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Posted On: 12/16/2020
By: Clifford Radcliffe
A: Thanks for reaching out Cliff! I'm afraid Magtech only offers this round's ballistic data as recorded from a 10" barrel. You can see that here: magtechammunition.com/products/ammunition/500-sw-400gr-sjsp-flat/
There's no formula to convert a round's muzzle velocity to a longer or shorter barrel – you can only ascertain such data with a chronograph.
I'll do my best for you, though. I'm going to take a rough guess that a 1.5" shorter barrel with ports is going to have a 90 fps slower muzzle velocity for a G1 BC of 0.178. I could be WAY off, but if I am right here's how the ballistic data you've requested would look:
Range Elevation Energy Vel
(yd) (in) (ft.lbf) (ft/s)
0 0.00 2047 1518
25 0.54 1824 1433
50 0.00 1629 1354
75 -1.71 1460 1282
100 -4.75 1315 1217
125 -9.26 1194 1159
150 -15.38 1095 1110