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Rifles, Reloading, Optics, Equipment
Reloading
Need some help figuring this out
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<blockquote data-quote="jeepinfool1978" data-source="post: 1370480" data-attributes="member: 94385"><p>Would air density due to a lower temp and likely higher humidity do it? Maybe the rounds were warmer this time causing a fast burn rate? (I know that sounds crazy but think about having your ammo on the floor board of your car with the AC on in the summer vs heat now). I read this post this morning and contemplated it at the range while firing a 6.5cm load with H4350 that I developed this summer at 83 degrees and 17% humidity, No issues. Today I had several heavy bolt lifts at 29 degrees and 67% humidity. I am always careful to transport my ammo in a location in the vehicle that is out of direct sun as well AC or heat so I am pretty sure it has to be the atmospherics making the air in the bore "thicker" thus creating more resistance to get the bullet moving and driving up pressure. I know everyone always expects to see more pressure at higher temps and I do believe that's typically the case but if your ammo temp is the same (you mentioned it was your first round so I am assuming you store your ammo between 60-70degrees year round) then the environment would be the only thing that could drive up the pressure.</p></blockquote><p></p>
[QUOTE="jeepinfool1978, post: 1370480, member: 94385"] Would air density due to a lower temp and likely higher humidity do it? Maybe the rounds were warmer this time causing a fast burn rate? (I know that sounds crazy but think about having your ammo on the floor board of your car with the AC on in the summer vs heat now). I read this post this morning and contemplated it at the range while firing a 6.5cm load with H4350 that I developed this summer at 83 degrees and 17% humidity, No issues. Today I had several heavy bolt lifts at 29 degrees and 67% humidity. I am always careful to transport my ammo in a location in the vehicle that is out of direct sun as well AC or heat so I am pretty sure it has to be the atmospherics making the air in the bore “thicker” thus creating more resistance to get the bullet moving and driving up pressure. I know everyone always expects to see more pressure at higher temps and I do believe that’s typically the case but if your ammo temp is the same (you mentioned it was your first round so I am assuming you store your ammo between 60-70degrees year round) then the environment would be the only thing that could drive up the pressure. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Need some help figuring this out
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