Speer has recorded pressure spikes as high as 50,000 cup with 9mm rounds set back in the case, crimp is your friend in 9mm. 50,000 cup is high pressure rifle territory, your pistol will detonate. The Lee Factory Crimp die is cheap and prevents all sorts of issues with reloaded rounds.
9mm crimp?
- Thread starter ghost2vp
- Start date
- Location
- West of the Rockies, on an island.
Many, many moons ago when I first started reloading for the 9mm, I initially made the mistake of over crimping (taper) the loaded rounds. I was using cast lead bullets. This resulted in the projectiles being loose in the case and they could easily be turned by hand. Prior to crimping, the projectiles were held firmly in the case. By applying less crimp, the situation was resolved - the bullet was held firmly and the slight bell was removed.
- Location
- Niagara Region, Ontario. For now
The problem, as has been mentioned, is that overcrimping causes the bullet to be even looser in the case especially with lead, or plated bullets, making bullet setback even more likely, and also causing accuracy, and leading issues.
Like I said before, its a delicate process, and I'd stay on the lighter side of things.
I have reloaded over 10, 000 rounds of 9mm in the last few years since I started reloading with little to no crimp at all and never had an issue except when I overcrimped some lead cast.
I do have Speers #14 (shhhh), and in the 9mm luger dada they state TAPER crimp is required ... for it headspaces on the case mouth.
In the handgun reloading section (bullet seating and crimping) it states that relovers are usually roll crimped while semi auto require taper on no crimping. It goes on to state the for 9 mm luger, excessively deep seated bullets will raise pressures to potentinally unsafe levels (and I believe they say this to state the importance of bullet seating depth).
They also go on mention that due to is small shell capacity a change in bullet depth can have significant effects on pressure.
maybe they changed their wording in the #14.
Serria 5th states taper crip is recommended for semi auto 9 mm luger. And the impression I get is that the recommendation is to avoid bullet movement (set back) from recoil ect.
if anyone is interested
In the handgun reloading section (bullet seating and crimping) it states that relovers are usually roll crimped while semi auto require taper on no crimping. It goes on to state the for 9 mm luger, excessively deep seated bullets will raise pressures to potentinally unsafe levels (and I believe they say this to state the importance of bullet seating depth).
They also go on mention that due to is small shell capacity a change in bullet depth can have significant effects on pressure.
maybe they changed their wording in the #14.
Serria 5th states taper crip is recommended for semi auto 9 mm luger. And the impression I get is that the recommendation is to avoid bullet movement (set back) from recoil ect.
if anyone is interested
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wasnt trying to poke the fire with my comment above ... I just bought a browning HP III in 9 mm luger so I have a interest in this particular caliber. So to me .. whatever works and blows your hair back!! Every gun is different!!
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- Location
- Niagara Region, Ontario. For now
Try reloading a 9mm without a crimp, and attempt to push the bullet back in the case!
I can put almost my entire body weight on it without it moving, and no crimp.
Just sayin......
I can put almost my entire body weight on it without it moving, and no crimp.
Just sayin......
