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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BARREL TWIST RATES
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<blockquote data-quote="Chrismadrid" data-source="post: 118942" data-attributes="member: 4416"><p>OK - This is something real new to me. But here's my problem. </p><p></p><p>1) Subsonic</p><p>2) Small calibre</p><p>3) Pure lead rounds</p><p></p><p>No hiding - it's an airgun - but a severly overpowered one. It's an itch I just have to scratch. </p><p></p><p>Her's my dilema - To keep it subsonic I have to use Heavy rounds. And to keep tehm stable I need to use a hollow base it seems - the result is LONG rounds (3 calibres and rising) and I'm getting concerned I may need to alter twist rates.</p><p></p><p>Standard airgun barrels from Walther are 450mm twist - the option is to use a .17HMR barrel put the jump is HUGE. from 1:16approx to 1:9</p><p></p><p>Found this "Twist = 150 X D2/L" But seems that speed is a factor and I'm aiming for around 300m/s. The Greenhill is apparently for twice that.</p><p></p><p>HELP! - If you can.</p></blockquote><p></p>
[QUOTE="Chrismadrid, post: 118942, member: 4416"] OK - This is something real new to me. But here's my problem. 1) Subsonic 2) Small calibre 3) Pure lead rounds No hiding - it's an airgun - but a severly overpowered one. It's an itch I just have to scratch. Her's my dilema - To keep it subsonic I have to use Heavy rounds. And to keep tehm stable I need to use a hollow base it seems - the result is LONG rounds (3 calibres and rising) and I'm getting concerned I may need to alter twist rates. Standard airgun barrels from Walther are 450mm twist - the option is to use a .17HMR barrel put the jump is HUGE. from 1:16approx to 1:9 Found this "Twist = 150 X D2/L" But seems that speed is a factor and I'm aiming for around 300m/s. The Greenhill is apparently for twice that. HELP! - If you can. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BARREL TWIST RATES
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