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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Long range barrel profile
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<blockquote data-quote="ds" data-source="post: 100569" data-attributes="member: 3050"><p>I am not sure how clear cut this is, firstly I use a fairly heavy profile barrel like 32mm dia, no taper for 28" and have found load development to be very easy - may be due to less magnitude of vibration. Now having said that in .22 BR they use long skinny barrels with tuners ( a lot has been written and proved by Calfee on that) but in .22 the ammunition is all factory fodder so you have to tune the barrel to the ammo. With centre fire you can tune the ammo to the barrel by altering COL length - change bullet seating, change the harmonics. I think some centre fire BR rules have changed to allow tuners, I guess it will take a few years to see if they become popular or not if so barrel profiles are likely to become longer and thinner.</p><p></p><p>In Rifle Shooter D.Tubb said he thought fat and heavy barrels were more accurate but has since changed his mind - the T2K profile being optimal. </p><p></p><p>Has anyone given any thought to what is meant by accuracy and duration of it, in other words if you want one 5 shot group a thin barrel may well be able to do that but a 20 shot group a heavy barrel is likely to change less - more steel to absorb more heat, less in bore dimension changes plus another advantage more resistant to torque.</p><p></p><p>Just some thoughts and no flame to anyone.</p><p></p><p>David.</p></blockquote><p></p>
[QUOTE="ds, post: 100569, member: 3050"] I am not sure how clear cut this is, firstly I use a fairly heavy profile barrel like 32mm dia, no taper for 28" and have found load development to be very easy - may be due to less magnitude of vibration. Now having said that in .22 BR they use long skinny barrels with tuners ( a lot has been written and proved by Calfee on that) but in .22 the ammunition is all factory fodder so you have to tune the barrel to the ammo. With centre fire you can tune the ammo to the barrel by altering COL length - change bullet seating, change the harmonics. I think some centre fire BR rules have changed to allow tuners, I guess it will take a few years to see if they become popular or not if so barrel profiles are likely to become longer and thinner. In Rifle Shooter D.Tubb said he thought fat and heavy barrels were more accurate but has since changed his mind - the T2K profile being optimal. Has anyone given any thought to what is meant by accuracy and duration of it, in other words if you want one 5 shot group a thin barrel may well be able to do that but a 20 shot group a heavy barrel is likely to change less - more steel to absorb more heat, less in bore dimension changes plus another advantage more resistant to torque. Just some thoughts and no flame to anyone. David. [/QUOTE]
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Long range barrel profile
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