No need to load 240 grain bullets "long". Don't worry about that part.
A lot of loads out there will greatly defeat the 10mm load with your Alaskan.
This one:
http://www.buffalobore.com/index.php?l=product_detail&p=232
Is what I use in my 629.
That’s a sick load to be sure but something tells me it might have a hard time staying in flesh. It’s a hard cast HP.
But I like the fact that it achieves that velocity from a 4” S&W Mountain Gun without going “long”.
So here’s the vague math for some purely hypothetical numbers.
According to BBTI the 240 Federal HS flies out of a 4” tube at 1,251, 3” at 1,095 and 2” at 944. From 4” to 3” that’s 156 fps less. From 3” to 2” that’s 151 less. 151 divided by 2 is 76 fps. So theoretically the 240 HS should fly out of a 2.5” tube at 1,020 fps. That’s only 554 foot pounds. Absolutely unacceptable!
Now I know that velocities can vary for any reason. The load, bullet weight, rate of twist, type of powder, all that stuff. Again this is theoretical. Velocity loss could very well be different. But the end result is that it’s quite possible to breach 800 foot pounds from a 2.5” tube.
So let’s saaaaaaay….
The Buffalo Bore 240 flies at 1,466 from a 4” tube. Subtract 156 fps and it MAY fly at around 1,310 from a 3” tube. Subtract 151 and it MIGHT fly out of a 2” tube at 1,159. Add 76 fps for another half inch and it could POSSIBLY fly out of a 2.5” tube at 1,235. That’s 812 THEORETICAL foot pounds!!!
WOOT!!!
