View Full Version : Newbie Q - "hourglass" shape in 9mm w/147gr. bullet
Newbie Question - I am loading 9mm luger for the first time with my Dillion 550 and Dillon Dies. Using Winchester brass and Montana Gold 147gr. CMJ with 3.4gr. Titegroup.
I am seating to 1.130" and getting a definate "hourglass" shape to the cartridges. The cartridge fits fine in my gage, but this is the first handgun cartridge that I have seen such a defined hourglass.
Problem or not? Should I be doing something different.
I have backed off the sizing die with no change in results.
Thanks, in advance, for your help. OD
As long as it chambers, and the overall length is correct, it's fine. Don't back off the sizer, adjust it per the instructions that come with the dies.
You'll be fine. I get worried when I don't see the Marilyn curves.
The hourglass shape itself is OK, as long as the round passes the case gauge. But watch out for thick brass like CBC - see my thread on the subject:
9mm gives more of an hour glass shape than others, and the 147 grain bullet seats deeply, exaggerating the effect.
The carbide sizing die causes this effect. The 9MM case has an outside taper from approx. .380" at the mouth to .391 just in front of the extractor groove. The carbide ring in the sizing die sizes the mouth of the case down enough to grip the bullet and also continues sizing the same diameter all the way down to where the die stops. A regular steel sizing die would have this taper built into it and would leave the outside wall tapered instead of acting much like a straight walled case sizer. But who wants to use a steel die and lube pistol cases? The 9MM case has more outside taper than most other tapered cases such as 40SW or 45ACP.
Thanks guys. I really appreciate the advise.
Glock talk rocks!
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