I don't trust sierra much these days anyway. after a test on moly years ago, where they used only 4 barrels and I'd shot way more than that out using moly, their results did not mirror mine at all.
Then I've run some of their bullets at the speed parameters they need to expand and get no expansion. Then the next time you go bang the bullet comes apart totally....
I"ve had the most reliable expansion with their SMKs over the years.
Such that these days the best way for me, run the bullet I want at the speed I want and then take it down to the berm and shoot it into something that I think resembles a deer... a number of theories on what that might be, but something... and see if it opens or not.
