Speedballalice,
Thanks for that info. I have used the Lyman 429251 bullet for my 44 Russian's in the Open Top since about 2003. Mainly because of the weight and a crimp groove. Yes, I did use only BP back then, but now have to use smokeless for my shooting.
I will try getting my hands on a Lyman 429184 bullet mold and give it a try.