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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
I need to push a 180g 30cal over 4000fps what are my options
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<blockquote data-quote="LouBoyd" data-source="post: 406024" data-attributes="member: 9253"><p>You could have Pac-Nor make a 36" 50 BMG 0.510" groove barrel with a 10" twist (a standard option) which could shoot 30 caliber bullets in sabots with up to 300 grains bullet plus sabot weight at 4000+ fps at 90% of SAAMI pressure with decent barrel life. Loads of around 260 grains of VV N560 (depending on sabot design and seating depth) would do the job. I expect most jacketed lead 30 cal bullets would just blow up at 288000 rpm but copper alloy solids should survive. </p><p></p><p>I haven't tried a fast twist 50 BMG but it sounds like a fun project. I've shot 55 grain 224 bullets at over 4250 FPS in sabots from a 10" twist 300 Win Mag. With the larger bore barrel life is much improved. Look at how the US Army gets 5500 FPS from the 120mm cannon on the Abrams tank. The projectile is only 27mm, but are fin stabilized.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 406024, member: 9253"] You could have Pac-Nor make a 36" 50 BMG 0.510" groove barrel with a 10" twist (a standard option) which could shoot 30 caliber bullets in sabots with up to 300 grains bullet plus sabot weight at 4000+ fps at 90% of SAAMI pressure with decent barrel life. Loads of around 260 grains of VV N560 (depending on sabot design and seating depth) would do the job. I expect most jacketed lead 30 cal bullets would just blow up at 288000 rpm but copper alloy solids should survive. I haven't tried a fast twist 50 BMG but it sounds like a fun project. I've shot 55 grain 224 bullets at over 4250 FPS in sabots from a 10" twist 300 Win Mag. With the larger bore barrel life is much improved. Look at how the US Army gets 5500 FPS from the 120mm cannon on the Abrams tank. The projectile is only 27mm, but are fin stabilized. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
I need to push a 180g 30cal over 4000fps what are my options
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