I went to my local Dillon dealer to see if they had a 45ACP shell holder kit for my 550B. I was in a hurry to do a special favor for a pal and don't usually reload 45ACP.

They did not have the 45ACP, but they did have a 45 Win Mag shell holder. After a lot of assurances and comparison of some off-the-shelf ammo, I went home with the kit. However after running 50 rounds, it seems a wee tad loose. I had one well-worn 45ACP case push through on primer seating.

This shell holder is marked "L". Is there an actual difference between the 45ACP shell holder and this one?

Curious in Suwanee