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Rifles, Reloading, Optics, Equipment
Reloading
What could be causing my first shot hitting target off group?
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<blockquote data-quote="fabio" data-source="post: 113809" data-attributes="member: 5554"><p>Thank you for your replies.</p><p></p><p>That's right: Ambient temperature is a variable element I did not consider… and all my previous ammo testing have been conducted at a much lower temperature (around 8-10C° compared to actual 23C°)</p><p></p><p>The groups were fired from a cold barrel with 10-15 previous fired shots after last cleaning.</p><p></p><p>The first two shots are fired with a 15-20 seconds interval and the third one 40-60 seconds after the second One.</p><p></p><p>I'm always trying to recreate typical hunting conditions where the first shot is the one that counts and where the second shot might be a follow up shot at a running fox and the third one at the same (young) fox (or at another one) after he stops a while trying to figure out where the threat is coming from… </p><p></p><p>I'm going back at the shooting range this afternoon for some more ammo testing including those that are usually grouping the typical fine way.</p><p>Any way my 7mmRM sporter barrel is quite fussy about the ammo he likes:</p><p>The few he likes he's grouping outstanding well (3 shots into 1.6cm at100m) whether he deceives completely with about all the others he does not printing lousy 5-6cm groups. That is sadly the case with the fine accuracy renowned factory Federal 140gr ballistic tips.</p><p>He loves heavier bullets with cylindrical long rifling contacting surface such as the RWS tig.</p><p></p><p>I'm thinking about changing barrel for a 300WM or the 300RUM but I'm wondering if the latter with a sporter contoured barrel will not be kicking too much compared to 7RM…</p></blockquote><p></p>
[QUOTE="fabio, post: 113809, member: 5554"] Thank you for your replies. That’s right: Ambient temperature is a variable element I did not consider… and all my previous ammo testing have been conducted at a much lower temperature (around 8-10C° compared to actual 23C°) The groups were fired from a cold barrel with 10-15 previous fired shots after last cleaning. The first two shots are fired with a 15-20 seconds interval and the third one 40-60 seconds after the second One. I’m always trying to recreate typical hunting conditions where the first shot is the one that counts and where the second shot might be a follow up shot at a running fox and the third one at the same (young) fox (or at another one) after he stops a while trying to figure out where the threat is coming from… I’m going back at the shooting range this afternoon for some more ammo testing including those that are usually grouping the typical fine way. Any way my 7mmRM sporter barrel is quite fussy about the ammo he likes: The few he likes he’s grouping outstanding well (3 shots into 1.6cm at100m) whether he deceives completely with about all the others he does not printing lousy 5-6cm groups. That is sadly the case with the fine accuracy renowned factory Federal 140gr ballistic tips. He loves heavier bullets with cylindrical long rifling contacting surface such as the RWS tig. I’m thinking about changing barrel for a 300WM or the 300RUM but I’m wondering if the latter with a sporter contoured barrel will not be kicking too much compared to 7RM… [/QUOTE]
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What could be causing my first shot hitting target off group?
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