Will the 1:30 twist of a .45 caliber Green Mountain barrel stabilize a long heavy 465 grain/.451 lead bullet?
Somewhat to my surprise, YES IT WILL.
Might they be accurate?
It would seem so.
Here are the test results.
75 Grains GOEX FFFg @ 50 Yards.
85 Grains GOEX FFFg @ 50 Yards.