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Old August 31, 2008, 06:11 PM   #1
SLOMountaineer
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.224 80gr for AR-15 or .22-250?

I happen to have two boxes of Sierra MK 80gr. The COL is listed at 2.550. However, that won't fit into an AR-15 magazine...in fact, it isn't even close. Will seating it deeper than normal create any dangerous pressure situations? I have a Remington 700 which I assume has a 1:14" twist which won't cut it.

Any suggestions?
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Old August 31, 2008, 06:49 PM   #2
hodaka
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If your AR is 8 twist or tighter it may shoot them well. You will need to seat them long and single load them. Forget about seating them mag length.
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Old August 31, 2008, 08:25 PM   #3
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As above, if you have a 1:7" twist, you may be able to seat them and fire them, but they will not feed through the magazine. Most 22-250s have a 1:14" twist and will not stabilize bullets over 55-60 gr.
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Old August 31, 2008, 09:15 PM   #4
Loader9
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Sierra says you need a 1:7" or 1:8" twist barrel. I would assume that the reason for seating it out so far is that with the bullet seated to "normal" depth, there isn't enough room left in the case for an adequate charge of powder. I don't think I would try to seat them any deeper especially if you are using a ball type powder. Here's Sierras loading data on it in case you don't have it:
http://accurateshooter.net/Downloads/sierra223ar.pdf
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Old August 31, 2008, 09:47 PM   #5
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I shoot the SMK 80s in my WOA upper at 600 and 1000 yards. They are single loaded with is required for slow fire in High Power. They are too long to load to fit the mag. Use 77s there. And yes the 1 in 7 is the right twist or the 80s.
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Old August 31, 2008, 11:49 PM   #6
SLOMountaineer
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Thanks all. I knew I came to the right place for my questions.
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