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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.240 Incinerator ?
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<blockquote data-quote="Fiftydriver" data-source="post: 181668" data-attributes="member: 10"><p>When I say lightweight bullets in the 6mm bore, I am referring to bullets in the 75 gr or lighter weight ranges, similiar bullets in the 6.5mm bore diameter would be something like 85 grain bullets or lighter.</p><p> </p><p>A 120 gr bullet in the 6.5mm is certainly not what I would consider lightweight, its a middle weight bullet. I am sure this is why you are seeing good results. I have never said that lightweight bullets can not be accurate either.</p><p> </p><p>In my 257 Allen Magnum, I get the 100 gr BT up to 4100 fps and groups in the 1/2 moa range at 500 yards with my medium weight sporter rifles. Extreme spreads are generally in the 30-40 fps range. Drop in a 130 gr Wildcat and those extreme spreads drop to 20-30 fps and groups at 500 yards drop to 1.5 to 2" groups in good conditions.</p><p> </p><p>Jump up to a 156 gr ULD RBBT and velocity spreads will drop to the high teens to 20 fps range and groups will often even tighter then the 130 gr loads.</p><p> </p><p>That is my point, the heavier the bullets in large capacity rounds, the easier it is to get them into tight groups at long range and result in smaller velocity spreads.</p><p> </p><p>Again, my defination of lightweight bullets was misunderstood or not defined for 6.5mm bullets, Anything less then 100 gr in the 6.5mm, I would consider lightweight bullets, espeically for the capacity your using. Now if you were talking about a 6.5-06, 100 gr would not be overly lightweight.</p><p> </p><p>Its all relative to bore diameter and case capacity.</p><p> </p><p>Most any quality bullet can be made to shoot well in any capacity, that does not mean its the best bullet for a specific application. Generally with large case capacities in small bores, heavier is better.</p><p> </p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 181668, member: 10"] When I say lightweight bullets in the 6mm bore, I am referring to bullets in the 75 gr or lighter weight ranges, similiar bullets in the 6.5mm bore diameter would be something like 85 grain bullets or lighter. A 120 gr bullet in the 6.5mm is certainly not what I would consider lightweight, its a middle weight bullet. I am sure this is why you are seeing good results. I have never said that lightweight bullets can not be accurate either. In my 257 Allen Magnum, I get the 100 gr BT up to 4100 fps and groups in the 1/2 moa range at 500 yards with my medium weight sporter rifles. Extreme spreads are generally in the 30-40 fps range. Drop in a 130 gr Wildcat and those extreme spreads drop to 20-30 fps and groups at 500 yards drop to 1.5 to 2" groups in good conditions. Jump up to a 156 gr ULD RBBT and velocity spreads will drop to the high teens to 20 fps range and groups will often even tighter then the 130 gr loads. That is my point, the heavier the bullets in large capacity rounds, the easier it is to get them into tight groups at long range and result in smaller velocity spreads. Again, my defination of lightweight bullets was misunderstood or not defined for 6.5mm bullets, Anything less then 100 gr in the 6.5mm, I would consider lightweight bullets, espeically for the capacity your using. Now if you were talking about a 6.5-06, 100 gr would not be overly lightweight. Its all relative to bore diameter and case capacity. Most any quality bullet can be made to shoot well in any capacity, that does not mean its the best bullet for a specific application. Generally with large case capacities in small bores, heavier is better. Kirby Allen(50) [/QUOTE]
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