If a 44 magnum 240 grain medium load got 1150 fps out of a six-inch non-ported model 29, what would the likely velocity be out of a custom 3-inch non-ported model 29?
I figure 50fps less per inch of barrel.
But it varies hugely I have 5.5 inch 44 that give faster vel. then any of my 3 7.5s inch 44s.
The only way to really know is conograph them.