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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist rate for my new 7mm Krieger barrel
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<blockquote data-quote="Buffalobob" data-source="post: 63035" data-attributes="member: 8"><p>I believe the early Weatherby 7 mm s had a twist rate of 1 in 12 and then in the mid 1960's they moved to a 1 in 10 in order to stablize the heavier bullets i.e 150 - 175 grns. For a while I shot a NIB 1969 mark V 7mm with 1 in 10 at chucks and crows using 115 and 120 HPs and corresponded with Wby concerning the difficulty of stabilizing these bullets and they were very clear about their decision to go to the faster twist. ( I was complaining about only getting 0.5MOA with 120 HP @ 3500 fps and finally just got a custom 25-06 that would go 0.2-0.3 MOA.) My experience is that the 1 in 10 is good for 140, 154, 160, 162HPBT and 168 SMK in both the orignal barrel and on a custom Ruger #1 with Shilen barrel. I only shoot 175 grs if forced to so have no opinion on their accuracy in that twist.</p></blockquote><p></p>
[QUOTE="Buffalobob, post: 63035, member: 8"] I believe the early Weatherby 7 mm s had a twist rate of 1 in 12 and then in the mid 1960's they moved to a 1 in 10 in order to stablize the heavier bullets i.e 150 - 175 grns. For a while I shot a NIB 1969 mark V 7mm with 1 in 10 at chucks and crows using 115 and 120 HPs and corresponded with Wby concerning the difficulty of stabilizing these bullets and they were very clear about their decision to go to the faster twist. ( I was complaining about only getting 0.5MOA with 120 HP @ 3500 fps and finally just got a custom 25-06 that would go 0.2-0.3 MOA.) My experience is that the 1 in 10 is good for 140, 154, 160, 162HPBT and 168 SMK in both the orignal barrel and on a custom Ruger #1 with Shilen barrel. I only shoot 175 grs if forced to so have no opinion on their accuracy in that twist. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist rate for my new 7mm Krieger barrel
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