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<blockquote data-quote="ss8541" data-source="post: 6603" data-attributes="member: 104"><p>Finris, the 240 MK also calls for a 1-9 twist. I spoke to Gerard the owner of GS customs a few months ago, him and I both agreed that at those velocities his bullets should be stable out to at least 1300 meters. I have a longish throat in my rifle which makes it difficult to seat the bullets out to touching the lands. I feel that with this design I was getting a sideways jump with the bullet. If you can you may want to try seating them into the lands. I only had one box of the bullets on hand so I just did some limited testing. I shot one 3 shot group out at 706 yards and the same load that produced 1.5 MOA at 100 y, printed .94 MOA at that range. This would possibly indicate that it is taking a while for them to settle down possibly due to lack of twist. With the increased case capacity you will have over my 300 RUM, you may want to try going one step slower with the powder. I use a compressed load in my 7 STW and have no problem getting the 130 HV bullets to shoot in the .2 to .3 range consistently.</p><p>Vince</p></blockquote><p></p>
[QUOTE="ss8541, post: 6603, member: 104"] Finris, the 240 MK also calls for a 1-9 twist. I spoke to Gerard the owner of GS customs a few months ago, him and I both agreed that at those velocities his bullets should be stable out to at least 1300 meters. I have a longish throat in my rifle which makes it difficult to seat the bullets out to touching the lands. I feel that with this design I was getting a sideways jump with the bullet. If you can you may want to try seating them into the lands. I only had one box of the bullets on hand so I just did some limited testing. I shot one 3 shot group out at 706 yards and the same load that produced 1.5 MOA at 100 y, printed .94 MOA at that range. This would possibly indicate that it is taking a while for them to settle down possibly due to lack of twist. With the increased case capacity you will have over my 300 RUM, you may want to try going one step slower with the powder. I use a compressed load in my 7 STW and have no problem getting the 130 HV bullets to shoot in the .2 to .3 range consistently. Vince [/QUOTE]
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