Drilling-"problem"...

17 July 2003, 00:53

I have a Krieghoff Plus drilling, with a clawmounted scope. Without the scope, the rifle- and shotgun barrels will fall together. But with the scope mounted the shotgun barrels will shoot a little low..
Not much. Actually I think it won`t make much of a difference in a practical hunting situation. But I really can`t get it out of my mind.. [Smile]

Any suggestions about what to do..? What`s the reason for this problem..?

17 July 2003, 04:54

mho

quote:
Originally posted by Anders:
I have a Krieghoff Plus drilling, with a clawmounted scope. Without the scope, the rifle- and shotgun barrels will fall together. But with the scope mounted the shotgun barrels will shoot a little low..
Not much. Actually I think it won`t make much of a difference in a practical hunting situation. But I really can`t get it out of my mind..
Any suggestions about what to do..? What`s the reason for this problem..?

Anders, I don't think you should attempt to solve this (perceived) problem. Most Drillings have such perculiarities. E.g. my Drilling will not shoot to the same point of impact when I have my pressure fit insertion barrel (.22 Hornet) mounted, and when it is not. It is not a whole bunch of difference, and if one is really particular, one can re-sight. I mostly don't bother - I rarely use my Drilling for long shots.

There are even people who believe that Drillings won't shoot to the same POI if not all chambers are loaded. I can't really tell with mine.

I have a feeling, that what you are seeing is simply the effect of attempting to make several, soldered barrels shoot *about* the same in all situations - probably almost an impossibiliy. In my opinion, you are lucky if your shot barrels shoot where you expect them to with no scope mounted - assuming you might want to use that configuration for driven hunts with shot (common in Switzerland). What to do when you mount a scope, and you want to whack a fox in the middle of the night?? Since your barrels are soldered (I assume), not much you can do, other than pattern your shot barrels with the scope mounted and compensate a bit - if at all necessary. Luckily, in these situations, you probably have a bit more time to think before you need to pull the trigger.

Alternatively, you could try to contact Krieghof for help - if you really don't think you can live with the perculiarities of the Drilling. Nice gun, though...

- mike

17 July 2003, 05:09

Anders

It`s not much of a problem actually. And, I guess guns with soldered barrels especially are pretty sensitive.
Your answer was really informative, and I`m actually a bit more reliefed now.
It`s a really nice gun. I great gun for combined hunts, and when you don`t want to miss any chances.. [Smile]

On the other hand it`s neither a rifle or a shotgun. But if you use it enough, both in the field and on the shooting range, you will come pretty close to both!
Thanks, mho! [Smile]

17 July 2003, 18:51

dian

While not a scientific answer, I would suggest that the additional weight of the scope on the drilling effects recoil movement of the gun during the time the projectiles are still in the barrel. This would change the point of impact of projectiles from the barrels that are not sighted in with the scope
To demonstrate try adding the weight of a scope and mount to a traditional rifle and noting the impact point differences with and without the additional weight using the same sight picture and hold technique.

18 July 2003, 00:32

HenryC470

Dian is correct. When you added the scope, you moved the center of mass of the gun upward, closer to the bore axis. The muzzle isn't rising as much as it used to. You could almost restore the old point of impact by adding weight below the axis of the bore (lead in the forend?). I say almost, because the total mass of the gun is going up, and there will be less motion because of increased moment of inertia even if you restored the old center of mass.

H. C.

18 July 2003, 00:56

Sauenjï¿½ger1

quote:
Originally posted by Anders:
...
And, I guess guns with soldered barrels especially are pretty sensitive.
..

Not the soldering is the problem. Only the "Multi"barrel situation.
Even with adjustable barrels you will have the same problem. But you can adjust without problem acc. to your wishes. I only will remind about the discussions how to adjust a double and the time between the shots.

The soldering has two bad properties:

1. The adjustment is a lot of work, needs specialists and special devices. So it costs money.

2. On the range you always have to wait that the barrels become cold to avoid the change of the target point due to bending the bundle because of a warm barrel. On hunting I don't think it is a problem. Exept you are on culling a herd of game within a short time. But I think then you would not use a Drilling.

But one good thing: If it is fixed, it stays at the point. Not all adjustment devices can claim this.

Best regards