Buddy,
Many of us that reload 10 gauge with 1 1/8 or even 1 1/4 oz of shot place various shot cards in the bottom on an SP 10 plastic wad to accomplish the same thing you are. I'm shooting these 10 gauge shells in an 1881 Lifter Parker with Twist Steel barrels with impunity (so far). I would not worry about it.
Harry
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