Possibilities:
Case length - .45 ACP head spaces on the front lip of the case. Believe the spec calls for a case length of 0.898 inches. Longer will result in too much case protruding from the receiver and you won't be able to lock up the pistol action.
Case width - Should be taken care of by the resizing die which will reshape and resize the case to spec.
Too much case mouth flare - should be taken care of by the loading die which will slightly roll taper the case mouth in addition to setting the bullet to the desired OAL.
If you don't already have one, I suggest you get a .45 ACP cartridge check gauge. It looks like a fat stainless steel cylinder with a hole on the cylinder axis into which you drop a finished cartridge. If all cartridge dimensions are inside the max spec the cartridge will fit and drop out easily and should work in your pistol. If the cartridge is out of spec for head space, case width or overall length it won't fit properly into the gauge.
Suggest also getting a factory crimp die which will let you fine tune the taper crimp of the case mouth. Has the added benefit of doing a final resize to assure width is right along the whole length of the case.
Hope this helps.
Case length - .45 ACP head spaces on the front lip of the case. Believe the spec calls for a case length of 0.898 inches. Longer will result in too much case protruding from the receiver and you won't be able to lock up the pistol action.
Case width - Should be taken care of by the resizing die which will reshape and resize the case to spec.
Too much case mouth flare - should be taken care of by the loading die which will slightly roll taper the case mouth in addition to setting the bullet to the desired OAL.
If you don't already have one, I suggest you get a .45 ACP cartridge check gauge. It looks like a fat stainless steel cylinder with a hole on the cylinder axis into which you drop a finished cartridge. If all cartridge dimensions are inside the max spec the cartridge will fit and drop out easily and should work in your pistol. If the cartridge is out of spec for head space, case width or overall length it won't fit properly into the gauge.
Suggest also getting a factory crimp die which will let you fine tune the taper crimp of the case mouth. Has the added benefit of doing a final resize to assure width is right along the whole length of the case.
Hope this helps.