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Dugaboy, I always thought that the barrels were supposed to shoot to the same point? But, parallel bores make more sense from a design standpoint.

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333Jefery The bores are not paralell, but converge! This is where many get the idea that the bullets must cross paths! The barrels must be made to converge, because of what is called barrel time, and recoil arch. Simply, the RIGHT barrel will have a line of sight through the bore that points to a spot that is low, and to the LEFT of where the sights are pointing on the target, and vice- versa for the left barrel. IOW, they not only converge, but point low as well. The amount is decided by the man regulating the rifle by fireing it at the target, and with wedges soldering, and resoldering till the proper barrel convergence is met.

The barrle's line of sight through the bore does cross, the bullets do not! The reason the bullets do not cross, if properly loaded, is, when the sights are on your point of aim, and the trigger is pulled, the recoil arch starts. For the RIGHT barrel it recoils up, and too the RIGHT with the bullet traveling down the bore. The point where the bullet leaves the muzzle should be where the sights were pointing when the trigger was pulled, but slightly to the right of poa. and vice versa for the left barrel.

Take a square piece of paper, and draw a line from the top corners accross the paper to the opposite corner on the bottom of the paper. The point where these two lines cross is point of aim. The bottom LEFT corner is where the RIGHT barrel is pointing with the sights pointing at the apex of the two lines in the middle. As the rifle is fired the right barrel more or less follows the line up along that line till the bullet exits. Where it exits, determins where it hits the target. The slower the bullet travels, the higher, and farther to the right it will strike the target, and vise versa for the LEFT . The key is to have the bullet exit just at the point where it will strike a place just on the right of point of aim, for the right barrel, and the on the left for the left barrel. This means the center of each barrel's individual group, should be on it's own side of POA with a composit group for both barrels forming a group that the center of will be at the poa.

This convergence cannot be pre- programed into the rifle,even identical rifles of the same chambering, but must be done by trial and error! When the load is proper the bullets from one barrel doesn't cross the path of the other barrel in flight!

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..........Mac >>>===(x)===>
DUGABOY1, and MacD37 founding member of DRSS www.doublerifleshooterssociety.com
"If I die today, I have had a life well spent, for I've been to see the Elephant, and smelled the smoke of Africa!"

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It would make life a little simpler for the regulator if he sets the barrels to shoot to the same point.

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It might make life easier for you, because you don't have to finish the load developement, before you gat something you will accept! The whole idea of REGULATING the barrels is so they will shoot side by side, with a given load.

Folks keep confusing regulating with proper loading to shoot to the regulation. These are two intirely different things! The muzzle jump, and yaw is the same no matter what range you are shooting, with the same load! If you are loading your rifle to shoot one hole at any distance, it is not loaded properly!

The regulator has one advantage on you, he has a known load to regulate the barrels for. he knows that load is safe in his barrels, and by an educated guess, he solders them at a close starting point. He regulates by soldering shooting, soldering, and shooting till the barrels are shooting paralell to each other, but close enough that they form a composit group on the target . Distance is not a matter he is concerned with at this point. The barrel regulator is only interested that the barrels shoot to the same elevation as each other, and the spread beteen the individule barrel groups is no more that the distance between the center of the bores, apart, and that they form a tight composit group of both barrels. The rifle is completely regulated before the rifle is given to the sight filer. Because these barrels shoot side by side, the flip up sights can be made for several different distances, and only elevation is involved, for the sight filer!

You, on the other hand, can make up a load that will shoot to ONE HOLE at the distance "YOU" want,no matter how the barrels were regulated,or the sights filed, but that load will not shoot to the other sights, on the rib. If you are shooting one hole, at any distance, the bullets are crossing paths, and your load is slightly fast,and probably shooting a little low to the sights, but just slightly! This load is easy to fix, and it should be fixed, because it is not right!

If you back off very slightly till the barrels shoot slightly apart, but close enough to make an acceptable composit group, you will find the center of that composit group will match the elevation, at the distances filed into all the sights as well! Of course if you are sattisfied with a load that crosses, it's your rifle, do your thing, but just because you will accept it, doesn't make it a correct load!

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..........Mac >>>===(x)===>
DUGABOY1, and MacD37 founding member of DRSS www.doublerifleshooterssociety.com
"If I die today, I have had a life well spent, for I've been to see the Elephant, and smelled the smoke of Africa!"

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