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Old March 23, 2013, 06:32 PM   #7
Senior Member
Join Date: September 8, 2007
Location: Mississippi
Posts: 14,257
If you use RCBS cowboy dies it's not so bad. Originally the 44-40 was sized to .427. Modern 44-40's are sized to 429. Most reloading dies still size to .427. Trying to shove a .430 bullet down a thin .427 case neck results in a crushed case. The cowboy dies size to .429. If you have dies from another maker you can use a .44 mag expander plug or what I do is use a wad punch to bell the case mouth a little more.
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