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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 Norma Mag (Standard Version)
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<blockquote data-quote="tim_w" data-source="post: 2648219" data-attributes="member: 11132"><p>Frankly, I find, if you want the most stable cases and consistent load development always do a first loading in virgin brass as a fireform load using a med pressure load. If you subscribe to that it's no extra work to fireform to a sharper shoulder and less body taper. Why not then get the added benefits of the changes. If improvements are kept moderate, in a bolt gun, IMO, there are no downsides in terms of function or performance. </p><p></p><p>Neck growth for a given shoulder angle is tied to the peak chamber pressure of the load you run. Also if you anneal vs not can effect this. I subscribe to annealing every firing or not at all.</p><p></p><p>Even 33-35° will reduce neck growth. Add a bit of reduction in case body taper and the combo allows cases to last longer at a given pressure. It decreases over all brass flow. There is a reason it's called "improved" after all.</p><p></p><p>With the cost these days of these large cases like the NM/LM I do not want 10 loads I want 30+ loadings. 50 cases should outlast the barrel.</p><p></p><p>My favs 300 NM Imp designs which have proved to be wickedly accurate, easy to tune with multiple powders and bullets, has dies instock and available are:</p><p>[USER=101859]@Alex Wheeler[/USER] 300NM Wheeler and [USER=20643]@rpierce[/USER] Ryan Pierce's 300NM Pierce.</p><p></p><p>There are numerous guns in the wild with those chambers over a stretch of years now so any bugs have been throughly worked out.</p></blockquote><p></p>
[QUOTE="tim_w, post: 2648219, member: 11132"] Frankly, I find, if you want the most stable cases and consistent load development always do a first loading in virgin brass as a fireform load using a med pressure load. If you subscribe to that it's no extra work to fireform to a sharper shoulder and less body taper. Why not then get the added benefits of the changes. If improvements are kept moderate, in a bolt gun, IMO, there are no downsides in terms of function or performance. Neck growth for a given shoulder angle is tied to the peak chamber pressure of the load you run. Also if you anneal vs not can effect this. I subscribe to annealing every firing or not at all. Even 33-35° will reduce neck growth. Add a bit of reduction in case body taper and the combo allows cases to last longer at a given pressure. It decreases over all brass flow. There is a reason it's called "improved" after all. With the cost these days of these large cases like the NM/LM I do not want 10 loads I want 30+ loadings. 50 cases should outlast the barrel. My favs 300 NM Imp designs which have proved to be wickedly accurate, easy to tune with multiple powders and bullets, has dies instock and available are: [USER=101859]@Alex Wheeler[/USER] 300NM Wheeler and [USER=20643]@rpierce[/USER] Ryan Pierce's 300NM Pierce. There are numerous guns in the wild with those chambers over a stretch of years now so any bugs have been throughly worked out. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 Norma Mag (Standard Version)
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