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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger Bullets
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<blockquote data-quote="lancetkenyon" data-source="post: 2533365" data-attributes="member: 68875"><p>A 156 is plenty of bullet weight in 6.5mm. Very few chamberings could take advantage of them excpet maybe a .264 WM, 26 Nosler, or 6.5-.300Wby, and ZERO current rifles or hardly zero barrel twists would support them. You would need at least a 1:7" to optimize them.</p><p></p><p>If you want a 170+, go to a .277 or .284.</p><p></p><p>At these numbers, I only get a stability factor of 1.51. Stable. but....</p><p></p><p>If Berger states the 156 needs a <em>minimum</em> twist rate of 1:8" (note MINIMUM, not OPTIMAL), I would highly doubt a 170 Elite/Hyb/VLD would need less than 1:7.5" MINIMUM, and 1:7" would probably be more realistic for a wide range of shooting conditions.</p><p></p><p>The 156 Elite is 1.510" long, and the 140 Elite is 1.40" long. Seems like a 170 would be about 1.60" long. 3000fps would be a big case speed. Like the .264WM/26 Nosler/6.5-.300Wby number. 1:8" would be marginal for a lot of hunters. a 175 would probably be closer to 1.62+" long. Making it a stability factor of 1.41 in a 1:8". Marginal.</p><p> </p><p>That would be a game crusher though, as SD would be off the charts. But would take a lot more to outrun a 156 at a higher velocity.</p><p></p><p>Looking at numbers:</p><p>Typical late elk hunt, 35* and 6500'.</p><p>To maintain 1800fps and 1500ft/lbs minimum:</p><p>1:7.5" twist</p><p>156 @ 3066fps = 940 yards 1496ft/lbs, 2078fps remaining, 168" drop (this is my actual 6.5SS hunting load)</p><p>170 @ 2950fps = 940 yards 1498ft/lbs, 1992fps remaining, 183" drop (hypothetical speed based on what I have observed with a lot of testing between differing bullet weights in 6.5mm)</p><p></p><p>If you want to throw deer in there, drop minimum requirements to 1800fps and 1000ft/lbs:</p><p>140 Hyb @ 3156fps = 1210 yards 1801fps, 1008ft/lbs</p><p>156 Elite @ 3066fps = 1250 yards 1800fps, 1120ft/lbs</p><p>170 Hypo @ 2950fps = 1160 yards 1800fps, 1222ft/lbs</p></blockquote><p></p>
[QUOTE="lancetkenyon, post: 2533365, member: 68875"] A 156 is plenty of bullet weight in 6.5mm. Very few chamberings could take advantage of them excpet maybe a .264 WM, 26 Nosler, or 6.5-.300Wby, and ZERO current rifles or hardly zero barrel twists would support them. You would need at least a 1:7" to optimize them. If you want a 170+, go to a .277 or .284. At these numbers, I only get a stability factor of 1.51. Stable. but.... If Berger states the 156 needs a [I]minimum[/I] twist rate of 1:8" (note MINIMUM, not OPTIMAL), I would highly doubt a 170 Elite/Hyb/VLD would need less than 1:7.5" MINIMUM, and 1:7" would probably be more realistic for a wide range of shooting conditions. The 156 Elite is 1.510" long, and the 140 Elite is 1.40" long. Seems like a 170 would be about 1.60" long. 3000fps would be a big case speed. Like the .264WM/26 Nosler/6.5-.300Wby number. 1:8" would be marginal for a lot of hunters. a 175 would probably be closer to 1.62+" long. Making it a stability factor of 1.41 in a 1:8". Marginal. That would be a game crusher though, as SD would be off the charts. But would take a lot more to outrun a 156 at a higher velocity. Looking at numbers: Typical late elk hunt, 35* and 6500'. To maintain 1800fps and 1500ft/lbs minimum: 1:7.5" twist 156 @ 3066fps = 940 yards 1496ft/lbs, 2078fps remaining, 168" drop (this is my actual 6.5SS hunting load) 170 @ 2950fps = 940 yards 1498ft/lbs, 1992fps remaining, 183" drop (hypothetical speed based on what I have observed with a lot of testing between differing bullet weights in 6.5mm) If you want to throw deer in there, drop minimum requirements to 1800fps and 1000ft/lbs: 140 Hyb @ 3156fps = 1210 yards 1801fps, 1008ft/lbs 156 Elite @ 3066fps = 1250 yards 1800fps, 1120ft/lbs 170 Hypo @ 2950fps = 1160 yards 1800fps, 1222ft/lbs [/QUOTE]
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