I'm not sure which tall rackfull you mean but I did take some old photos and set them up to show a few of my rifles.
View attachment 41141
From left to right, the first one is a Northhampton county boy's rifle in .36 caliber. Next to it is a Pecatonica River "Transitional" butt in .54 caliber. This would be a early style. Next is a Southern style, probably from the Carolina's (I didn't use photos to define this gun). Last, on the right is the Reading rifle I posted above.
View attachment 41142
Again, from the left is a "Early Lancaster" with the straight comb typical of Lancaster's. Next to the right is a "Late Lancaster". It's comb is similar but the butt is narrower and slimmer. The curvature of the butt plate is more pronounced. The checkering follows that used on a Fordney rifle I used as a basis for this gun. The checkering is not deep like modern checkering. It was more of a decoration.
Next to the right is the Bedford County I showed in the post above. Last, on the right is a Franklin County style. It is similar to the Bedford but it is not as slim. The lock used is typical of the locks used on other longrifles, not the long slim lock found on the Bedfords.
Hope this helps.