I have a GP-100 with a 4" barrel. So far 2400 with a Hornady 125 gr XTP and AA-9 with the Montana Gold 125 gr JHP have been the best performers. I tried 296 and got sprayed on the arms and face with burning powder. From what people say it works fine in longer barrels.
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My Calibers: 22 Hornet, 223 Rem, 22-250, 243 Win, 270 Win, 280 Remington Ackley Improved, 30-30, 308 Win, 30-06, 300 Winchester magnum, 7.62x39mm, 380 Auto, 9mm Parabellum, 38 Special, 357 magnum, 40 S&W, 10mm Auto, 45 GAP, 45 Auto, 12 & 20 Guage
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