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Rifles, Reloading, Optics, Equipment
Reloading
What's Causing Bullet Runout
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<blockquote data-quote="Tesoro" data-source="post: 1409864" data-attributes="member: 44340"><p>I dont think you should be measuring runout unless you also have a decent gauge to measure neck wall thickness! </p><p></p><p>Also you didnt mention anything about your case prep so lets start with this:</p><p></p><p>Think about it - if you have an uneven neck wall like 1.5 to 2 tho diff then when you size the neck you squash the unevenness to the inside while squaring up the neck to the case body via the die. And then you check your neck runout and its now passable of course. But then when you shove a bullet into that tight neck opening it is now not going into an even inside passageway so as a result the case neck is going to get slightly tweaked out of alignment with the case body. As the neck wall thicknesses can vary in a batch of cases you will find uneven runouts for that reason.</p><p></p><p>But beforehand you need to figure out your desired neck tension and use the correct bushing to get what you need based on the neck wall thickness. And you cant do this without having measured the neck walls!</p><p></p><p>I use a redding compet bushing die and get max .0015 runout but normally a tho or under. Redding wouldnt make them and we wouldnt use them if they caused extreme runout by themselves! </p><p></p><p>Once you have the case prep part all dialed in and still get unacceptable runout then can look at other culprits like uneven case neck lube (or not - I dont lube mine just brush them to get rid of any micro crud deposits). Also uneven or not sufficient chamfering after trimming. And then ensuring you have square ends on your neck. Alot of the 'decent' brand neck trimmers dont cut real square. If your neck isnt square then you cant chamfer evenly. I have found the wilson trimmer to work the best for me. </p><p></p><p>If you want to be splitting hairs on measuring runout then small things can make a noticeable diff. But in most instances its the lack of proper case selection and preparation that will make your gauge spike!</p><p> </p><p>I dont agree on recommending neck turning as it can create more probs than benefits if you are not careful and very experienced. I dont mess with turning as I only use brass with a max 1 tho neck thickness variation but most of it is .0005 variation. Most real good brass is like this about .0005-.001 difference. I would only neck turn if my necks were that even but too thick to give my preferred bullet tension. </p><p></p><p>I use a coax press which they say helps with runout but I dont believe it when using compet dies. But I prefer that press for other reasons.</p><p></p><p>The #1 tip is what the above guys mentioned about about rotating when seating. I have had some that I measured a bit out of whack and even then put back in the press to straighten by rotating all over again. But the rotating tip isnt going to help much if your brass is not all square and even to start with.</p><p></p><p>Hope this helps. </p><p></p><p>BTW I am not a competitive shooter but some experienced LR shooters have told me that anything 5 tho and under dosent seem to make any big diff in accuracy taking into consideration all the other factors. But I look at runout as just another challenge to master in reloading. I can make consistent ammo much better than I can shoot the stuff!</p></blockquote><p></p>
[QUOTE="Tesoro, post: 1409864, member: 44340"] I dont think you should be measuring runout unless you also have a decent gauge to measure neck wall thickness! Also you didnt mention anything about your case prep so lets start with this: Think about it - if you have an uneven neck wall like 1.5 to 2 tho diff then when you size the neck you squash the unevenness to the inside while squaring up the neck to the case body via the die. And then you check your neck runout and its now passable of course. But then when you shove a bullet into that tight neck opening it is now not going into an even inside passageway so as a result the case neck is going to get slightly tweaked out of alignment with the case body. As the neck wall thicknesses can vary in a batch of cases you will find uneven runouts for that reason. But beforehand you need to figure out your desired neck tension and use the correct bushing to get what you need based on the neck wall thickness. And you cant do this without having measured the neck walls! I use a redding compet bushing die and get max .0015 runout but normally a tho or under. Redding wouldnt make them and we wouldnt use them if they caused extreme runout by themselves! Once you have the case prep part all dialed in and still get unacceptable runout then can look at other culprits like uneven case neck lube (or not - I dont lube mine just brush them to get rid of any micro crud deposits). Also uneven or not sufficient chamfering after trimming. And then ensuring you have square ends on your neck. Alot of the 'decent' brand neck trimmers dont cut real square. If your neck isnt square then you cant chamfer evenly. I have found the wilson trimmer to work the best for me. If you want to be splitting hairs on measuring runout then small things can make a noticeable diff. But in most instances its the lack of proper case selection and preparation that will make your gauge spike! I dont agree on recommending neck turning as it can create more probs than benefits if you are not careful and very experienced. I dont mess with turning as I only use brass with a max 1 tho neck thickness variation but most of it is .0005 variation. Most real good brass is like this about .0005-.001 difference. I would only neck turn if my necks were that even but too thick to give my preferred bullet tension. I use a coax press which they say helps with runout but I dont believe it when using compet dies. But I prefer that press for other reasons. The #1 tip is what the above guys mentioned about about rotating when seating. I have had some that I measured a bit out of whack and even then put back in the press to straighten by rotating all over again. But the rotating tip isnt going to help much if your brass is not all square and even to start with. Hope this helps. BTW I am not a competitive shooter but some experienced LR shooters have told me that anything 5 tho and under dosent seem to make any big diff in accuracy taking into consideration all the other factors. But I look at runout as just another challenge to master in reloading. I can make consistent ammo much better than I can shoot the stuff! [/QUOTE]
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What's Causing Bullet Runout
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