side by side trajectory

[Mumptia]

Had a question posed to me the other day and couldn't quite answer it the way I wanted to.

When you are shooting a side by side shotgun / rifle, (depending on which barrel you are using) do you have to move the bead the same distance away from the target as the center of the bore to the center of the bead?

Better way to put it: If you aim at a target with a side by side and put the bead right on the target, will the slug / bullet hit the target the same distance (to the right or the left) away that the center of the barrel is to the center of the bead?

 

[tiriaq]

Properly regulated doubles will superimpose points of impact at a specific range. With a shotgun any divergence at shorter or longer distances is irrelevant because of the pattern size and the range at which the gun is used. A rifle is more demanding in its regulation, but you use the same sights and aim for both barrels. Point of impact should be close enough that any variation between barrels doesn't matter for hunting purposes at the intended ranges.

 

[Woodsman]

If the barrels are perfectly aligned, dead on. However, rarely do both barrels shoot exactly to the same point of impact when using slugs. On bird shot and buck shot, it doesn't matter.

 

[Mumptia]

Properly regulated doubles will superimpose points of impact at a specific range. With a shotgun any divergence at shorter or longer distances is irrelevant because of the pattern size and the range at which the gun is used.

What if you are using slugs and not scatter shot?

Point of impact should be close enough

So sub MOA is not an issue

QUOTE]

 

[tiriaq]

There are double shotguns made in France regulated for slugs. Problem with regulation is that it cannot compensate for a wide variety of loads. Chance of a conventional double regulating well with slugs is not good. I had one that would put Foster type slugs on point of aim from the right barrel, and a load of buckshot from the left would centre on the slug at 50 yards. Not a bad situation. But with two slugs, the points of impact from the two barrels were over a foot apart.

 

[Mumptia]

There are double shotguns made in France regulated for slugs. Problem with regulation is that it cannot compensate for a wide variety of loads. Chance of a conventional double regulating well with slugs is not good. I had one that would put Foster type slugs on point of aim from the right barrel, and a load of buckshot from the left would centre on the slug at 50 yards. Not a bad situation. But with two slugs, the points of impact from the two barrels were over a foot apart.

I had no idea side by sides were so finicky with slugs. A foot is a heck of a grouping

Thanks

 

[tiriaq]

Slugs have a significantly higher velocity than shot loads, and the weight is different. With the gun that I had, the groups from the barrels weren't bad, they just had nothing in common.

 

[sunray]

You sight in the same way you do for a rifle. Shoot the thing to see where the slugs go. The chokes in each barrel matter too. Two IC or modified will be better than either 2 full or a combination.