Is this the first time you have used these particular bullets? Do they have a cannelure for crimping? The round nose Rainers I have seen in Midways catalog don't. Are all of your cases trimmed to the same length and of the same headstamp?
My Lee manual states, when speaking of auto-loaders: "
Auto-loaders, such as the 45 ACP, usually have very little crimp, hardly more than enough to push the flare back against the bullet. You simply cannot crimp a jacketed bullet with a conventional die if it does not have a crimp groove. At best, the crimp die included with most die sets, will do little more than iron out the mouth flare. This helps for smooth chambering."
I thought the pressure from inertia upon recoil would cause the bullet to creep forward out of the case mouth. Not in. That's why you should crimp all revolver cartridges to insure they won't lock up the cylinder.
Lee gives a start charge for the 230gr jacketed bullet as 6.0grs of Unique at a Min OAL of 1.190 It seems your load should be very mild. Maybe differrent in an auto-loader, as the cartridges are held in a clip and may jump forward, causing the bullet to hit the front wall of the clip? I've never had that problem loading .223 though. I just use neck tension, unless the bullet has a cannelure.
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