.223 ft/lbs at 100 yards.. how to calculate?

[Burnsy87]

Fair enough.  I just would prefer 70gr.

[SS_N_NE]

Since the Ft/Lb @ 100 yards is generally a hunting requirement in NE. I am going to ask...how does the DNR decide?

For instance...you are hunting with your AR....stopped by DNR...you show them the box your ammo came from...how do they deside you have the proper ammo to make the foot/pounds?

[Burnsy87]

^ Yeah that's a good question

[tstuart34]

I would say you wouldn't get picked up for this unless your have a mall cop dnr guy or they are stacking charges on you.....

If they wanted to question your loads they would have to do the same method as we are disscusing. Set a crono have you shoot through it and calculate it out. There are way to many variables just base things off of calculations of boxed ammo. Barrel material, rifling, and coatings all make a difference in velocity. 

[SS_N_NE]

If they wanted to question your loads they would have to do the same method as we are disscusing.

That is basically what I was referring to with my questions. The DNR sets a regulation, but doesn't specify the method of verification. Most likely you could be charged and would have the burden of proof in your defense.  A classic case of too much law.

[jonm]

That is basically what I was referring to with my questions. The DNR sets a regulation, but doesn't specify the method of verification. Most likely you could be charged and would have the burden of proof in your defense.  A classic case of too much law.

That's a lot of speculation.

[SS_N_NE]

That's a lot of speculation.

Can you show me how the DNR determines the ft/lb requirement is met in any given circumstance?

[jonm]

I cannot. That's why Im not speculating.

[RobertH]

has anyone emailed or called them yet to find out?  im pretty sure they will be open tomorrow.

[OnTheFly]

It looks like a job for "My Personal Radar".

http://mylabradar.com



Never have to set the chrono up, shoot at it (or in some cases actually shoot it), and then tear it down.  Get the muzzle velocity at any distance up to 100 yards.  Day, night, indoor, or outside. 

Fly

[tstuart34]

has anyone emailed or called them yet to find out?  im pretty sure they will be open tomorrow.

Just called NG&P and spoke with the law enforcement division. They said they DO NOT travel with cornos and as far as the gentlemen knew it would be handled on a case by case bases. He said he has never had encounter with a officer questioning the FT/LB reg. He said most of the time the specification is used to insure that people are using the proper caliber. 

[RobertH]

Just called NG&P and spoke with the law enforcement division. They said they DO NOT travel with cornos and as far as the gentlemen knew it would be handled on a case by case bases. He said he has never had encounter with a officer questioning the FT/LB reg. He said most of the time the specification is used to insure that people are using the proper caliber. 

thanks.  i was going to call, but forgot.  i figured as much.

[Burnsy87]

Bringing back from the dead, sorry admin/mods.

Came across https://billstclair.com/energy.html today.  Can anybody find serious discrepancies with the formula?

[Les]

Bringing back from the dead, sorry admin/mods.

Came across https://billstclair.com/energy.html today.  Can anybody find serious discrepancies with the formula?
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[Burnsy87]

Just screwing around.  Took 200 fps off, though that's not accurate, I don't know what Black Hills uses for a barrel length for their printed FPS.  But it gave me the required energy at 100, so I'm assuming it's a 24" barrel instead of 20" they use that I assumed.

[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]

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.

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.