470 NE Merkel 140, non-ejector- been to Africa twice and used well

Doubled while firing front trigger first after a hundred rounds or so from new.
repaired that, then would double 99% of the time when i used rear trigger first (normally it is front trigger first) - 3 visits to good double gunsmiths (here in Canada) who removed the front set trigger, repaced it with a non-set hinged trigger for my fat fingers because everyone thought it was my fault.

On the 3rd visit - a very small burr on an internal part was finally found to be the reason. Fires excellent and safely now.

I was worried because i love this rifle. BTW I removed the auto safety as well as well as extended the LOp to fit me perfectly.

Trigger weights are approximately 4 front 4.5 rear