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Rifles, Reloading, Optics, Equipment
Reloading
Velocity & Pressure Spike
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<blockquote data-quote="orch" data-source="post: 1303835" data-attributes="member: 35688"><p>I have to agree with what Mike is saying...</p><p></p><p>If the virgin brass is quite undersized compared to the chamber, the brass expanding to fit the chamber will absorb some of the energy from the expanding gas and reduce the amount of energy driving the bullet forward and sort of acts like a pressure buffer...</p><p></p><p>the next time you use the fireformed brass that fits tight in the chamber the brass doesn't have any room to expand and absorb energy and there is more energy to drive the bullet hence the higher speed....</p><p></p><p>i have seen the same sort of thing in my 2506ai, had some weak fire forming loads that left me with only partially fireformed cases without the shoulders pushed out all the way, loaded them up with my regular load and fired them along side properly formed brass from the same lot and they always shot 50-100fps slower, after they were properly formed they shot exactly the same as the brass that formed right the first time...</p><p></p><p>Orch</p></blockquote><p></p>
[QUOTE="orch, post: 1303835, member: 35688"] I have to agree with what Mike is saying... If the virgin brass is quite undersized compared to the chamber, the brass expanding to fit the chamber will absorb some of the energy from the expanding gas and reduce the amount of energy driving the bullet forward and sort of acts like a pressure buffer... the next time you use the fireformed brass that fits tight in the chamber the brass doesn't have any room to expand and absorb energy and there is more energy to drive the bullet hence the higher speed.... i have seen the same sort of thing in my 2506ai, had some weak fire forming loads that left me with only partially fireformed cases without the shoulders pushed out all the way, loaded them up with my regular load and fired them along side properly formed brass from the same lot and they always shot 50-100fps slower, after they were properly formed they shot exactly the same as the brass that formed right the first time... Orch [/QUOTE]
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Velocity & Pressure Spike
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