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The Range
Ammo & Reloading
7.92x57 / 8MM Mauser Loads
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<blockquote data-quote="swampratt" data-source="post: 3143696" data-attributes="member: 15054"><p>I do not have that size but my .308 and 30-06 and .243 all shoot different when temps change using Varget.</p><p>If I use the old IMR 4064 I keep my group size no matter the temps 17 to 100 they stay the same.</p><p></p><p>4064 kicks about the same as varget and 8208 RL15 kicks less. but I had temp issues with 15 ..group sizes changed.</p><p></p><p>Something else that people do not realize is the bullet welding/fusing itself to the case.</p><p></p><p>If you loaded ammo that day of the shoot or say a few days before the shoot the fusing will not be an issue so much.</p><p></p><p>But let that ammo sit a month and you may notice the groups changed.</p><p></p><p>If this is the case the ammo has sat for some time then try this test.</p><p>Insert the ammo into the press and chuck up your seating die seat the bullet just a few thousandths deeper. notice if it is hard to seat it deeper..Sometimes you hear a POP as it breaks the fusing ..I can't think of a better word.</p><p></p><p>Very clean cases and clean bullets tend to do that.. carbon in the neck of the case or a moly bullet does not see these issues as much.</p><p></p><p>Of course crimped ammo may not change as much as non crimped..I do not crimp my rifle ammo.</p><p></p><p>LinearZero if you are having issues and using boat tail bullets try a flat base bullet.</p><p>If you are shooting flat base now I would look at all the brass prep.</p><p>Brass ID and OD need to be the same you change it .0005" and groups will suffer..yes 1/2 a thousandths.</p><p>VLD chamfer the case mouths if while seating bullets you are peeling the guilding metal from the bullet.</p><p></p><p>If you are peeling that bullet during seating you will copper foul the barrel quickly and accuracy will be terrible.</p><p>I have had guns that needed 20 rounds down the pipe to shoot really well. but after 45 rounds accuracy started dropping off.</p><p>That was a small sweet spot.</p><p>Finally broke it in well.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3143696, member: 15054"] I do not have that size but my .308 and 30-06 and .243 all shoot different when temps change using Varget. If I use the old IMR 4064 I keep my group size no matter the temps 17 to 100 they stay the same. 4064 kicks about the same as varget and 8208 RL15 kicks less. but I had temp issues with 15 ..group sizes changed. Something else that people do not realize is the bullet welding/fusing itself to the case. If you loaded ammo that day of the shoot or say a few days before the shoot the fusing will not be an issue so much. But let that ammo sit a month and you may notice the groups changed. If this is the case the ammo has sat for some time then try this test. Insert the ammo into the press and chuck up your seating die seat the bullet just a few thousandths deeper. notice if it is hard to seat it deeper..Sometimes you hear a POP as it breaks the fusing ..I can't think of a better word. Very clean cases and clean bullets tend to do that.. carbon in the neck of the case or a moly bullet does not see these issues as much. Of course crimped ammo may not change as much as non crimped..I do not crimp my rifle ammo. LinearZero if you are having issues and using boat tail bullets try a flat base bullet. If you are shooting flat base now I would look at all the brass prep. Brass ID and OD need to be the same you change it .0005" and groups will suffer..yes 1/2 a thousandths. VLD chamfer the case mouths if while seating bullets you are peeling the guilding metal from the bullet. If you are peeling that bullet during seating you will copper foul the barrel quickly and accuracy will be terrible. I have had guns that needed 20 rounds down the pipe to shoot really well. but after 45 rounds accuracy started dropping off. That was a small sweet spot. Finally broke it in well. [/QUOTE]
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