Quote:
but I'd like to see how fast it could push say a 180gr XTP.
13.5gr of H110 got me a 1106fps out of my 6" barrel and didn't feel very eventful when shooting it. Has anyone done something hotter?
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Keep adding powder until it blows up, and then you will know the limit of the GP-100. Keep track of your data so you know when and how much powder it took to do so and adjust from there. 
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