doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Barrel regulation problem

How well regulated are try-gun barrels? A poorly regulated try-gun could send a lot of shooters off in the wrong direction over the course of 20-30 years . . . .

Until you shoot it on paper from a good rest you will not really know where it shoots.
I just got done patterning a Parker that I opened the chokes on. It didn't shoot where "I thought I was holding", but, I believe it was just my 70 year old shakes.
Bob Jurewicz

Patterning off a bench sounds like a good idea, Bob. Also, I think one should shoot a 5 shot group to really tell where point of impact is....sort of the average of 5 shots...in case of a flinch on one of the pulls which is likely to happen for many shooters. I also recommend Jim Eyster at Heritage Gunsmiths for barrel work. Jim can adjust poi by working on the choke.....eccentric choke, but he can only move the poi about 2 inches or so by that method, as he explained to me.

Does anyone use slugs to determine if a gun is shooting where it should?

Jay

Whole different ballgame, Chas. A gun that throws slugs well (and, few doubles will do that well, unless they were built up as slug guns) may or may not throw patterns to where you are looking.
The slug guns built up by the Bruchet's had a bunch of work done on the barrels to get that to happen. My brother slug hunt with a Savage Fox model B (the cheapie) that consistantly puts the right slug on a pop can sized target at 50 yards-the slug in the left barrel goes, well, some where.

Best,
Ted

Now THAT is funny!

Teddy Bean pontificating on "slugs."

Of course, there IS no higher authority...

Don't worry fellas, I got this.

Allrriiight now, Bob, back to Misfires where you belong. Sure don't need you up here. Heck, Life on the Rez ain't so bad. Besides, it's infinately more interesting then listening to a bunch of old hens cluck about whether they got a magazine or not. I think there's some deep discusion about the Anti-Christ going on, and all kinds of other shenanigans. Let's go see if we can smoke OWD out of that bunker he's hunkered down in. Shoot, if I had Keith and Dave circling above me, even I'd think twice about pokin' my head up.

I wonder if that gun was as ugly as that Boss he was pimpin' a while back?


__________________
Gettin' short and too much time on my hands.
http://youtu.be/i0DysKvt4K0

I'll give you the procedure that was given to me at the school for POI/POA testing that has never failed me.

1) You don't need to shoot off a bench but you do need to be steady, if you can't be steady then shoot off a bench, sticks or whatever you need to. Just don't rest your barrels on anything, especially thin English SxS barrels.

2) You need a rear sight so you can repeat your hold. The proper height is two quarters taped together, I use a bit of poster tack to stick them to the gun so they don't fall off with every shot. Apparently one of the English coins is the thickness of two quarters and that's where it came from.

3) Your sight picture should be resting the bead on top of the quarters. I use a 2" orange stick on dot and hold right on it. Do this at 16 yards. It has two purposes:

A) Adjustments of one inch on the target correlate to 1/16" on the sock which is easy to work with. (Irrelevant if both barrels don't shoot where the're supposed to.) The plus side is if the barrels are properly regulated you'll know what stock corrections to make to get it to fit you.

B) Gross problems will be readily apparent at this distance. The gun may well be regulated for 40 yards but it's extremely difficult to estimate the center of a pattern at that distance. Additionally try to hold on a dot at that distance and you'll see you're pissing in the wind, small movements are going to make big changes. For POI you have to eliminate shake, poor sight alignment and poor hold or this is going to be a waste of time. This is when you'll realize that most shotgun triggers are not so great, throw out patterns where you know you had a bad trigger pull. No gun that is grossly off at this distance is going to be magically on at 30 or 40 yards.

4) One shot per piece of paper, don't shoot overlapping patterns when shooting for POI.

5) If you find your barrels are just a little off then back out to the distance you think the gun is regulated for and test again. That's where you can check your pattern to see if it's acceptable at that distance.

Lastly, I use a computer program (Shotgun Insight) which allows me to take digital pictures of my patterns and analyze them. It will give you a graph showing where you aimed and where the center of the pattern hit. When I sent the printout in to the smith for one of my guns he couldn't believe how useful it was. It really illustrates if something is out of wack and helps prevent a company from saying "we shot it and it's fine." Also it lets me check repair work to see if they're blowing smoke up my a**.

Contact me if you want me to run your patterns through the computer and I'll let you know what set up I need to do it. Essentially all you really need to know is what load you're shooting, the distance, hold point and something in the picture for scale.

That coward belongs here? I think his tag line sums it up pretty well.


Best,
Ted

If you are shooting at a patern plate there two points you may want to consider particulrly with OUs .
1 is the gun being held square on or upright ? It is supprising the number of people that cant a gun into there face so that the barrels are at an angle .
2 is the rib exactly centered and is the bead in the center of the rib? I recently relayed the ribs on a well known make of Italian gun and was supprised to find the rib was originaly one sideded .I have also found it is not uncommon for beads to be off center .OK may be ony a few thou but it all adds up .