choke questions

boots-

boots-

Regular
EE Expired
Rating - 100%
1   0   0
Location
Fort Saint John. BC
so im sure ive asked my fair share of dumb questions heres a couple more:p

1) how much of the barrel is actually used to make the choke on a shotgun? i realize it will probably be different for each brand but they have to be close. is it cylinder bore up till the last couple inches? last foot? could you remove a small portion off the end of a barrel to open up a choke?

2) a shorter barrel allows more spread than a longer barrel so could you just choke a shorter barrel more so that you end up with the same pattering as with a longer barrel?
 
The length of the choked section varies, but about 1-1.5".

Trimming the barrel does not work well, it is best to ream the inside of the barrel to the desired dimension.

Don't let barrel length into the equation, it means so very little that it is a non-issue.
 
The second question has been answered, so to the first .. the choke is in the last couple inches (the muzzle end).
 
thanks for the replys lodi, tpk. im traveling right now and left a shot gun half refinished it has a very tight choke and was considering trimming it but will proboly just leave it. i dont think the gain is worth the work of reaming it.

ben hunchak just because the cleaning rod with the wad gets tight at the end wouldnt necessary mean the barrel wasnt tapering down gradually for longer before the tighter restriction at the end. just some thing i was wondering while sitting on a 5 hour train ride. sorry if my question upset you it says right at the top it is probably a dumb question...
 
boots- said:
so im sure ive asked my fair share of dumb questions heres a couple more:p

1) how much of the barrel is actually used to make the choke on a shotgun? i realize it will probably be different for each brand but they have to be close. is it cylinder bore up till the last couple inches? last foot? could you remove a small portion off the end of a barrel to open up a choke?

2) a shorter barrel allows more spread than a longer barrel so could you just choke a shorter barrel more so that you end up with the same pattering as with a longer barrel?
Click to expand...

Differences between brands can be remarkable. I recently gained access to some internal diameter barrel measurement tools. It's too early in our research to begin making pronouncements, but one thing is obvious:

Many of our preconceived notions about barrel profiles and chokes in particular are not based on fact. There are, indeed, significant differences in the design implementations of chokes by different makers.
 
Some of the newer design chokes are quite a lot longer than the traditional "mobile chokes". In the case of Fabarm and Caesar Guerini, the choke constriction is at the rear of the choke with the front half being cylinder -- these screw in chokes are about 3 1/4" long with the theory based on the venturi (spelling?) principal -- in that when you constrict the flow of a substance (in this case shot) and then cause it to open up suddenly, the speed and pressure is greatly increased (somewhat like a garden hose). In fact Fabarm who originally designed this for shotguns claim better patterns and "52% increase in down range hitting power" with their full choke "Exis HP choke" being approved for steel shot.
They designate their chokes as skeet/short/medium/long/xtreme and a couple of others.
So that being said --- traditional thoughts on shotgun barrel interiors are out the window. Pattern your gun with different sizes of ammo and different brands -- you will be surprised on how much these affect performance.
 
Boots: first off asking a question concerning something you don't about and wish know more about is not stupid, it's actually showing smarts!

To answer #1. in general the last 2". And thats in general as stated each manufacture varies. There are many different types, jug, straight taper, etc.
There has been extensive reasearch and volumes written on the subject of chokes. The end result to-day is lengthened forces cones ,( the area of barrel just a head of the chamber) over bored barrels, and screw in chokes.

#2 The shot spread is determined primarily by the choke. The forcing cone and over bore have a minor roll, this being controlling shot deformity.
Barrel length has virtually no practical impact on pattern spread.

Hope this helps somewhat.
 
You must log in or register to reply here.
Back
Top Bottom