The Firing Line Forums Is it possible to meet the legal energy demands?
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 September 1, 2010, 12:55 PM #1 Visaman Senior Member   Join Date: November 10, 2008 Location: Norway Posts: 302 Is it possible to meet the legal energy demands? 1) for bullets with a weight between 138.9 grains and 154 grains the minimum legal energy is 2700 joules ( 1991.4 foot pounds per feet) at 100 meters E100 2) with bullets weighting minimum 154 grains, the minimum legal energy is 2200 joules ( 1622.6 foot pounds per feet) at 100 meters. E100 Is it possible to meet these energy demands with any of the cartridges listed, using REAL black-powder charges ? The black powder cartridges: .40-90 .40-100 .44-77 Sharps .44-77 Remington .44-90 .44-100 .44-105 Sharps (Necked) .44-90 Remington .45-70 government .45-82 .45-90 .45-100 .45-110 . .45-120 .50-100 .50-110 .50-140 Sharps .450 Black Powder Express .461 (.450) Gibbs .500 BPE ( 440 grains bullet ,580 m/s) .577 Express __________________ Summa pia gratia nostra conservando corpora et cutodita, de gente fera Normannica nos libera, quae nostra vastat, Deus, regna.
 September 1, 2010, 01:43 PM #2 Scorch Senior Member   Join Date: February 13, 2006 Location: Washington state Posts: 12,121 Visaman, you asked a similar question several weeks ago. The answer is that in order to meet the 1,662 ft-lbs energy requirements with a 154 gr projectile, you must propel it at approximately 2,200 fps. This is because kinetic energy is calculated 1/2 Mass X Velocity squared 1/2 Mass= 77 grains / 7000 grains/pound / 32 ft/sec/sec (acceleration of Gravity- required to convert weight units to Mass units) You can see that with a 154 gr bullet, you must achieve approximately 2,200 fps velocity in order for the equation to be satisfied. This is easily achievable. A 7X57 can do it, easily. A 30-30 can do it, easily. As far as black powder cartridges, they pretty much max out at 1,500 fps due to the limitiations of BP as a propellant. 1,300 fps is more common. In order for BP cartridges to achieve a target energy threshold, and being limited to lower velocities, they achieve the target energy by increasing bullet weight. Assuming 1,400 fps, bullet mass must be 380 gr in order to reach the 1,662 ft-lbs of energy required. If velocity drops, bullet weight must increase to make up the difference. __________________ Never try to educate someone who resists knowledge at all costs. But what do I know? Summit Arms Services Taylor Machine
 September 1, 2010, 06:55 PM #3 LaserSpot Senior Member   Join Date: August 24, 2009 Location: Michigan Posts: 311 The .500 BPE ( 440 grains bullet ,580 m/s) should have plenty of energy to make it to 100 meters. Several of the bigger cartridges you list could meet the requirement depending on how streamlined the bullets are. Here's some load data. http://www.goexpowder.com/images/Loa...idge-Rifle.pdf
 September 1, 2010, 08:10 PM #4 Visaman Senior Member   Join Date: November 10, 2008 Location: Norway Posts: 302 The .500 BPE, barely makes it: Ballistic Coefficient: 0.210 GL Caliber: 0.500 in Bullet Weight: 405.0 gr Muzzle Velocity: 512.0 m/sec Distance to Chronograph: 2.0 m Range Energy (m) (J) 0 3469.8 50 2804.9 100 2287.1 150 1880.0 200 1560.8 The charge is GOEX FFFg - 130grains i am pretty sure it kicks a good deal. __________________ Summa pia gratia nostra conservando corpora et cutodita, de gente fera Normannica nos libera, quae nostra vastat, Deus, regna.
 September 1, 2010, 09:43 PM #5 LaserSpot Senior Member   Join Date: August 24, 2009 Location: Michigan Posts: 311 The ballistics are similar to a 3" 12 gauge sabot slug, but BP would make it a little worse; should be tolerable if the gun is heavy and you don't do too much shooting. This would be an impressive gun to shoot. I guessed .25 for the BC, but I was just guessing.
 September 1, 2010, 11:24 PM #6 sltm1 Senior Member   Join Date: February 25, 2009 Location: Idaho Posts: 336 This is a very peculiar discussion. If you Google ballistic lethality, I believe it comes in at 250fps by any projectile, by government standards. At that speed, shot placement is the determining factor, not slug size or power, just accuracy.
 September 1, 2010, 11:32 PM #7 RWBlue01 Senior Member   Join Date: March 16, 2008 Posts: 176 Legal energy demands? Legal for what?
September 2, 2010, 12:00 AM   #8
LaserSpot
Senior Member

Join Date: August 24, 2009
Location: Michigan
Posts: 311
Quote:
 Legal for what?
I had to look it up. These are the requirements for big-game hunting in Norway.

 September 2, 2010, 09:21 AM #9 Noz Senior Member   Join Date: February 25, 2009 Posts: 643 I have a hard time believing that anyone would question the hunting effectiveness of a .577 Express.
 September 2, 2010, 10:32 AM #10 Visaman Senior Member   Join Date: November 10, 2008 Location: Norway Posts: 302 Well, regulations are regulations. even if i am pretty sure that a moose drops dead on a encounter with a .45-70-405 ( .45-70 Government, 405 grains solid round nose lead bullet) that crawls along at 1,394 ft/s. But it does not have the minimum legal energy. And if you are caught hunting big game with a cartridge that does not meet the minimum legal energy, well.. Goodbye Mr. Hunting license. It is required that a cartridge/load does can be proved to meet the minimum energy levels. A .54 Muzzle-loader can do that, and are legal in Norway The problem is the reload time. __________________ Summa pia gratia nostra conservando corpora et cutodita, de gente fera Normannica nos libera, quae nostra vastat, Deus, regna.
 September 2, 2010, 10:49 AM #11 Jim Watson Senior Member   Join Date: October 25, 2001 Location: Alabama Posts: 12,669 A .45 - 2 7/8" (.45-110) should be able to drive a 520 gr bullet at 1350 fps for 2320 J at 100 yards. Assuming a ballistic coefficient of .36 which is conservative for those heavy Creedmoor bullets. Mike Venturino's book 'Shooting the Buffalo Rifles' gives bullet weight and velocity for many BP calibres which can be entered into the program at: http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi to estimate energy.
 September 2, 2010, 07:18 PM #12 RWBlue01 Senior Member   Join Date: March 16, 2008 Posts: 176 Visaman, can you apply for an exemption?
 September 3, 2010, 02:00 AM #13 Visaman Senior Member   Join Date: November 10, 2008 Location: Norway Posts: 302 Getting a exemption is extremely unlikely. __________________ Summa pia gratia nostra conservando corpora et cutodita, de gente fera Normannica nos libera, quae nostra vastat, Deus, regna.

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