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Gentlemen, I think most here are giving the answers to two questions, one that was asked,and one that wasn't asked! IMO, the question he is asking is the amount of conversion of the barrels for a starting point for the physical regulation to be done with the least amount of correction! The other answer is being given is in regard to working up a load after the regulation is done! These are two distinctly different things! "REGULATION" is the physical manipulation of the barrel's conversion to shoot a known load correctly! While "WORKING UP A LOAD" which is mistakenly called "REGULATING" is finding a load the will shoot to the regulation of a finished rifle!

In this case, I think the poster is asking about Physically regulating the barrels. For a starting point for this opperation, one first needs to know the chambering to be used in this rifle. Because the weight, and recoil generated will have great effect on the first setting!

Once we have that the answers can be offered!

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Well i didnt say what caliber than i tought that if not i would get a whole lot of data concerning conversion. But now when its already lost its a 45-70 with 66cm barrels in a 4kg gun.

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All of these ideas and calculations are correct as are none of them! That is why the only solution is the tried and true, trial and error method. Every rifle is a bit different, hence every rifle will have a slightly different P.O.I. This is true even of rifles (and shotguns!) of the same make, weight, etc. Sure you can make some calculation maybe to get you close but it'd probably be just as easy to use a BIG target for those first shots and make your calculations for the next soldering according to where the initial P.O.I.'s fall on that large sheet of paper.

That said I do find the idea of assembling some data base of KNOWN convergence degrees (breech to muzzle) interesting, as said simply as a reference in the initial assembly. However, if this truely was useful I'm sure it'd be used by the established makers for many years and someone would know something of it. As yet that doesn't seem the case eh?

At any rate, given the very low numbers of such rifles to be produced by the home craftsman such an approach seems hardly worth the potential benefit. Lacking that is one of those fairies!

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I disagre the convergence should be a factor of recoil, elapsed barrel time and weight of the gun.
But you are right that its for the initial assembly. The finetuning could only be made on the range with a torch. But it wouldt take many rifles to see a pattern of convergence.
And if i was used to build doubles and had done so for 150 years i wouldnt need the use for a convergence table either.

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Andreas

"Yeas it kicks like a mule he said, but always remember that its much worse standing on the other end"

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