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smokey447
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Posted: February 07 2017 at 5:34pm | IP Logged Quote smokey447

OK.....I'm re-loading for the AR15 type rifle....ordering some FMJ Match Grade boat-tails.... regarding the diameter to order from the catalog, is the correct diameter ".223" or ".224"? They list both . Other than .001" whats the difference between the two???? Can I use either or is one a taboo? My barrel has a 1 in 7 twist.
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richhodg66
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Posted: February 07 2017 at 7:35pm | IP Logged Quote richhodg66

You need .224. All modern .22 centerfires are .224 diameter. The only thing I know that used .223 diameter bullets are pre-WWII .22 Hornets.

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RT58
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Posted: February 08 2017 at 7:34am | IP Logged Quote RT58

I believe the .22 Jet takes .223 dia. also.

But anyway, Flat based bullets bases will expand to fill the bore with no problem, but boat-tails don't, so you might get a little less pressure and velocity. The noses won't expand either and could cause a noticeable loss of accuracy by yawing. I'm sure the guys at our local range wouldn't notice, but if your looking for match grade accuracy stick with the .224s. The fast twist of your barrel is intended for heavier bullets so again, if you are looking for match accuracy make sure the bullets you are buying are intended for that rate of twist.
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smokey447
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Posted: February 08 2017 at 12:44pm | IP Logged Quote smokey447

OK....thanks Guys! .224 it is!
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joed
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Posted: February 09 2017 at 6:53am | IP Logged Quote joed

For good accuracy it's important that you match the weight of the bullets to
the twist.    My AR has a 1:7 twist and shoots 55 gr bullets mediocre.   So far
the lightest bullets I've found that give good accuracy in my gun are 69 gr.

Some with fast twists have said they still get good accuracy with light bullets,
my observations haven't shown that.   One 5.56 rifle I owned with a 1:9 twist
wouldn't shoot 50 or 55 gr with great accuracy either.   

You'll have to see how it handles different bullets to see what it likes.

      



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