General Categories > Hunting and Fishing
.223 ft/lbs at 100 yards.. how to calculate?
Les:
Agreed, most use 24" to test fps and calculate for Ft #'s I'd probably use a 62-79 gr. soft point to hunt med game. Should be no problem.
Burnsy87:
Talked to Black Hills (through Facebook, of all things... blown away it worked, and they responded so quickly)
.223 is out of a 24" barrel
5.56 is out of a 20" barrel
According to that website, 5.56 62gr TSX is good to go. I still want to chrono though.
Mali:
--- Quote from: Burnsy87 on November 26, 2016, 08:57:25 PM ---Talked to Black Hills (through Facebook, of all things... blown away it worked, and they responded so quickly)
.223 is out of a 24" barrel
5.56 is out of a 20" barrel
According to that website, 5.56 62gr TSX is good to go. I still want to chrono though.
--- End quote ---
Interesting. Although I am still a neophyte with regard to the difference, I would not have thought they would have a 4" barrel difference. Can anybody with more knowledge explain that to me?
Thank you in advance.
JAK:
My best guess is the difference between military and civilian ammo specifications.
From what I have seen/read the standard length barrel is used to test most civilian/commercial ammo is 24 inches for rifles. This relates to the barrel length of most bolt action hunting rifles.
For military ammunition what is used is the barrel length of the standard service rifle which for years has been the M-16 with a 20 inch barrel. Most of the reloading manuals that list the 5.56 separate from the .223 also state that a AR-15 with a 20 inch barrel was used for testing.
When the military orders ammo, it will specify a bullet weight and velocity for the ammo along with a minimum accuracy level and the weapon it is going to be fired from. I have attached a couple of pages from military manuals that show this.
John K
Mali:
Your explanation certainly makes sense based on what I know from being around the military and friends who get to hunt. Thanks for the info.
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