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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
max effective barrel length for .243?
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<blockquote data-quote="CBS" data-source="post: 767218" data-attributes="member: 11718"><p>thanks for the responses guys. i'm feeling more comfortable about having this coversation on this forum considering the quality of the responses thus far. this barrel is MTU contour. not really what i'd prefer for this rifle but the barrel channel in the stock was already widened by the previous owner for a similar sized barrel (1-14 twist).</p><p> </p><p>i'd like to get a little more specific about your experiences with the .243. while longer barrels produce more velocity and everyone likes to use the 50fps/inch rule of thumb that i think is very vague and rarely true. i've seen experiments where guys cut an inch at a time off of a .223 to test velocity loss per inch and i was surprised at the relatively small amount of velocity loss per inch. (if i remember right the largest velocity loss per inch was 33fps.) i'd like some estimate from some of you as to how much velocity is actually given up by cutting a .243 barrel down based on the barrels that you've had experience with. i.e., the velocity loss from 30" to 25" is going to be less significant than from 25" to 20". but it would take some significant testing or experience to say just how much the velocity loss would be. granted this may be affected by the powder that you're using. </p><p> </p><p>at first i was leaning toward a 27-28" barrel but i'm not shooting an RUM case that benefits significantly from the extra length. i'm willing to consider a significanty shorter barrel if i can generate anywhere close to the same velocity. i have no problem "hot rodding" this barrel and don't care about barrel life. this barrel will be threaded for the future addition of a can if that itch persists and i really don't hate the idea of a shorter barrel if i'm going to have a can because 28" + can will look like i'm heading for a jousting match.</p></blockquote><p></p>
[QUOTE="CBS, post: 767218, member: 11718"] thanks for the responses guys. i'm feeling more comfortable about having this coversation on this forum considering the quality of the responses thus far. this barrel is MTU contour. not really what i'd prefer for this rifle but the barrel channel in the stock was already widened by the previous owner for a similar sized barrel (1-14 twist). i'd like to get a little more specific about your experiences with the .243. while longer barrels produce more velocity and everyone likes to use the 50fps/inch rule of thumb that i think is very vague and rarely true. i've seen experiments where guys cut an inch at a time off of a .223 to test velocity loss per inch and i was surprised at the relatively small amount of velocity loss per inch. (if i remember right the largest velocity loss per inch was 33fps.) i'd like some estimate from some of you as to how much velocity is actually given up by cutting a .243 barrel down based on the barrels that you've had experience with. i.e., the velocity loss from 30" to 25" is going to be less significant than from 25" to 20". but it would take some significant testing or experience to say just how much the velocity loss would be. granted this may be affected by the powder that you're using. at first i was leaning toward a 27-28" barrel but i'm not shooting an RUM case that benefits significantly from the extra length. i'm willing to consider a significanty shorter barrel if i can generate anywhere close to the same velocity. i have no problem "hot rodding" this barrel and don't care about barrel life. this barrel will be threaded for the future addition of a can if that itch persists and i really don't hate the idea of a shorter barrel if i'm going to have a can because 28" + can will look like i'm heading for a jousting match. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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max effective barrel length for .243?
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