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223/5.556 neck expansion

This topic has 4 replies, 4 voices, and was last updated 1 year, 2 months ago by Seth.

Viewing 5 posts - 1 through 5 (of 5 total)

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August 9, 2025 at 3:36 pm #536857
Timothy Fredericy
Participant
What do you guys use or does anyone use to expand the mouth(flare) so that non-BT bullets are easier to fit while loading them? I am having a heck of a time trying to get the 55gr SP bullets to stay in the case while seating them. What I am having to do right now is hold the bullet by hand while seating the bullet, if I don’t hold them 50% of the time they fall out.
- This topic was modified 1 year, 2 months ago by Timothy Fredericy.
August 9, 2025 at 3:47 pm #536859
tspence1950
Participant
Lyman M die.
August 9, 2025 at 4:29 pm #536861
SC
Participant
I put a good chamfer on the inside of the mouth with a deburring tool.

My seating die is a Redding Match, and I don’t see any issues. Just set the bullet on top of the mouth and guide it into the die on the way up.
August 9, 2025 at 6:26 pm #536866
Timothy Fredericy
Participant
Thank you, I’ll check that Lyman die out! That’s what I’m doing right now but it takes a lot of chamfering plus holding each one in as it goes up sure slows things down.
- This reply was modified 1 year, 2 months ago by Timothy Fredericy.
August 13, 2025 at 5:32 pm #536966
Seth
Participant
I had a similar problem loading 300 blackout – was actually slightly crushing the necks and causing issues when plunking in the barrel. Took me forever to figure out. Grabbed a Lyman M die and just ever so slightly belled the case mouth to just allow it to sit nicely on the case. Biggest issue is to make sure you use a crimp die after seating to push that bell back in, or it won’t chamber correctly.
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