One more saddle question

[RhndLev@cs.com]

Okay, I have finally decided to order a saddle.  I have decided color 
(black), style (endurance), but still have to decide what kind of rigging I 
want.  Sigh.  A year ago I didn't even know what rigging was or that this was 
a decision I had to make.  I have used mainly saddles with conventional 
rigging, but the saddle I am ordering comes with "center-fire" or 7/8 
rigging.  Is 7/8 rigging the same as conventional rigging?  If so, are there 
any advantages to having a center-fire rigging?  

I am ordering the saddle for my new TWH mare if that makes any difference.  
The saddle is from Liberty and is on their "Tennessean" tree.  I have noticed 
that my Billy Cook, while it fits okay, does impinge on her shoulders when 
she gaits.  Is that a result of the tree or the conventional rigging?  Does 
any one know or want to hazard an informed opinion for me?

Rhonda


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