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Rifles, Reloading, Optics, Equipment
Reloading
Large rifle primers
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<blockquote data-quote="MagnumManiac" data-source="post: 2778916" data-attributes="member: 10755"><p>This depends on chamber dimensions.</p><p>My cartridge in question has a longer neck and .005" taper per inch. It mirrors an AI with slightly less body taper, typical AI designs have .010" taper per inch.</p><p>Seeing as though my chamber holds the flame front inside the case longer, it is very efficient and produces high velocities at lower pressures than my previous attempt that had more taper per inch and the shoulder was back a bit more.</p><p>A magnum primer just isn't necessary even with 121gr of ball powder.</p><p>I have pressure testing equipment, so I am not guessing here, start pressure is high, which gives gentler rise to max pressure and a hot primer changes this fact too much. Without testing this, you just would never know.</p><p>Have said this before, a magnum primer is NOT necessary to ignite large amounts of powder….it was designed and asked for by Roy Weatherby to dampen the hangfires he was getting when designing and playing with REDUCED loads in the 378 Weatherby.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2778916, member: 10755"] This depends on chamber dimensions. My cartridge in question has a longer neck and .005” taper per inch. It mirrors an AI with slightly less body taper, typical AI designs have .010” taper per inch. Seeing as though my chamber holds the flame front inside the case longer, it is very efficient and produces high velocities at lower pressures than my previous attempt that had more taper per inch and the shoulder was back a bit more. A magnum primer just isn’t necessary even with 121gr of ball powder. I have pressure testing equipment, so I am not guessing here, start pressure is high, which gives gentler rise to max pressure and a hot primer changes this fact too much. Without testing this, you just would never know. Have said this before, a magnum primer is NOT necessary to ignite large amounts of powder….it was designed and asked for by Roy Weatherby to dampen the hangfires he was getting when designing and playing with REDUCED loads in the 378 Weatherby. Cheers. [/QUOTE]
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Large rifle primers
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