Originally Posted by gilmillan1
Update: 90 grains of powder and a 35 inch barrel. Possible?
You will likely hit the point of diminishing returns around 30 inches on barrel; just guessing here though. I'd query some of the threads on the bug 338's for more info on that. They've been playing with long pipes for as while.
I'd guess 3700- 3800 fps top even pushing to 65,000 Kpsi+ peak and using slow enough powders for compressed charges.