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Rifles, Reloading, Optics, Equipment
Reloading
Bullet Seating Depth
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<blockquote data-quote="260VLD" data-source="post: 977076" data-attributes="member: 65943"><p>The only time I bother getting real picky about batching bullets is for 1000 yards Palma Matches . Elevation Elevation Elevation ! The best wind reader on the planet will suffer if the vertical dispersion of his ammo is BIG ! </p><p>Now as you are aware there are various gadget gimmicks and paraphernalia that allows hand loaders to tweak cases , projectiles , measure this and measure that BUT there will be a point of diminished returns.</p><p>Example : bullet pointing and meplat trimming works , how much , is always a question for debate and can reduce vertical dispersion by as little as 1/10 MOA and some say better than 1/2MOA @ 1000 yards. The bull measures approx 20 inches the X ring 10.</p><p>Personally , I know I can't hold better than 1 MOA on a good day , so pointing and trimming meplats for me is a time waster OR a diminished return.</p><p>As far as seating depth goes , I use a Redding instant indicator , I have a dummy round set up to the seating depth using Berger 155.5 projectiles. I set the dummy up and zero the dial indicator , I then nominally seat my bullets and then one by one check the length in the indicator and re seat each projectile accordingly. Therefore I now have 25 rounds for match all with a jump of thirty thou , the seating depth of the <u><strong>base</strong></u> of those projectiles will and do vary but I am looking for consistent jump length. Important to note that the Redding Indicator takes measurement from an internal bush which makes contact pretty near the ogive so one needs to be mindful that when seating the bullet, the seater stem WILL NOT contact every projectile in the exact same place , and it takes a bit of practise to know how much to rotate the micrometer seater. I know with mine , a 1 thou increase on the dial will give me nearly 2 thou extra depth, so I compensate for this error.</p><p>I have yet to see any effect on my scores caused by the increase of 2 or 3 thou or more in base depth. For the short ranges 300-700 yards I don't even bother with the above procedure, I just load them straight out of the box , and for some big meets I will do the seating procedure for my 800 900 yard ammo.</p><p>For hunting ammo , I seat to mag length and don't batch projectiles at all , even for one of my single shot rifles where I can control seat depth, I don't bother.</p><p>I have a buddy that tweaks , cleans , bends, shapes anything he can with his ammo,he is an accountant so is anal by profession. Sometimes he eats the bear , sometimes the bear eats him , I guess what I am trying to say is , one has to decide to what lengths and expense one is prepared to go to before the returns are diminished.But if you shoot BR then you better be anal if you wish to compete.</p><p></p><p>regards</p><p>Mike.</p></blockquote><p></p>
[QUOTE="260VLD, post: 977076, member: 65943"] The only time I bother getting real picky about batching bullets is for 1000 yards Palma Matches . Elevation Elevation Elevation ! The best wind reader on the planet will suffer if the vertical dispersion of his ammo is BIG ! Now as you are aware there are various gadget gimmicks and paraphernalia that allows hand loaders to tweak cases , projectiles , measure this and measure that BUT there will be a point of diminished returns. Example : bullet pointing and meplat trimming works , how much , is always a question for debate and can reduce vertical dispersion by as little as 1/10 MOA and some say better than 1/2MOA @ 1000 yards. The bull measures approx 20 inches the X ring 10. Personally , I know I can't hold better than 1 MOA on a good day , so pointing and trimming meplats for me is a time waster OR a diminished return. As far as seating depth goes , I use a Redding instant indicator , I have a dummy round set up to the seating depth using Berger 155.5 projectiles. I set the dummy up and zero the dial indicator , I then nominally seat my bullets and then one by one check the length in the indicator and re seat each projectile accordingly. Therefore I now have 25 rounds for match all with a jump of thirty thou , the seating depth of the [U][B]base[/B][/U] of those projectiles will and do vary but I am looking for consistent jump length. Important to note that the Redding Indicator takes measurement from an internal bush which makes contact pretty near the ogive so one needs to be mindful that when seating the bullet, the seater stem WILL NOT contact every projectile in the exact same place , and it takes a bit of practise to know how much to rotate the micrometer seater. I know with mine , a 1 thou increase on the dial will give me nearly 2 thou extra depth, so I compensate for this error. I have yet to see any effect on my scores caused by the increase of 2 or 3 thou or more in base depth. For the short ranges 300-700 yards I don't even bother with the above procedure, I just load them straight out of the box , and for some big meets I will do the seating procedure for my 800 900 yard ammo. For hunting ammo , I seat to mag length and don't batch projectiles at all , even for one of my single shot rifles where I can control seat depth, I don't bother. I have a buddy that tweaks , cleans , bends, shapes anything he can with his ammo,he is an accountant so is anal by profession. Sometimes he eats the bear , sometimes the bear eats him , I guess what I am trying to say is , one has to decide to what lengths and expense one is prepared to go to before the returns are diminished.But if you shoot BR then you better be anal if you wish to compete. regards Mike. [/QUOTE]
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