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Long Range Hunting & Shooting
How i hate shooting 100yds?
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<blockquote data-quote="Lefty7mmstw" data-source="post: 1006113" data-attributes="member: 48043"><p>I've got a few rifles that don't even group well until they are fouled, others that have less than 1/2 moa poi change or shoot the first three into a good group off the bat. </p><p> </p><p>My marlin 270 won't shoot worth a hoot until you've got a couple of groups down her, then she settles into moa (or just under) for another box or two. If you keep shooting her she will actually keep shooting tighter groups until she gets to about 2/3 moa.. My browning 300win put the first three into 1.25" at 201 yards last weekend off of a fresh bore using hand loaded rem 165 grain core loct bullets. Not my first bullet choice, but they are from a time when $$ were more important to me than the perfect bullet and they were cheap at the time.</p><p> </p><p>It all depends on the bore but usually you will have a bit of change between a fresh and fouled bore.</p><p> </p><p>One other thing that matters is the temperature of the bore, as hotter barrels will most often produce more pressure than a colder barrel. I've seen it on my old 7stw using pressure trace... A load can climb better than 5,000 psi as your barrel heats; that often will affect accuracy also, especially if you are using a load with a pronounced accuracy node. </p><p> </p><p> (I avoid like the plague any load that seems to have any real fall off in accuracy because of temperature or charge weight but that is for another discussion)</p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 1006113, member: 48043"] I've got a few rifles that don't even group well until they are fouled, others that have less than 1/2 moa poi change or shoot the first three into a good group off the bat. My marlin 270 won't shoot worth a hoot until you've got a couple of groups down her, then she settles into moa (or just under) for another box or two. If you keep shooting her she will actually keep shooting tighter groups until she gets to about 2/3 moa.. My browning 300win put the first three into 1.25" at 201 yards last weekend off of a fresh bore using hand loaded rem 165 grain core loct bullets. Not my first bullet choice, but they are from a time when $$ were more important to me than the perfect bullet and they were cheap at the time. It all depends on the bore but usually you will have a bit of change between a fresh and fouled bore. One other thing that matters is the temperature of the bore, as hotter barrels will most often produce more pressure than a colder barrel. I've seen it on my old 7stw using pressure trace... A load can climb better than 5,000 psi as your barrel heats; that often will affect accuracy also, especially if you are using a load with a pronounced accuracy node. (I avoid like the plague any load that seems to have any real fall off in accuracy because of temperature or charge weight but that is for another discussion) [/QUOTE]
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