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31 Oct 2009
I've handled 5 guns with OSR so far. 2 1906-1908 era British doubles, 2 1920's British doubles and 1 1920's Belgium double. My only confirmation that monos cause OSR is the owners of 2 of these doubles that I've handled with OSR shot quite a few Barnes bullets through them. My doubles, 6 of them, that didn't have OSR when I got them and have been shot exclusively with Woodleighs, Hornady lead core and Hawk bullets still exhibit no OSR.

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28 Jan 2010:
The doubles I have seen with OSR (4-5), including one of my own, begin to exhibit the OSR about 8-10 inches down the barrels and the OSR continues to the muzzle.

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Now I am confused.
1. In October last year he had seen altogether 5 doubles with OSR.
2. None of his own doubles had OSR.
3. In January past he had seen altogether 5 doubles with OSR including one of his own.
4. He has used jacketed lead core bullets exclusively.
5. Has one of his doubles now developed OSR as a result of that? The 3 to 2 evidence of the first example seems to point to it.

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