doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com INTENTIONAL PITTING OF SHOTGUN BORES

Interesting report of a significant improvement in pattern density over time, felt by Greener to be from 'burnishing' of the bore. I understand we are discussing both non- and plastic wad protected shot
The Gun and Its Development, 1907
http://books.google.com/books?id=3HMCAAAAYAAJ&pg=PA353&source

Please note: I freely concede that others here are brighter, better looking, have more valuable shotguns, and have killed more birds behind better dogs; therefore in responding please consider Proverbs 18:2 and try to be helpful.

Some frenchman must have pissed a lot down my Darne barrels because by the looks of them they should throw a great pattern!

Drew stop that! You are so inconsiderate. How would we have any fun if everybody copped that attitude? You never think of others, just yourself.

Longer shot strings you do not want! Winchester super x loads were first touted as shortening shot strings and therefore improving the killing pattern. In the three dimensional cloud of shot, a duck passing through the rear of an extended string will more likely be crippled than killed cleanly. There will be fewer pellet hits. To those who think it increases the ability to hit passing shots at all, I say--practice instead. Just my two cents...Steve

Franc I've always liked you through the years. Your posts and contributions were and are always welcome as they bring a good degree of knowledge, honesty and unabashed inquisitiveness spiced with a nice dash of curiosity.

But my esteem for you has just risen upon learning that you are a man who has not only read the entire W W Greener tome once but "at least" twice! Now that's a sure sign of a man hungry for the right kind of knowledge.

As they would say in your native land, or at least in movies of that land, "Good Show!".

Jonsey;
Would you care to explain the fact that wads have definitely been known to be left in a bore while the complete shot charge was "Expelled". The Shot did not stop when the wad stopped. Its known as "Momentum/Inertia". The heavier weight of the shot gives it greater inertia than the wad. Now understand I'm not saying that in fact roughing the choke area a bit does indeed slow the wad, that's the theory of it. The Theory though is just as sound as your theory the wad cannot be slowed with out the shot being slowed an exact & equal amount. That theory Don't Hold no Water either. Note that the Vast Majority of the movement of a gun in recoil occurs after the charge has left the muzzle & the gun is given no more impetus to recoil. What has happened is that in that short period of time the charge is still in the bbl the gun has been given the Impetus to set it in motion & given enough momentum to keeep it in motion for some longer period of time than it is actually being pushed. According to "Newton's Law" if you fired a total charge weight of 1�oz (shot, wads & powder) down a bbl in which it could travel 30" & the gun weighed 7lb the while the charge was traveling that 30" the gun would travel 0.335" in the opposite direction. Now I doubt seriousl;y you or anyone else would question the "Fact" that gun will travel a lot more than .335" in free recoil, yet after that amount it is no longer being "Pushed" as the charge is gone.

An old time trap shooter I knew used to carry a bit of crocus cloth in his pocket. He would wrap it around his little finger and make a couple of turns in the muzzle of his trap gun. His theory was it roughened the choke slightly which produced a better pattern. Subsequent shooting he claimed, would smooth it back out and he would repeat the process. It was religion to him at a trap shoot. Whether it actually worked or not, I can't say. Trapshooters are well-known for a multitude of idiosyncrasies....almost as much as pigeon shooters.

You've described momentum well, 2-piper.

Understand though that I'm talking about a reduction in acceleration, not a reduction in velocity.

If you were to vent the pressure off prior to bore exit then not only would acceleration stop but deceleration would begin due to bore friction and air drag.

A powderless shotshell does exactly that. The wad sticks for the reason you've described.

A properly functioning shell though accelerates the payload all the way to bore exit and internal ballistic graphs show this well.

I'd rather read a discussion between Jonesey and Miller than eat when I'm hungry.



SRH

Jonsey;
Yes I fully understand we're tslking about a slowing of acceleration. Also Yes if the rate of acceleration of the wad is slowed that of the shot will also, "BUT" it is not a given that it will be an identical slowing. It is certainly possible for some External factor to have more influence on the wad than on the shot.