Mk3 accuracy - seems to vary wildly

[laverdabru]

Please refer to your earlier thread http://www.airgunbbs.com/showthread....om-22-to-5-5mm


The change date and groove information for the rifling changes are there. The reason for change was that machinery was getting worn out and new machines using a cheaper method of production were installed. All to do with costs, nothing to do with accuracy. Swaging is cheaper than cutting and there is no waste. Simple as that.

Check serial numbers of the rifles you are testing and cross reference the production dates with the date of machinery installation.

I would greatly like to see factual evidence that button rifling was introduced in 1969.

To Webley Wombler

'I would greatly like to see factual evidence that button rifling was introduced in 1969'

Can't help there, I'm afraid. I mentioned the 1969 date because I had seen it in the Thrales book, which does seem well researched. And thought it might be helpful.