Chris,
To start with, welcome to the forums!

To post here just look up at the top right hand side of what I'm writing here and you'll see a REPLY button.
Just click that button and you can post, but you will need to log in first.

I'm sure our members will be able to help you both with information on your double and also on posting photos.

I would strongly advise NOT to shoot any more Nitro loads through that rifle untill you know what it proofed for though!

If you still have trouble posting on the forum just PM me again and I'll help you sort it out.