Jake1996,
Are you aware that ARs shooting .223 ammunition are competed with in matches and that this type of rifle is dominant these days? Also understand that ARs shooting .223 are commonly shot out to 600 yards, well within your criteria.
Many types of ammunition can be considered the "best" at 400 yards because "best" has different criteria, economy and accuracy and wear on equipment being some of them. What is "best" for someone with an unlimited budget for ammunition and firearms isn't the same as someone without that budget and what is "best" for someone that can load their own is different from someone that only purchases factory ammunition. With all that said the .223 will certainly perform reasonably at the range you're interested in with many different sources of factory as well as hand load ammunition while putting minimum stress on your firearm, either semi or bolt. That versatility can be considered a good "best" criteria as well.
Take a look at this thread - http://thehighroad.org/showthread.php?p=2190792
Are you aware that ARs shooting .223 ammunition are competed with in matches and that this type of rifle is dominant these days? Also understand that ARs shooting .223 are commonly shot out to 600 yards, well within your criteria.
Many types of ammunition can be considered the "best" at 400 yards because "best" has different criteria, economy and accuracy and wear on equipment being some of them. What is "best" for someone with an unlimited budget for ammunition and firearms isn't the same as someone without that budget and what is "best" for someone that can load their own is different from someone that only purchases factory ammunition. With all that said the .223 will certainly perform reasonably at the range you're interested in with many different sources of factory as well as hand load ammunition while putting minimum stress on your firearm, either semi or bolt. That versatility can be considered a good "best" criteria as well.
Take a look at this thread - http://thehighroad.org/showthread.php?p=2190792
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