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Long Range Hunting & Shooting
8 twist 22” 300 Win Mag with 215 Berger Hybrids
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<blockquote data-quote="wildcat455" data-source="post: 1524345" data-attributes="member: 102653"><p>That's always been my experience, thought process, and way I was taught it worked as well, wildrose.</p><p></p><p>I'm not sure how it would serve someone to load a large charge of slow powder in a short barreled rifle to bring up pressure and velocity to the same level attainable with a faster (but still relatively slow) powder in that same short barreled rifle, while spitting a good percentage of the slow powder out of the muzzle unburned. Not very powder efficient, cost efficient, or seemingly wise. </p><p></p><p>Out of curiosity over this, I ran the numbers Using Quick load for reference on powders mentioned using a 20" barrel on a hypothetical 300 win mag.</p><p></p><p>69 grains H4350 gives 2642 fps with a 215 Berger, max pressure 63k and muzzle pressure 14393 psi out of a 20" barrel with a ballistic efficiency of 27%. </p><p>Amount of propellant burned is 99.96%.</p><p></p><p>Conversely it takes 72.5 grains of H4831SC to give 2627 fps with a 215 berger, max pressure 59k and muzzle pressure 15,296 psi out of a 20" barrel with a ballistic efficiency of 24.5% Amount of propellant burned is 98.3%</p><p></p><p>In the extreme case of using H50BMG, it would take 86.5 grains at 12% compression to give 2635 fps with a 215 Berger, max pressure 58k and muzzle pressure is 16,843 psi out of a 20" barrel with a ballistic efficiency of 20%. Amount of propellant burned is 85%.</p><p></p><p>That's about 13 grains of powder going out the end of the barrel unburned, not to mention the waste of using 86.5 grains of H50BMG to do what 69 grains of H4350 will do. That's another 17.5 grains of powder wasted, bringing the total up to 20.5 grains of wasted powder. </p><p></p><p>The reason you're not seeing a large muzzle flash with the slower burning powders in the short barrels is because once that unburned solid powder hits the muzzle, you are extinguishing the flame front. It's not a gas.</p></blockquote><p></p>
[QUOTE="wildcat455, post: 1524345, member: 102653"] That's always been my experience, thought process, and way I was taught it worked as well, wildrose. I'm not sure how it would serve someone to load a large charge of slow powder in a short barreled rifle to bring up pressure and velocity to the same level attainable with a faster (but still relatively slow) powder in that same short barreled rifle, while spitting a good percentage of the slow powder out of the muzzle unburned. Not very powder efficient, cost efficient, or seemingly wise. Out of curiosity over this, I ran the numbers Using Quick load for reference on powders mentioned using a 20" barrel on a hypothetical 300 win mag. 69 grains H4350 gives 2642 fps with a 215 Berger, max pressure 63k and muzzle pressure 14393 psi out of a 20" barrel with a ballistic efficiency of 27%. Amount of propellant burned is 99.96%. Conversely it takes 72.5 grains of H4831SC to give 2627 fps with a 215 berger, max pressure 59k and muzzle pressure 15,296 psi out of a 20" barrel with a ballistic efficiency of 24.5% Amount of propellant burned is 98.3% In the extreme case of using H50BMG, it would take 86.5 grains at 12% compression to give 2635 fps with a 215 Berger, max pressure 58k and muzzle pressure is 16,843 psi out of a 20" barrel with a ballistic efficiency of 20%. Amount of propellant burned is 85%. That's about 13 grains of powder going out the end of the barrel unburned, not to mention the waste of using 86.5 grains of H50BMG to do what 69 grains of H4350 will do. That's another 17.5 grains of powder wasted, bringing the total up to 20.5 grains of wasted powder. The reason you're not seeing a large muzzle flash with the slower burning powders in the short barrels is because once that unburned solid powder hits the muzzle, you are extinguishing the flame front. It's not a gas. [/QUOTE]
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8 twist 22” 300 Win Mag with 215 Berger Hybrids
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