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doubleriflejack:
Anybody who has done shotgun to double rifle conversions successfully, including regulating the barrels, knows for certain, without doubt, that a properly regulated double rifle will NEVER HAVE BULLETS CROSSING AT ANY RANGE; BUT WILL HAVE bullets traveling parallel to reasonable range for caliber involved.

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Kudae:
IMHO a moot, purely theoretical question,asked by people who have never regulated a dr! ... I am quite content if I get a composite group, 3 right-left pairs, of 2 to 3" at 100 meters. This is practical hunting double rifle accuracy. The centers of most double rifle muzzles are about 1" apart, slightly more in real bigbores. Even if the individual barrels are capable of moa = 1" groups at that range and shoot true parallel this results in a 2" composite group, shaped like a liing 8. From then on the individual groups will overlap. At 200 you get at least a 3" group. If both lines of flight cross at 100 m you will get a 1" composite group at 100m and at least a 2" one at 200. Before both parallel and composite groups open up to 4" you will have exceeded the practical range of any double rifle, no matter if the barrels shoot parallel or cross at 100 m, despite of the optimistic express sights on most British rifles. Most older dr barrels will not shoot 1" individual groups at 100m at all, so the effect of shooting parallel or crossing is even less valid.

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doubleriflejack:
kuduae Well said; I fully agree; that has pretty much been my experience too!

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