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Rifles, Reloading, Optics, Equipment
Reloading
Belted Magnum questions for you guys..
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<blockquote data-quote="MagnumManiac" data-source="post: 616853" data-attributes="member: 10755"><p>You need a mild load of a medium burning rate powder for a fireforming load, RE25 is way too slow for this. Something in the range of H4198 with a 125gr/130gr projectile and a starting load.</p><p></p><p>The reason I recommend a fireforming load is that it will stretch the shoulder back to chamber specs without overly stressing the area above the web of the case, this is where any stretching will take place due to the excessive shoulder headspace.</p><p>In this instance, you want mild pressures to stretch the shoulder, or you will get incipient case head separations within a couple of firings.</p><p></p><p>I know this is technical, but a fire forming load without a projectile is what I recommend. </p><p>If you can get your hands on some fast pistol powder, such as Clays or red dot, and use just enough to blow the shoulders forward, you'll have to experiment with the charge weight, then you should be good to go. To form a case, I use Clays. </p><p></p><p>Now my 375Weatherby takes 30gr's to give full rounded shoulders, this is probably too much for a 300WM case. I would try 15-20gr as a starting point, and increase in 5gr increments until the case shoulder is sharply defined and measures .0075" longer. There is no risk of an overload, no projectile is engaging the rifling!</p><p></p><p>This is the part you will probably get a giggle out of!</p><p></p><p>Once you have loaded your cases, push an appropriately sized piece of pumpkin or potato, for neck length, into the case mouth and fire at the ground or downrange. Sometimes a little molten candle wax dripped over the pumpkin/potato helps to get slightly higher pressures, but is not totally necessary.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 616853, member: 10755"] You need a mild load of a medium burning rate powder for a fireforming load, RE25 is way too slow for this. Something in the range of H4198 with a 125gr/130gr projectile and a starting load. The reason I recommend a fireforming load is that it will stretch the shoulder back to chamber specs without overly stressing the area above the web of the case, this is where any stretching will take place due to the excessive shoulder headspace. In this instance, you want mild pressures to stretch the shoulder, or you will get incipient case head separations within a couple of firings. I know this is technical, but a fire forming load without a projectile is what I recommend. If you can get your hands on some fast pistol powder, such as Clays or red dot, and use just enough to blow the shoulders forward, you'll have to experiment with the charge weight, then you should be good to go. To form a case, I use Clays. Now my 375Weatherby takes 30gr's to give full rounded shoulders, this is probably too much for a 300WM case. I would try 15-20gr as a starting point, and increase in 5gr increments until the case shoulder is sharply defined and measures .0075" longer. There is no risk of an overload, no projectile is engaging the rifling! This is the part you will probably get a giggle out of! Once you have loaded your cases, push an appropriately sized piece of pumpkin or potato, for neck length, into the case mouth and fire at the ground or downrange. Sometimes a little molten candle wax dripped over the pumpkin/potato helps to get slightly higher pressures, but is not totally necessary. [/QUOTE]
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Belted Magnum questions for you guys..
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