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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
243 1:10 Heaviest Bullet?
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<blockquote data-quote="Bullet bumper" data-source="post: 1323692" data-attributes="member: 17844"><p>It is not the bullet weight that determines barrel twist it's the bullet length . </p><p>So a long boat tail lighter bullet will need more twist rate than a shorter heavier one . Weight is only used as a rough rule of thumb guide and was more suitable back before boat tail , long ogive bullets were around . </p><p>I have been using the .243 for about 45 years now so I have some experience with this cartridge . I remember when it first appeared on the market .</p><p>There is no real advantage to using a bullet heavier than about 87 to 90 grains in a 243 at range . The loss of velocity and powder room using the heavier and longer bullets just losses kinetic energy and at longer range has less hitting power than the lighter bullet going faster to start with . If you do want a 100 grain bullet in .243 keep it for close range and or thick bush use in a 1 in 10 twist barrel then choose a flat base bullet . This shortens the bullet compared to a boat tail of same weight and at short range a boat tail is of little to no ballistic advantage anyway . </p><p>The longer bearing area of the flat base also gives better gas seal , better rifling grip and resists in bore yaw better when being driven hard .</p><p>Some very light for the caliber bullets can require more twist rate even though they may be shorter than another bullet that is fine in said twist rate. The reason is that inside the bullet the core may be made very short and the ogive is basically hollow inside . This moves the center of gravity way back and creates an unstable design example is Barnes varmint grenade . Extra twist rate compensates for that bad design work.</p></blockquote><p></p>
[QUOTE="Bullet bumper, post: 1323692, member: 17844"] It is not the bullet weight that determines barrel twist it's the bullet length . So a long boat tail lighter bullet will need more twist rate than a shorter heavier one . Weight is only used as a rough rule of thumb guide and was more suitable back before boat tail , long ogive bullets were around . I have been using the .243 for about 45 years now so I have some experience with this cartridge . I remember when it first appeared on the market . There is no real advantage to using a bullet heavier than about 87 to 90 grains in a 243 at range . The loss of velocity and powder room using the heavier and longer bullets just losses kinetic energy and at longer range has less hitting power than the lighter bullet going faster to start with . If you do want a 100 grain bullet in .243 keep it for close range and or thick bush use in a 1 in 10 twist barrel then choose a flat base bullet . This shortens the bullet compared to a boat tail of same weight and at short range a boat tail is of little to no ballistic advantage anyway . The longer bearing area of the flat base also gives better gas seal , better rifling grip and resists in bore yaw better when being driven hard . Some very light for the caliber bullets can require more twist rate even though they may be shorter than another bullet that is fine in said twist rate. The reason is that inside the bullet the core may be made very short and the ogive is basically hollow inside . This moves the center of gravity way back and creates an unstable design example is Barnes varmint grenade . Extra twist rate compensates for that bad design work. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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243 1:10 Heaviest Bullet?
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