No 10 nipples in place of 11?

[montanas]

I have 1 tin of 11 caps and a bunch of 10s for my revolvers. Does anyone make a 10 nipple to replace 11 on a investarms gpr?

 

[necchi]

Not that I know of.
It's the over-all length and orifice size that's the variable for the 6mm x .75mm that makes the difference in the factory made #10 nipples.
All the 6x75 nipples made for #10's are too short for the GPR and other rifles,,

You could make one to try(?). Take a common 6 x 75 nipple and chuck it in a drill,, run a file against it till a #10 cap fit's,,

 

[Eutycus]

Could you describe "orfice" size a little more.

 

[montanas]

Oriface
Filing one down was my next thought. I’ll keep informed how it goes. Thx