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Rifles, Reloading, Optics, Equipment
Reloading
338 lapua/300 gr bullets/2800 fps minimum?
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<blockquote data-quote="orch" data-source="post: 1065333" data-attributes="member: 35688"><p>Hey there...</p><p>I'd wonder if your scopes don't track the same.... My ballistics app tells me that a 300gr berger @2700fps would need about 5 moa more at a mile than one going 2800 all other variables being equal... Maybe you scope is giving you a small fraction more than 0.25 moa/click and your buddy's scope is giving a small fraction less than 0.25 moa per click... I guess it Doesn't really matter, as long as you are hitting consistently and have your dope verified you're good to go.</p><p></p><p>you could always run your scopes through a elevation test at 100 yards to verify they are in fact adjusting true .... Just get a big piece of of card board or ply wood (6 or 8 feet tall) at 100 yrds and put an aiming point at the bottom then shoot a group' then crank your elevation knob up 60 moa and shoot another group using the same aiming point measure the distance between the center of the two groups. If your scope clicks are a true 0.25 moa you should get about 62.8" between the centres of yor groups.</p><p></p><p>Don't think it would be anything to do with your neck tension causing increased pressure, because that would just translate into higher muzzle velocity... Unless of course your chronograph was off you really could be getting 2800... I'm assuming you guys used the same chronograph on the same day to get your speeds...</p><p></p><p>Other things that could be going on: your buddy's barrel is engraving the bullets more causing slightly more drag on his bullet, new lot of powder or batch of reloads since u chrono'd and you are maybe getting a bit more speed... Can't think of anything else right now... But I'd be most suspicious that it may be tracking of your scope....</p><p></p><p>Anyways.... Not that it matters, sounds like u guys are having a blast stretching the legs on your 338's! ... Making me a little jealous actually... Ive only got mine out to about 1300 yards...</p><p>Orch</p></blockquote><p></p>
[QUOTE="orch, post: 1065333, member: 35688"] Hey there... I'd wonder if your scopes don't track the same.... My ballistics app tells me that a 300gr berger @2700fps would need about 5 moa more at a mile than one going 2800 all other variables being equal... Maybe you scope is giving you a small fraction more than 0.25 moa/click and your buddy's scope is giving a small fraction less than 0.25 moa per click... I guess it Doesn't really matter, as long as you are hitting consistently and have your dope verified you're good to go. you could always run your scopes through a elevation test at 100 yards to verify they are in fact adjusting true .... Just get a big piece of of card board or ply wood (6 or 8 feet tall) at 100 yrds and put an aiming point at the bottom then shoot a group' then crank your elevation knob up 60 moa and shoot another group using the same aiming point measure the distance between the center of the two groups. If your scope clicks are a true 0.25 moa you should get about 62.8" between the centres of yor groups. Don't think it would be anything to do with your neck tension causing increased pressure, because that would just translate into higher muzzle velocity... Unless of course your chronograph was off you really could be getting 2800... I'm assuming you guys used the same chronograph on the same day to get your speeds... Other things that could be going on: your buddy's barrel is engraving the bullets more causing slightly more drag on his bullet, new lot of powder or batch of reloads since u chrono'd and you are maybe getting a bit more speed... Can't think of anything else right now... But I'd be most suspicious that it may be tracking of your scope.... Anyways.... Not that it matters, sounds like u guys are having a blast stretching the legs on your 338's! ... Making me a little jealous actually... Ive only got mine out to about 1300 yards... Orch [/QUOTE]
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Reloading
338 lapua/300 gr bullets/2800 fps minimum?
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