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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
6mm Creedmoor gas gun
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<blockquote data-quote="budlight" data-source="post: 2560110" data-attributes="member: 2939"><p>That is not how rifles work. right after the primer is set of it ignites the powder. You have several items that determine max pressure achieved. Max pressure is achieved in the first few inches of bullet travel down the barrel. Slower powder is slightly farther down the barrel.</p><p></p><p>But anyway if you drilled a holes every couple inches starting at 6 inches clear down the barrel and put pressure sensors. You are going to see a decrease in pressure with distance even before the bullet leaves the barrel. </p><p></p><p></p><p>The reason is as the bullet travels the volume of the tube increases lowering pressure along with the gases cooling. </p><p></p><p> Well anyway you can read up on 3 gas tube lenghts VS pressure. In a 5.56 the carbine length hole gets hit with 30,000 psi mid length was 18,000, and rifle length was clear down to 13,000. Or something along those lines of pressure. So + two inches the pressure is even lower. All my builds are rifle length at a minimum with small gas port holes. You also get higher FPS because you are not bleeding off so much pressure</p><p></p><p>I previously posted a chart from a barrel manufacturer about the sizes of gas port holes. A smaller hole way down the barrel eliminated the need for even adjustable gas blocks. I have multi AR's with non adjustable gas blocks and just tune them with the spring and buffer weight.</p></blockquote><p></p>
[QUOTE="budlight, post: 2560110, member: 2939"] That is not how rifles work. right after the primer is set of it ignites the powder. You have several items that determine max pressure achieved. Max pressure is achieved in the first few inches of bullet travel down the barrel. Slower powder is slightly farther down the barrel. But anyway if you drilled a holes every couple inches starting at 6 inches clear down the barrel and put pressure sensors. You are going to see a decrease in pressure with distance even before the bullet leaves the barrel. The reason is as the bullet travels the volume of the tube increases lowering pressure along with the gases cooling. Well anyway you can read up on 3 gas tube lenghts VS pressure. In a 5.56 the carbine length hole gets hit with 30,000 psi mid length was 18,000, and rifle length was clear down to 13,000. Or something along those lines of pressure. So + two inches the pressure is even lower. All my builds are rifle length at a minimum with small gas port holes. You also get higher FPS because you are not bleeding off so much pressure I previously posted a chart from a barrel manufacturer about the sizes of gas port holes. A smaller hole way down the barrel eliminated the need for even adjustable gas blocks. I have multi AR's with non adjustable gas blocks and just tune them with the spring and buffer weight. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
6mm Creedmoor gas gun
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