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What was the technique that the Sierra tech rep gave you? If it gave you an accurate measurement of your maximum OAL with that particular bullet then the answer to your question is no, the rounds you loaded should cause no problems assuming there is enough bullet left in the case to hold it hard and straight.
The SAAMI max OAL is a standard so that any factory round for any given caliber will work in [almost] any gun chambered for that caliber. It is certainly an excellent place to start, but if you do your homework and know exactly what you are doing and the signs to look for (and the consequences) if you do something wrong, then you can tailor your cartridges to your particular rifle. The homework part is very important and it certainly sounds like you're doing that.
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