The Sig has a rather short case neck. Round nose, long ogive bullets meant for the 9x19 or the .38 Super have a relatively short bearing surface. Depending on the bullet you are using, there may not be much of the bullet actually contacting the case neck. These are not considered safe for loading the Sig as they may be pushed back into the case during the loading cycle, causing excessive pressures.
The 125 grain Speer Gold Dot designed for the Sig has a proper length full diameter bearing surface. Other bullets that work well for the Sig are the Hornady 124 gr XTP and 125 gr HAP. Both work well in my .357 Sig loads as well as the Speer GD you mentioned above.
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