Saturday, April 30, 2016

Foreign Ammo Energy Conversions

I ordered myself a few boxes of Prvi Partizan 44 Magnum 300gr SJFP Ammunition, this evening, from Palmetto State Armory. I placed the order in anticipation of me soon to be acquiring my new Ruger Redhawk 44 magnum revolver. The gun has been shipped to my dealer and my guess is it will arrive on Monday. I will pick up a box or two of ammo from the gun store but also wanted to get a few more online because it is quite a bit less expensive than what is available locally (but make no mistake about it, 44 Mag is expensive handgun ammo).

 
I took a look at the PSA website and they offered zero additional info on the ammo other than what it is and how much it costs. I then went over to Target Sports USA's website. I knew already, they did not have it in stock because I checked earlier. I also knew that while they still showed it on their site as an out of stock item, they also had information like muzzle energy and muzzle velocity listed for it. According to the info at Target Sports USA, the muzzle velocity is 1279 FPS and the muzzle energy is 1059 foot pounds. That is pretty impressive but I wanted to make sure they got it right so I also visited the Prvi Partizan website. Prvi Partizan had some different numbers up for this ammo showing a muzzle velocity of 390 m/s (meters per second) at 0 distance, and Energy [J] at 0 distance (or in other words probably at the muzzle) of 1479.

Hmm, what the heck did all that mean. It meant I needed to get some conversions figured out. I went to my favorite conversion website, US standard & metric unit converter calculator by Science Made Simple. I was easily able to discover that 390 meters per second is equal to 1279.5 feet per second. Target Sports USA was just essentially spot on for the muzzle velocity, only off by .5 FPS. So I am guessing that when Prvi Partizan says that the Energy [J] at 0 is 1479, they mean at the muzzle. As for converting the muzzle energy from Joules to foot pounds, that site also did it for me. Muzzle energy of 1479 Joules equals 1090.85 foot pounds. That is a bit different than what it says on the Target Sports USA website for the same ammo but I will settle for either the 1091 or 1059 because either way that is going to be one heck of a hammer blow to a Brown Bear's skull or spine if Brendan and I need to defend ourselves from one during our Alaska trip. After I did those calculations online, I was using the calculator that came with Windows whatever version I have) and found out that I could have used said calculator too since it has a conversions mode.

As for the Brown Bear defense aspects of this ammo, I have done my homework to some decent degree. This ammo is in essence going to be practice ammo because I intend to buy 300 grain ammo with hard cast bullets to use when we are in the field as opposed to this ammo with its semi-jacketed flat points. If I cannot find any by the time of the trip then this Prvi Partizan stuff will have to do. In doing that homework I just mentioned, I also came to learn that bear spray is a much more effective way to handle a charging brown bear and results in less injuries and deaths (to the people) than when only using a firearm. Bear spray, from what I can gather, is an absolute necessity in brown bear country and we will have that too. I have to wait until we get to Alaska to buy it or at least to pick it up at a store after ordering it online from down here. There is no way you can legally take that size a can of pepper spray onto a plane - not in carry-on or checked luggage but I have digressed.

Getting back to the subject of this post, the info about where you can do conversions, for foreign muzzle energy and muzzle velocity measurements, is all good to know if you are buying ammo from a foreign maker who lists its ammo energy in Joules and lists its velocity in meters per second.

All the best,
Glenn B

1 comment:

B said...

You can get decent conversion apps for any smartphone too..