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Crazy grouping
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<blockquote data-quote="Bullet bumper" data-source="post: 856108" data-attributes="member: 17844"><p>It is not clear in your post which ammo produced the bad accuracy .</p><p>You say you had .5 groups with Fedral factory ammo at 100 yards wow that's very good for a 300 magnum in a hunting rifle with factory ammo.</p><p>Did the Federal factory ammo suddenly start shooting bad or was it only the handloads that shot bad ?</p><p>Tracking down an accuracy problem reqires strict attention to details and a systematic approach to elliminating each possibility one at a time. </p><p>If the ammo that gave .5 @ 100 yards is also shooting bad now at 200 as you say off a 16 inch wide target then that's a big group scatter or POI change.</p><p>Go back to 100 yards and try to re produce the good accuracy .</p><p>If you can then it must be the reloads. </p><p>If you can't and all the ammo is now bad then it must be the scope , gun or you .</p><p>If you have a spare scope swap it out and try again with the ammo that showed good accuracy at first. </p><p>Work through the scope , mounts , bedding , action screws, and if all seems good then it may be that your barrel twist can not handle the Berger VLD bullets . Berger say 1 in 12 for that bullet so I would suspect it was fast enough . </p><p>The other thing is , is the barrel new ? If it's a worn barrel boat tail bullets might be no good but it could still shoot flat base ok . </p><p>Try the 150 grain Berger flat base and if it suddenly starts to shoot better groups then the barrel may be on it's way out.</p></blockquote><p></p>
[QUOTE="Bullet bumper, post: 856108, member: 17844"] It is not clear in your post which ammo produced the bad accuracy . You say you had .5 groups with Fedral factory ammo at 100 yards wow that's very good for a 300 magnum in a hunting rifle with factory ammo. Did the Federal factory ammo suddenly start shooting bad or was it only the handloads that shot bad ? Tracking down an accuracy problem reqires strict attention to details and a systematic approach to elliminating each possibility one at a time. If the ammo that gave .5 @ 100 yards is also shooting bad now at 200 as you say off a 16 inch wide target then that's a big group scatter or POI change. Go back to 100 yards and try to re produce the good accuracy . If you can then it must be the reloads. If you can't and all the ammo is now bad then it must be the scope , gun or you . If you have a spare scope swap it out and try again with the ammo that showed good accuracy at first. Work through the scope , mounts , bedding , action screws, and if all seems good then it may be that your barrel twist can not handle the Berger VLD bullets . Berger say 1 in 12 for that bullet so I would suspect it was fast enough . The other thing is , is the barrel new ? If it's a worn barrel boat tail bullets might be no good but it could still shoot flat base ok . Try the 150 grain Berger flat base and if it suddenly starts to shoot better groups then the barrel may be on it's way out. [/QUOTE]
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