what size martens front aperture are being used for small bore standing?

Hi, I see no-one has responded to your query. I use a .90 aperture for .22 standing in an Anshultz front tube id that helps.
Regards, Peter

I've done a lot of testing with Steve over the winters with air guns and from that I've decided to use .070 In the front aperture of my .22 standing gun.

Thank guys, I currently have a ..060 and it seems a little tight