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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bench Mark 3 grove button rifled
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<blockquote data-quote="royinidaho" data-source="post: 268640" data-attributes="member: 2011"><p>Hmmmmm,</p><p></p><p>My 270AM is one of the early ones. 3 groove Lilja with a 7 something twist, I think.</p><p></p><p>169.5 WCs, which are/were a taped jacket, heavy on the back end were a dream up to as fast as I could get them going. Well over 3300 just for kicks.</p><p></p><p>However, the 195 with its much longer bearing surface was on the ragged edge of destruction at 3050. After a few of these were shot about 3 of 5 never made it to the 200 yd berm. Emperical data indicates that 50% of the Lilja 3 groove fast twist bbls began dusting the 195s after somewhere around 400 rounds. The other 50% have not problems, yet. Go figger.....</p><p></p><p>Berger 150 held together but couldn't take the punishment of being launched into that twist at only low velocities for the AM.</p><p></p><p>If I recall correctly there may have been/be similar problems with the 7 AM and 200 grain WCs. Again, if I recall correctly a fella tried several different barrels and ended up with a Broughton 5R before things became perfect.</p><p></p><p>I've been considering a Schneider barrel for my next build to get away from the rifling problems. However, it will most probably be a 10 twist 375 bore.</p></blockquote><p></p>
[QUOTE="royinidaho, post: 268640, member: 2011"] Hmmmmm, My 270AM is one of the early ones. 3 groove Lilja with a 7 something twist, I think. 169.5 WCs, which are/were a taped jacket, heavy on the back end were a dream up to as fast as I could get them going. Well over 3300 just for kicks. However, the 195 with its much longer bearing surface was on the ragged edge of destruction at 3050. After a few of these were shot about 3 of 5 never made it to the 200 yd berm. Emperical data indicates that 50% of the Lilja 3 groove fast twist bbls began dusting the 195s after somewhere around 400 rounds. The other 50% have not problems, yet. Go figger..... Berger 150 held together but couldn't take the punishment of being launched into that twist at only low velocities for the AM. If I recall correctly there may have been/be similar problems with the 7 AM and 200 grain WCs. Again, if I recall correctly a fella tried several different barrels and ended up with a Broughton 5R before things became perfect. I've been considering a Schneider barrel for my next build to get away from the rifling problems. However, it will most probably be a 10 twist 375 bore. [/QUOTE]
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Bench Mark 3 grove button rifled
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