The 457121 will definitely stabilize. They do just fine in my 20 twist guns, and they cycle through my 45-70 Marlin 1985 Cowboy like they are greased. No need to buy another mold. You have the best there is now.
Bill if you say it shoots that's Ok by me.I don't need to knock T-Rex out of his sneakers but always have preferred the heavy end of the bullet spectrum.Will be loading the 121 this week for a range test if it ever stops raining!
