I have a small problem. I have a S&W with .434 throats. I had a custom mold made for it, and a custom Star sizing die, but all my case crimping dies swage the blasted front driving band on my cast bullets down. All three dies have crimping shoulders smaller in diameter than the bullet, which is a solid .434. RCBS claims their Cowboy dies are a bit larger in some dimensions, but I can't find out if that includes the crimping die. Midway has crimping dies in stock, but they have never been a fountain of knowledge in cases like this.