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Posted: 7/23/2009 9:09:57 PM EDT
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Is it correct that I do not need a neck sizing die to reload .224 for an AR15? So I will only need full body and seating die? Thanks in advanced for any help 
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| semi auto guns are liable to jam if cases are not full length resized. Bolt guns "cam over" on loading and can chamber cases that are just neck sized. Some factory stuff is crimped. Military stuff usually is. I only crimp high power loads (like 44 magnum) because the recoil can actually slide the bullet from the other unfired cartridges. In an AR there really is no "recoil" due to the buffer spring/design so I dont worry about it. Others do. |
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Quoted:
Thanks for the responses! What are the advantages/disadvantages of using a crimp die? Does factory loaded ammo come crimp t? Also why is there no requirement for a neck sizing die? Cases for an autoloader need a little room in the chamber for good function. Many of us use an adjustable gage for measuring cartridge head space; this is not the same as "firearm headspace", although they are related. A conventional full length sizer die is used to push the shoulder of the fired case back about 0.002 inches to provide this room between the case and the inside of the chamber. Neck sizing does not touch the shoulder. The usual bolt gun can chamber and extract these neck sized cases with ease, although I would recommend full length sizing anyway if the bolt has to be operated quickly. Neck sizing can provide an accuracy edge. Maybe. Some precision shooters have abandoned the practice. |
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Quoted:
Thanks for the responses! What are the advantages/disadvantages of using a crimp die? Does factory loaded ammo come crimp t? I crimp or not crimp depending on the bullet I'm loading. With 55 and 62 gr FMJBT's, I seat bullets to mid cannelure and crimp lightly with a Lee FCD (Factory crimp Die). The FCD is the third die used. The seater/crimp die (second die) is adjusted to seat only. With bullets with no cannelure ,bullets are seated with second die (remember it was adjusted to not crimp). FCD not used for match bullets/loads. Also why is there no requirement for a neck sizing die? Neck sizing is a technique used with bolt action rifles. Not for semi auto rifles. |
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For further clarification on neck sizing. The full length die sizes the neck and the body of the case. You're not missing out on neck sizing there.
The neck sizing die forms only the neck, which allows the case to retain its pressure-formed fit to the the rifle chamber. This kind of fit is not good for the rapid action of autoloaders and may contribute to misfeeds or jams. |
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