Spreader shells question

[Gary]

Ok.. on the advice (of some :-) from this group, (my 30" GH is Full and Full Damascus) and I decided to try the RST Spreader shells.. instead of opening the barrels for now..
Question: what kind of pattern can i expect from these shells, and how far will they shoot?
I am shooting Skeet and Sporting Clays..(not duck hunting)
Trying to get somewhat of an idea of how they will shoot... like Skeet, IC, Mod?
I guess any of those will be fine for me. I can see when shooting SC that i'll have to have 2 pouches, one for reg shells and one for the spreaders. LOL sounds like fun actually.. :-)

Also getting a lot of resistance from gun smiths that say they would not recommend opening up Damascus barrels.. they appear to be afraid they may start to come apart.. ??
(the barrels are not thin)
Thanks for your comments i appreciate it.