Friday, June 4, 2010
Texas is Great
Sunday, May 16, 2010
Good Sunday
Saturday, May 8, 2010
Roving About
Friday, April 16, 2010
Ordain Them All!
Saturday, March 13, 2010
Clean the Gun, Clear the Head
Wednesday, February 24, 2010
Eschaton
Along with the ride and shoot imperative goes a bit of reflection on the Revelation to St. John the Divine. Why? Because apocalypse seemed suitably Lenten and I foolishly told one of the Missions that I'd teach a course on it - something I've never done before. Farrer gives a powerful account; here's an excerpt, on bestial numerics:
Friday, February 12, 2010
Shoot the Snow
Wednesday, February 10, 2010
Apocalypse
I've been hearing rumours for months, from friends who seem to know about money, that we should expect something nasty on the financial front. I was a bit skeptical, to be honest, but this latest from the Wall Street Journal's Marketwatch seems more than a little scary. Here's an excerpt:
"The Big One is coming soon, bigger than the 2000 dot-com crash and the 2008 subprime credit meltdowncombined. A huge market blowout. And as Bloomberg-BusinessWeek predicts: "The results won't be pretty for investors or elected officials."
After the global-debt bomb explodes don't expect a typical bear correction followed by a new bull. Wall Street's toxic pseudo-capitalism is imploding. Be prepared for a massive meltdown. Yes, already the third major bubble-bust of the 21st century, triggered once again by Wall Street's out-of-control Fat Cat Bankers. And it's dead ahead.
Can your family survive in the anarchy after the debt bomb explodes?
I'd say that wasn't very encouraging. Off to study The revelation to St. John the Divine as interpreted by Austin Farrer - Rebirth of Images, well worth the read.
Stockpile ammo and food,
LSP
Sunday, January 10, 2010
What Gun?
Monday, December 21, 2009
Sunday, December 6, 2009
Headspace
To simplify things, we shall assume that all cartridges are exactly the proper over-all length, which is of course not true with any factory ammo. We shall also assume that the chamber throating has been properly done. Also a falsehood in 99.9% of factory barrels.
First off, SAAMI specs are sloppy. Going by field gauges and go and no-go gauges will keep your case from rupturing, which is a good thing, but it isn't much of a path to accuracy or precision. Gauges generally accept .005-.006", I don't. You will see why this is important shortly.
Headspace is not a static thing in the firing of any kind of metallic cartridge firearm for a number of reasons. First off, there are the variable of action strength, design, and metallurgy. Break action guns are the springiest and falling block and interrupted thread artillery style breeches (almost never seen on small arms any more) are the stoutest. Therefore starting with perfect or near perfect headspace in a static sense in break action guns is especially critical. The weaker the action the more critical it is to get things right. Blowback semi-autos, delayed or not, also are sensitive not only in accuracy but in probability of misfire if headspacing is not correct.
When you have chambered a round in your firearm with a proper OAL cartridge and SAAMI acceptable static headspace all is apparently well. What goes un-noticed is what actually happens when you press the trigger and fire the round, as it's not directly observable under normal conditions in most types of firearms. When the hammer drops/striker moves forward and the primer is whacked, you are hammering SHARPLY AND VERY HARD on the primer if all is well. The denting of the primer cup absorbs much, but not all of this energy. You are whacking a tube of thin, soft, brass (varying in those properties somewhat depending on how it was annealed and if it has work hardened or not) and more gives than just the dent in the primer. We assumed proper OAL and chamber but keep in mind for reliability: If the chamber is wrong or the OAL is wrong, or both, you may get a misfire beause the primer strike mostly punted the cartridge forward in the chamber and you got a light primer strike resultant of that.
Break open guns have a great virtue for examining the results of this because as my amigo Mike Bellm of Bellm TCs has said many a time, "You CAN DIRECTLY not only SEE what happens, BUT you can also measure the results." He and I have discussed this many a time regarding accuracy and misfires, He is lucky enough to be working with BPI/CVA/Bergara Barrels on product designs and manufacturing methods and recently was over in Spain working with the Bergara Barrel Factory. In a recent email from Mike, he mentioned:
This today from the head tech at BPI/CVA/Bergara that I work with regularly and who took me to the Bergara plant in Spain the first of last month:
"I don't remember if I mentioned it to you or not but I dropped some loaded .35 Whelen rounds in a barrel and measured from the breech to the ctg base.
Average about .005". This was very consistent through this partial box. I
then dropped in a few misfired rounds that had been hit by the firing pin.
The average measurement went from .005" to .014"! Proof enough for me to
believe that the blow of the firing pin is crushing the shoulder."
..... and I have to add, all the more reason for YOU to be able to take the measurements and find these things for yourself, then make your own corrections as necessary.
That is a total collapse of .009" at the shoulder!
Rather interesting, is that not? Belts on belted magnums provide some insurance against such behavior, provided the belt is properly placed on the cartridge and the chamber is properly cut for the belt, which is not always true. I've gotten A-Square brass where the belt was misplaced significantly. I'm naming them directly here because if you Google their brass prices for safari rifle cartridge brass alone, not cartridges, you can see why it was vexing when they refused to talk to me about possibly replacing it with dimensionally correct brass. Didn't answer the phone messages or emails. Belts .008-.011 short of appropriate forward bearing surface are not acceptable and are of no use but scrap/example of shoddy product. I know this is a Christian page but some things aren't very forgivable if you wish to remain in business. Anyway, if the belt is wrong or the chamber isn't cut properly for the belt, your headspace will be variable dynamically even with a belted magnum designed to prevent case movement and assure proper headpsace because it will be headspacing via projectile on the chamber throat/barrel leade and/or case mouth and/or shoulder. Rimmed cartridge movement is primarily determined by the strength of the rim, provided the chamber and OAL are correct and the counterbore for the rim is correct.
So, you see why .001-.002' of headspace is a good idea for consistent shooting now? Dynamically, your acceptable static headpace very well may not be acceptable.
You can test your own firearms by loading empty cartridges with deactivated primers to correct OAL and "firing them". Then you'll know how much variation there is in the brass you are using/whether or not there are chamber issues. Then fix what needs to be fixed, if you find much variation. You'll make misfires very unlikely and gain accuracy.
Remember, mi amigos, all firearms may be interesting, but only accurate firearms are particularly interesting for anything but hanging on the wall and making loud noises.
Happy Shooting.
Friday, November 27, 2009
Bad Laterals, Worse Science Czar
Monday, November 2, 2009
All Souls
Thursday, September 10, 2009
Keep It Clean...
Saturday, August 29, 2009
Foresight
Friday, August 14, 2009
Freedom Of The Gun
CS: Simply put, it is about control. Control over what we eat, drive, what doctor we see, how much we earn, who we hire, or even live by. Absolute control over our lives…
Even today, I think Jefferson stands. Remove the right to bear arms and what other freedoms follow? You know the saying, "give 'em and inch and they'll take a mile." Neither fraction is one I'm keen to give up.
Thanks, Conservative Scallywag, for the answer and Liberty Pen for putting the question. See the whole interview here.
Good shooting,
LSP