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the difference between a magnum primer and a regular primer for some companies is how much of the primer mix they put in the primer cup. Over the years Handloader magazine has published some tests of primers. The results show that some companies regular primers are as hot as other companies mag primers. The primer cup may also be thicker to withstand higher pressure and this can cause uncertain ignition with pistols having weak or 'tuned' hammer springs. If I could not exchange the primers for the correct ones you can probably use them with no problem. As said before reduce the powder charge to the minimum listed and start up from there.
The crimp you use might be more important with a mag primer generating more initial pressure and starting the bullet out of the case before best ignition is estableshed.
Yes there is a difference between ignition and bad ignition. If you chrono your loads and have a weak hammer fall the SD of your loads will be higher. Handloader magazine had an article about insuring your firing pin spring was strong enough for good ignition.
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