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Rifles, Reloading, Optics, Equipment
Reloading
Measuring Bullet Seating off the Lands
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<blockquote data-quote="mmmooretx" data-source="post: 401962" data-attributes="member: 18736"><p>I will pass one of my learning curve items on dies which happens to be on a 6.8 mm SPC AR-15. Because the bullets are shorter errors tend to get amplified. I was using RCBS SB dies and was getting variability of .008" while changing nothing. What it turned out to be was the cone inside the seating die was contacting the ogive further up (closer to the bullet tip) that caused the instability since the bullets had some minor variability there. Go with the competition grade seating dies that have the micrometer style adjustment. I get 3/8" groups at 100 yards with my 300 Win Mag and Forster seating die. Forster has stopped making the 6.8 seater so I got the Redding "S" competition seater and the cone that contacts the ogive is further back on the bullet and I get much better groups.</p><p>I am ready to try the Berger 210 gr. hunting rounds in my 300 win mag and did not have good luck at .008 off the lands. I found a thread at Berger and they recommend .030-.040 off the lands for finding your rifles sweet spot. I have talked to people that like them .015 into the lands and .080 off the lands. Your rifle will let you know. Use the ladder method to narrow your search, and save ammo. Only change one variable at a time, powder weight or OAL (distance from lands). I tend to find powder first then OAL second.</p><p>Good luck!</p></blockquote><p></p>
[QUOTE="mmmooretx, post: 401962, member: 18736"] I will pass one of my learning curve items on dies which happens to be on a 6.8 mm SPC AR-15. Because the bullets are shorter errors tend to get amplified. I was using RCBS SB dies and was getting variability of .008" while changing nothing. What it turned out to be was the cone inside the seating die was contacting the ogive further up (closer to the bullet tip) that caused the instability since the bullets had some minor variability there. Go with the competition grade seating dies that have the micrometer style adjustment. I get 3/8" groups at 100 yards with my 300 Win Mag and Forster seating die. Forster has stopped making the 6.8 seater so I got the Redding "S" competition seater and the cone that contacts the ogive is further back on the bullet and I get much better groups. I am ready to try the Berger 210 gr. hunting rounds in my 300 win mag and did not have good luck at .008 off the lands. I found a thread at Berger and they recommend .030-.040 off the lands for finding your rifles sweet spot. I have talked to people that like them .015 into the lands and .080 off the lands. Your rifle will let you know. Use the ladder method to narrow your search, and save ammo. Only change one variable at a time, powder weight or OAL (distance from lands). I tend to find powder first then OAL second. Good luck! [/QUOTE]
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Reloading
Measuring Bullet Seating off the Lands
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