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In our 8 inch siege mortar, a charge of Fg more closely matched the range table for 900 yards than cannon grade. Cannon grade shots fell over 100 yards short.
We had a great group at just under 800 yards, unfortunately the target pole was at 900 yards.
Twenty ounces of cannon grade and a 45 lb shell had a range of just under 800 yards.
Thanks for sharing that info. What about 20 oz. of Goex FG?
Pretty close to actual practice with our 8 inch siege mortar. Variations would probably be due to windage between shell and bore, and actual projectile weight. Thanks for sharing information.
Unfortunately the rest of our siege mortar work has been at 100 yards. We use 4 oz of FG and fifty degrees of elevation.