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Rifles, Reloading, Optics, Equipment
Reloading
Primers
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<blockquote data-quote="Nimrodmar10" data-source="post: 642736" data-attributes="member: 36369"><p>The type of primer you use is very often effected by the type powder you use. Like I said in my post, the use of ball-type powders, such as H-380, H-870, Win. 748, 760 and many more may be more accurate using magnum primers . All ball powders are double based powders <span style="font-size: 10px">and in general, are harder to ignite than extruded powder, therefore magnum primers are recommended in certain loads.</span></p><p> </p><p><span style="font-size: 10px">There is no "Magic" rule when selecting regular or magnum primers. The smaller the primer charge in a primer the more uniform it will be, to a point. That is the reason most BR calibers have historically been fired by small rifle primers. Remington even went so far as to manufacture their BR case, which is a .308 Winchester with a small primer pocket. This universal case evolved into several very good BR calibers. However, under some reloading conditions, such as ball powders or large volumns of powder, a magnum primer will give more uniform ignition resulting in better accuracy.</span></p><p> </p><p><span style="font-size: 10px">The new generation of high velocity calibers such as the Ultra Mags very often will suffer from hang fires in small-for-case-capacity bullet diameters when using long grain extruded powders. I've heard suggestions that this may be caused by the grains of powder bridging the case neck, causing the hang fires. Some of our early reloading pioneers even tried to overcome this problem by building ignition tubes into the case to move the primer fire more toward the front of the case so that the powder would burn from front to back. I presonally had a Remington Sendero in 7mm RUM, that when loaded with max loads of long extruded powder, would do this. The hang fire was only fractions of a second, but was very disconcerting. A move to the Federal 215M primer solved the problem.</span></p><p> </p><p><span style="font-size: 10px">In general, you should use the primer with the least amount of power which give you consistent ignition resulting in lower extreme spread and best accuracy. You will need to try more than one primer to see which one works the best.</span></p></blockquote><p></p>
[QUOTE="Nimrodmar10, post: 642736, member: 36369"] The type of primer you use is very often effected by the type powder you use. Like I said in my post, the use of ball-type powders, such as H-380, H-870, Win. 748, 760 and many more may be more accurate using magnum primers . All ball powders are double based powders [SIZE=2]and in general, are harder to ignite than extruded powder, therefore magnum primers are recommended in certain loads.[/SIZE] [SIZE=2]There is no "Magic" rule when selecting regular or magnum primers. The smaller the primer charge in a primer the more uniform it will be, to a point. That is the reason most BR calibers have historically been fired by small rifle primers. Remington even went so far as to manufacture their BR case, which is a .308 Winchester with a small primer pocket. This universal case evolved into several very good BR calibers. However, under some reloading conditions, such as ball powders or large volumns of powder, a magnum primer will give more uniform ignition resulting in better accuracy.[/SIZE] [SIZE=2]The new generation of high velocity calibers such as the Ultra Mags very often will suffer from hang fires in small-for-case-capacity bullet diameters when using long grain extruded powders. I've heard suggestions that this may be caused by the grains of powder bridging the case neck, causing the hang fires. Some of our early reloading pioneers even tried to overcome this problem by building ignition tubes into the case to move the primer fire more toward the front of the case so that the powder would burn from front to back. I presonally had a Remington Sendero in 7mm RUM, that when loaded with max loads of long extruded powder, would do this. The hang fire was only fractions of a second, but was very disconcerting. A move to the Federal 215M primer solved the problem.[/SIZE] [SIZE=2]In general, you should use the primer with the least amount of power which give you consistent ignition resulting in lower extreme spread and best accuracy. You will need to try more than one primer to see which one works the best.[/SIZE] [/QUOTE]
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