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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need some input on a problem 338 RUM
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<blockquote data-quote="Lefty7mmstw" data-source="post: 1188814" data-attributes="member: 48043"><p>My 7stw did that crap last year with the 195 berger and rl33 when it got cold out. The poi started walking with barrel temp (up and left- it would toss a group, then a group a bit further over/up... progressively until you wanted to break the rifle in half), even though the load had proven good at warmer temps.... What I did was go back to post and start over. Luckily for me I have 300 of another known good load (140 nos ab with rl25 and a 215) so I re-zero'd and went to town. With the 140ab and rl25 I couldn't get the poi to move with bbl temp changes OR ambient temp. changes. <em>It was entirely the load and not in any way the rifle</em>... I also re-worked my 195 berger load with 7828 and it seemed fine no matter what, but I am sticking with the 140 for now in the rifle.</p><p></p><p>My new 300rum (rem m700 lr) has also done a bit of this with one load.... It is fully stable with at least two other loads. </p><p></p><p>I believe the ignition characteristics of some loads change drastically as the temp changes, no matter whether the powder is temp stable or not.</p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 1188814, member: 48043"] My 7stw did that crap last year with the 195 berger and rl33 when it got cold out. The poi started walking with barrel temp (up and left- it would toss a group, then a group a bit further over/up... progressively until you wanted to break the rifle in half), even though the load had proven good at warmer temps.... What I did was go back to post and start over. Luckily for me I have 300 of another known good load (140 nos ab with rl25 and a 215) so I re-zero'd and went to town. With the 140ab and rl25 I couldn't get the poi to move with bbl temp changes OR ambient temp. changes. [I]It was entirely the load and not in any way the rifle[/I]... I also re-worked my 195 berger load with 7828 and it seemed fine no matter what, but I am sticking with the 140 for now in the rifle. My new 300rum (rem m700 lr) has also done a bit of this with one load.... It is fully stable with at least two other loads. I believe the ignition characteristics of some loads change drastically as the temp changes, no matter whether the powder is temp stable or not. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need some input on a problem 338 RUM
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