trebilcock70
trebilcock70
1 post
Joined February 2014

SDB Crimp 9mm 147GR

I wanted to post something since there was very little out there "on the line" regarding 9MM 147GR loading on an SDB.

I have my SDB for a few years and have reloaded thousands of 45 ACP. I just acquired the conversion kit and dies to reload 9MM. Let's just say I am still a newbie with less than 5 years in reloading.

So I set up the dies using the few short paragraphs that the Dillon SDB manual presents. I started my bullet development and got the COL set at 1.100" like Hornady tells me for their 147GR HP-XTP's. I put in the required flare the manual tells me which is .015 to .020", I actually split the difference at .017" since I had read that since the 147GR bullets have a boat tail that not much flare was needed.

Well the first 5 cases would not run through my case gauge, not even close, half way in. I did check the cartridge width for bulge and there was none and the cartridge was within SAAMI maximum specifications for width after resizing It had to be in the crimp. Not much adjustment there and direction other than run die in until there is slight resistance against the shell plate and then 1/4 to 1/2 turn more after shell plate is lowered from die head.

So I did the only thing that made sense which was to reduce the flare by backing out the flare created by the powder funnel. Well it got better with small 1/8 turn adjustments until I got 5 consecutive good rounds using .005" flare.

So if someone has something I am overlooking with SDB set-up in order to make rounds that will chamber utilizing the 9MM 147's please let me know. As stated initially I wanted to share my experience and how I resolved so others could potentially benefit and create discussion on the topic.
winrob
winrob
1 post
Joined February 2009

RE: SDB Crimp 9mm 147GR

I'm reloading 147 gr Bayou Bullets. My cases are flared to +.017 and the crimp is set at .374. If the rounds were not going in your gauge, it must have been not enough crimp to remove the flare, as you figured out. The only other variable which can affect feeding is the OAL. Mine is set at 1.14.
dillon
Administrator
dillon
3,074 posts
Joined July 2007

RE: SDB Crimp 9mm 147GR

First, see if sized, empty cases properly gage. Some brands of brass do not work well with 147 grain bullets. On those cases, the webbing goes high enough up the inside of the case that the longer 147 grain bullet bulges out excessively at the bottom. No amount of die adjustment will compensate for this incompatibility.

Some 147 grain bullets have a boat-tail  to prevent this.