Ammo Caliber

In guns, particularly firearms, caliber or calibre is the approximate internal diameter of the barrel, or the diameter of the projectile it fires. In a rifled barrel, the distance is measured between opposing lands or grooves; groove measurements are common in cartridge designations originating in the United States, while land measurements are more common elsewhere. Good performance requires that a bullet closely match the groove diameter of a barrel to ensure a good seal. When the barrel diameter is given in inches, the abbreviation “cal” is used in place of “inches.” For example, a small bore rifle with a diameter of 0.22 inch is a .22 cal; however, the decimal point is generally dropped when spoken, making it “twenty-two caliber” or a “two-two caliber”. Calibers of firearms can be referred to in millimeters, as in a “caliber of eighty-eight millimeters” (88 mm) or “a hundred and five-millimeter caliber gun” (often abbreviated as “105 mm gun”).

Educational Zone #176 – Trijicon ACOG Scope

My friend doc 540 recently bought a new ACOG scope and wanted to sight it in. I told him we could go together and I would help him with it. I have enjoyed having an ACOG for a number of years. Mine is mounted on my Colt HBAR AR-15. Here it is: Mine is a 3.5 X 35 scope, Model TA11. It has a “donut” reticle and hash marks below the donut for bullet drop compensation. The hash marks below the donut show bullet drop [...]

Educational Zone #174 – The .22 TCM Pistol

My friend Liem recently obtained a new pistol and he graciously invited me to test it with him. It is a Rock Island .22 TCM. TCM stands for Tuason Craig Micromagnum and it is a proprietary cartridge developed by Fred Craig and Rock Island Armory. Some folks have mistakenly said it is a 9mm necked down to .22, but that is not correct. It is actually a .223 case, shortened and necked down to .22 with ballistics similar to [...]

Educational Zone #173 – Product Evaluation – Ruger PC Carbines

Recently, my buddy Liem asked me if I would like to shoot a couple of his rifles. They are Ruger PC9 and PC4 Carbines. Of course, I said, “Sure!” These carbines were designed by Ruger in 1996 and were discontinued in 2006. But they are still available for sell and can be obtained fairly easily. The “PC” in the name stands for Police Carbine, and the carbine was developed for use by police officers so that they [...]

The Box O’ Truth #59 – This Rifle is a Tack Driver

When I was growing up, it was a common saying for my Dad and Uncles to have an accurate rifle and for them to say, “This rifle is a real tack driver!” I even use the term myself now and then. It occurred to me yesterday, “I wonder how difficult it would be to drive a thumb tack with a rifle?” So, today we went to the range to try just that. I imagine if you get close enough, just about anyone could hit a tack [...]

Educational Zone #172 – Product Evaluation – Falcon Bullet Company, FalCoated Bullets

My friend doc450 recently got some bullets from Falcon Bullet Company that he uses for 50 yard handgun competition. He has had very good luck with them, often winning his Class.  Here is their site: http://www.falconbullets.com/default.asp But he recently got some new lead bullets that had a new coating on them to allow higher velocity without leading or excessive smoke. I decided to try some to see how well they [...]

The Box O’ Truth #2 – The Box Speaks Again

Another fine day at the range. This is the continuation of our tests from last week. My friend Tman and I went to the range this morning to learn some more. Notice that I have spaced the drywall out at 3 1/2 inches, just like an interior wall. I have one wall, then as much space as I can with the BoT, then a second wall, then a gallon jug of water, then a wall of bricks. The bricks are enclosed inside some 3/4 inch pine [...]

The Box O’ Truth #4 – Miscellaneous Rounds Meet the Box O’ Truth

I had friends on AR15.com send me some requests and samples and ask me to run them through the Box O’ Truth. So we went to the range to kind of tie up some lose ends. We used the Box O’ Truth with 12 sheetrock boards in it, backed up with a gallon jug of water to catch the round, and backed up finally by a wall of bricks enclosed in a wood enclosure. Started out with some ammo that Arowneragain sent me, some [...]

The Box O’ Truth #5 – The Locks O’ Truth

My friend DVDTracker, sent me an IM on AR15.com and asked, “OP, I wonder how difficult it is to shoot a lock off? I’ve seen it done on TV and in movies, but wonder if it is as easy as they show it to be. How about if I send you some funds to buy some locks. Will you shoot them and report back?” The only answer was, “Sure! Why not?” So, with funds supplied by LifeLibertyEtc, I set up an [...]

The Box O’ Truth #9 – Magazines vs. Rifle Rounds

If you ship it, we shoot it! My friend C-4 sent me a note, “Hey O_P, I see guys with AK-47 mags carried in pouches on their chests. I wonder if that would really stop a bullet. I’ve got some old mags. You want to try them to see?” What could I say? Sure! This is a typical pic of a guy in the Sandbox wearing a chest pouch full of AK mags. This also happened in Viet Nam with the VC carrying mags in this [...]

The Box O’ Truth #6 – Ballistic Resistant Glass Gets Tested

My friend Pighelmet sent me an IM on AR15.com saying, “Hey O_P, I’ve got some bullet resistant glass. Wonder if it will really stop bullets? Want to shoot it? I will send it to you.” The only answer was, “Sure! Why not?” The material is called Polycast, cast acrylic sheet. It is clear and 1 1/4 inches thick. The sheet was approximately 20″ X 14″ Of course, you give up something [...]
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