eldeguello, the difference that seperates the Beartooth bullets and the LBT bullets is that Beartooth will size your bullet order to fit your actual bore diameter, and it makes all the difference in the accuracy world!
I have some LBT .458 430 gr bullets that I shoot, but I had to shorten my 45/70 cases .060 before I could use these bullets in my Marlin, even then 3"-4" groups were as good as I could get. Beartooth 425 gr. sized .460 will work in standard length cases and I expect near 1" or better groups, my best so far is a group that measuered .444.
I wish I could tell you I can do that on a daily basis but no , 1" is not to hard to come by though.
By the way I'm talking 3 shot groups, because it's hard to stay focused for many rounds at this recoil level.