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Rifles, Reloading, Optics, Equipment
Reloading
243 ai crush fit issue
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<blockquote data-quote="MNbogboy" data-source="post: 942781" data-attributes="member: 18849"><p>I totally agree with your assumptions...The chances of you getting two batches of brass totally out of SAAMI spec would be a rare thing.....And the case trim of course has nothing to do with the crush fit (the crush fit happens at the junction of the shoulder and neck).....If a primer backed out .019 then this is a very unsafe condition...That is why the crush fit was built into the AIs (usually about .004) in the first place is to hold the cartridge head back against the bolt face, if the cartridge slides forward as I believe yours is doing it not only can cause the misfires but also the protruding primers which now have a better chance of rupturing!.....The false shoulder and deep seating methods can prevent this during fire forming but your option of using factory ammo (in a pinch) is now out...If you have had good luck with your smith he will most likely see the error and correct.... </p><p> </p><p>A check with a .243 go gage should be a no go in the AI chamber....The smith may have received an errant or mislabeled gauge...</p><p> </p><p>Good Luck,</p><p>Randy</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 942781, member: 18849"] I totally agree with your assumptions...The chances of you getting two batches of brass totally out of SAAMI spec would be a rare thing.....And the case trim of course has nothing to do with the crush fit (the crush fit happens at the junction of the shoulder and neck).....If a primer backed out .019 then this is a very unsafe condition...That is why the crush fit was built into the AIs (usually about .004) in the first place is to hold the cartridge head back against the bolt face, if the cartridge slides forward as I believe yours is doing it not only can cause the misfires but also the protruding primers which now have a better chance of rupturing!.....The false shoulder and deep seating methods can prevent this during fire forming but your option of using factory ammo (in a pinch) is now out...If you have had good luck with your smith he will most likely see the error and correct.... A check with a .243 go gage should be a no go in the AI chamber....The smith may have received an errant or mislabeled gauge... Good Luck, Randy [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
243 ai crush fit issue
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