Sounds like its pull the bullet time and start over to me...That's why you only load a few till you get the kinks worked out....Been there done that.... made that mistake...several times
Small Base Sizing
Some firearms will require that fired cases be returned to approximately unfired dimensions. This is the purpose of the so called small base sizing die. In essence, this is nothing more than a standard full length sizing die, which has been reamed to absolute minimum dimensions. Tight chambers, a lack of camming power, or a combination of these may require cases to be sized to these smaller dimensions to assure positive chambering. As we have noted, most conventional full length sizing dies reduce a case’s fired dimensions enough to allow the case to be easily rechambered, without bringing it down to its original, unfired dimensions. In some instances, this will not quite be sufficient to assure positive operation and functioning. This most often occurs in firearms that lack the camming power of a bolt action, such as semi-autos, pumps, and lever actions. Sierra has worked with a large number of these types of firearms that functioned perfectly well with conventional full length dies, and suggest resorting to small base dies only if they prove to be necessary. They do work the brass more, and will usually result in reduced case life.
Die adjustment for a small base sizing die is exactly the same as for a full length sizing die, but special emphasis should be paid to avoid exceeding allowable headspace dimensions. Chamber type case gages, such as those available from L.E. Wilson, or micrometer gages like the RCBS Precision Case Mic are extremely useful in adjusting small base dies.