I found the closed grip on the Forbes 24 could come back to wrap the back of your middle finger. I assume the NULA's are the same, so will have to check that tomorrow.
Of the four ULA/NULA guns I have (243, 7mm-08, 300WSM and 50cal ML) the only one that whacks my middle finger knuckle is the 300WSM and that's only from the bench.
