Loading 300 blackout on Dillon 550

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JJE76
New Member
Posts: 7
Joined: Sun Aug 30, 2020 6:57 pm

Loading 300 blackout on Dillon 550

Post by JJE76 »

I’m having issues setting up to load 300 blackout. Using Berry 220, LC brass trying for oal of 2.15. Getting down to that oal is damaging the brass right below the neck. Leaving a bulge, using Hornady seater die and the m1 carbine powder funnel to flair mouth a little. Not sure where I’m going wrong, loaded a bunch on a single stage finally wanted to speed things up. Single stage bullets seat perfect. Crimping in different step then seating.
20X11
Silent But Deadly
Posts: 1560
Joined: Fri Aug 03, 2012 11:43 pm
Location: Aurora, CO

Re: Loading 300 blackout on Dillon 550

Post by 20X11 »

Sounds like your seating Die is starting the crimp too soon...back it out in 1/2 turn increments until the bulge stops.
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