It will handle the Barlows fine Nick - the Grandaddy's shouldnt be a problem either because they are narrow - just longer - I can quite remember - Rick the owner of the Hickory I got in for had a LOT of different knives - some slightly wider than your average Barlow-so it was with them that there was trouble getting them to fit into the pre-sewn Elastic holders, with Barlows I cannot see a problem whatsoever - the Hickory I bought in was a very nice Tan coloured roll.
Again from memory - we were comparing the rolls with some cheaper locally bought knife rolls - they were black and had a simple plastic click-in latch-as you do on everything - they were easier than the Hickory?...I apologize as I cannot remember just how the Hickory latched?
But in saying all that - the Hickory was lined nicely, it looked nice, and did the job well.