Thank you very much for this information.

So it would appear that continental loads were 16.0 g. (247 grs.) and 18.2 g. (281 grs.), and the UK Kynoch load was 245 grs.

It seems from your link (great post by the way) that the 16 g. load generally used a +/- 3.0 g. powder charge, whereas the 18.2 g. used a +/- 2.5 g. powder charge. Would it be safe to assume that this rifle (marked 2.9 g.) was therefore likely regulated for the 16 g. loading?

I am out in-the-field and away from home, but can take and post photographs at a later date. I will also slug the bore just to be certain, before ordering a run of custom bullets.

Thanks again.