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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Seating depth mystery!
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<blockquote data-quote="elkaholic" data-source="post: 394611" data-attributes="member: 13833"><p>I was shooting my 6.5 Sherman today with the intention of testing accuracy with different seating depths. I have been seating the 140 Bergers about .010" into the lands with good results but was curious to see what the results would be if I went the other way with large jumps. I was shooting 63 grs. of retumbo with the following seating depths. (1) .010" into lands. (2).040" off of lands (3) .100" off of lands. (1) three shots averaged 3125'. (2) 3 shots averaged 3172 (3) 3 shots averaged 3146'. I thought this was really odd since the spreads within groups averaged 10-15' and the second group seated .040" off the lands was considerably higher than either end? I decided that it might be a brass problem so I reloaded the same three groups only switched brass between seating groups. The temp had cooled off so velocities were a little lower but the results for seating depths remained consistent. Groups 1 and 3 came closer together for avg. but group 2 (.040" off lands) remained about 40' faster on avg. I didn't get around to finishing my original goal because I am still scratching my head as to how this could be? Does anyone have an explanation for this.......Rich</p></blockquote><p></p>
[QUOTE="elkaholic, post: 394611, member: 13833"] I was shooting my 6.5 Sherman today with the intention of testing accuracy with different seating depths. I have been seating the 140 Bergers about .010" into the lands with good results but was curious to see what the results would be if I went the other way with large jumps. I was shooting 63 grs. of retumbo with the following seating depths. (1) .010" into lands. (2).040" off of lands (3) .100" off of lands. (1) three shots averaged 3125'. (2) 3 shots averaged 3172 (3) 3 shots averaged 3146'. I thought this was really odd since the spreads within groups averaged 10-15' and the second group seated .040" off the lands was considerably higher than either end? I decided that it might be a brass problem so I reloaded the same three groups only switched brass between seating groups. The temp had cooled off so velocities were a little lower but the results for seating depths remained consistent. Groups 1 and 3 came closer together for avg. but group 2 (.040" off lands) remained about 40' faster on avg. I didn't get around to finishing my original goal because I am still scratching my head as to how this could be? Does anyone have an explanation for this.......Rich [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Seating depth mystery!
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