Golly, isn't that special? I've had to machine my own seating plugs for some rounds, but if you don't have a lathe, that's problematic.
A couple of commercial solution. Jim Watson's old reply about the Lyman M dies is correct. Redding dies are now made with the same type M expander profile. Instead of a funnel flare, these expand the case straight down a short distance, then flair the mouth. That lets the bullet start in with much better alignment. I actually turned my own powder drop tube/funnel/op-rods for my Dillon measures in this profile because it is so superior.
The flat nose on your rounds is odd. Most seaters have a hole in the top center so lube can squirt out. I suppose you could drill one? Redding makes a competition seater for straight wall cases now. Not inexpensive, but designed to guarantee alignment. #55172 in 9mm. I got one in .45-70. They work well.
A couple of commercial solution. Jim Watson's old reply about the Lyman M dies is correct. Redding dies are now made with the same type M expander profile. Instead of a funnel flare, these expand the case straight down a short distance, then flair the mouth. That lets the bullet start in with much better alignment. I actually turned my own powder drop tube/funnel/op-rods for my Dillon measures in this profile because it is so superior.
The flat nose on your rounds is odd. Most seaters have a hole in the top center so lube can squirt out. I suppose you could drill one? Redding makes a competition seater for straight wall cases now. Not inexpensive, but designed to guarantee alignment. #55172 in 9mm. I got one in .45-70. They work well.