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Rifles, Reloading, Optics, Equipment
Reloading
Redding bushing die
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<blockquote data-quote="dok7mm" data-source="post: 1148256" data-attributes="member: 90080"><p>RustyRick, you will find differences in fired neck diameters, even with neck turned brass, due to varying brass spring back. That being said, you will have far better results at longer ranges with uniform neck tension. This can be enhanced by sorting your brass by measuring neck thickness with a ball micrometer or turning case necks to a uniform thickness. A regular annealing schedule will also help you keep consistent neck tension. I'm not sure you are ready to go this far down the rabbit hole with your loading. To answer your original question, you need a .305" bushing for .002" neck tension if your measurements are correct. It also appears your chamber neck is around .315" or .316" , again if your measurements are correct. SO, you are going to be reducing your FIRED neck diameter down to .305" or roughly .010" total reduction. You cannot reduce this far with 1 bushing and expect to get any kind of consistent neck tension from shot to shot. This is a fairly common problem with larger factory chamber necks. To get consistent reductions, you simply have to use two (or possibly three) bushings to get to your final neck size. In this case, first a .310" and last your .305" bushing. It's a PITA, but will give better results than doing it in one step. I use only Redding Comp dies and have had excellent results, but I'm running tighter necked chambers than you. IF, your final sized necks measure .305" consistently, you are good to go, depending on your accuracy requirements. THEN, to improve at longer ranges, there's always more needed. Good luck!</p></blockquote><p></p>
[QUOTE="dok7mm, post: 1148256, member: 90080"] RustyRick, you will find differences in fired neck diameters, even with neck turned brass, due to varying brass spring back. That being said, you will have far better results at longer ranges with uniform neck tension. This can be enhanced by sorting your brass by measuring neck thickness with a ball micrometer or turning case necks to a uniform thickness. A regular annealing schedule will also help you keep consistent neck tension. I'm not sure you are ready to go this far down the rabbit hole with your loading. To answer your original question, you need a .305" bushing for .002" neck tension if your measurements are correct. It also appears your chamber neck is around .315" or .316" , again if your measurements are correct. SO, you are going to be reducing your FIRED neck diameter down to .305" or roughly .010" total reduction. You cannot reduce this far with 1 bushing and expect to get any kind of consistent neck tension from shot to shot. This is a fairly common problem with larger factory chamber necks. To get consistent reductions, you simply have to use two (or possibly three) bushings to get to your final neck size. In this case, first a .310" and last your .305" bushing. It's a PITA, but will give better results than doing it in one step. I use only Redding Comp dies and have had excellent results, but I'm running tighter necked chambers than you. IF, your final sized necks measure .305" consistently, you are good to go, depending on your accuracy requirements. THEN, to improve at longer ranges, there's always more needed. Good luck! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Redding bushing die
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