockquote><p></p>
[QUOTE="Okanogan, post: 1521950, member: 90397"] My 300 WM has a 25" barrel and a 1:9 twist and my best loads do 2840 fps with both RL26 and H1000. I have pushed the velocities a little higher in testing but the SD starting opening up so I opted a little slower for my go to loads. Nothings says your max loads will give either best group or best consistency in SDs which is something to keep in mind. I.e. you may not need to be singularly concerned with your fps objective vs packability in selecting your build as the reality of selecting a load might dictate velocity a little up or down anyway. (Granted longer is going to be faster) I have a Thunderbeast Ultra 7 in 30 cal which is relegated to other platforms. My experience with it on my 308 GAP 10 was positive in terms of consistency and accuracy. I also saw slightly increased signs of pressure and a modest velocity boost when it was mounted. You may gain back a bit of what you lose with a shorter barrel with the suppressor, though not anywhere near what 7" of barrel would have gotten you. If I recall right, I saw 30-40 fps on the 308 which had a 20" barrel. For some more objective input on barrel length vs velocity you might want to check out this article: [URL]https://rifleshooter.com/2013/12/300-winchester-magnum-how-does-barrel-length-change-velocity-a-16-300-win-mag/[/URL] [/QUOTE]
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8 twist 22” 300 Win Mag with 215 Berger Hybrids
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