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The Range
NFA & Class III Discussion
10.5” 5.56 SBR Ammo Recommendations
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<blockquote data-quote="TulsaMike" data-source="post: 3684190" data-attributes="member: 49625"><p>Daniel defense barrels are very fast, but not all barrels are equal. I’ve seen a 150 fps swing with the same barrel length and different manufacturers. Regardless, good data, but I will still take velocity over weight. There is a lot more to the science behind it than just numbers. In a longer barrel, such as 14.5 and higher, I like heavier rounds. If you’ve used ballistic calculators and actually shoot long range, you also know the bc changes at lower velocities. Most people running a 10.5 or shorter don’t typically tend to shoot past 200 yards, but never the less, losing velocity loses a lot, and there are better rounds with a happy medium. Much of why my agency with 70 gr is because while not really optimal for any length, it works well on all lengths. Others went with 62-64 gr, which has been proven time and time again to be the best for short barrels, especially since most soft points in that range were developed for law enforcement. If you want a similar comparison, many are using 147 gr 9mm today because the fbi said it’s the best. Most testing was done in the Glock 17 for its abilities, and it’s silly to use that round in shorter 3 inch barrels that many carry for self defense due to the velocity loss. Weight alone doesn’t make it superior, and the rounds are designed to function within a certain velocity range to operate properly. In the end, enough hits from anything does the job, but more often than not, velocity is what kills, best so when properly matched to a weight that benefits it most.</p></blockquote><p></p>
[QUOTE="TulsaMike, post: 3684190, member: 49625"] Daniel defense barrels are very fast, but not all barrels are equal. I’ve seen a 150 fps swing with the same barrel length and different manufacturers. Regardless, good data, but I will still take velocity over weight. There is a lot more to the science behind it than just numbers. In a longer barrel, such as 14.5 and higher, I like heavier rounds. If you’ve used ballistic calculators and actually shoot long range, you also know the bc changes at lower velocities. Most people running a 10.5 or shorter don’t typically tend to shoot past 200 yards, but never the less, losing velocity loses a lot, and there are better rounds with a happy medium. Much of why my agency with 70 gr is because while not really optimal for any length, it works well on all lengths. Others went with 62-64 gr, which has been proven time and time again to be the best for short barrels, especially since most soft points in that range were developed for law enforcement. If you want a similar comparison, many are using 147 gr 9mm today because the fbi said it’s the best. Most testing was done in the Glock 17 for its abilities, and it’s silly to use that round in shorter 3 inch barrels that many carry for self defense due to the velocity loss. Weight alone doesn’t make it superior, and the rounds are designed to function within a certain velocity range to operate properly. In the end, enough hits from anything does the job, but more often than not, velocity is what kills, best so when properly matched to a weight that benefits it most. [/QUOTE]
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