There is no risk in trying. Magnum Primers are there to ignite large volumes of powder in Magnum calibers. They ignite powder faster as they have a larger flame. If you substitute with a LR primer, the ignition is slower. This will create lower pressure so there should be not risk.
However, it can have the following negative impacts but you have to try if in your specific case they are relevant. If not, I would continue with LR primers:
Slower powder brun leading to overall lower powder conversion
subsequently to lower muzzle velocitiy
subsequently to lower energy and a different trajectory
can also lead to more incensistant powder brn impacting precission of your loads
BUT AS SAID - no risk in trying.
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There is no risk in trying. Magnum Primers are there to ignite large volumes of powder in Magnum calibers. They ignite powder faster as they have a larger flame. If you substitute with a LR primer, the ignition is slower. This will create lower pressure so there should be not risk.
However, it can have the following negative impacts but you have to try if in your specific case they are relevant. If not, I would continue with LR primers:
Slower powder brun leading to overall lower powder conversion
subsequently to lower muzzle velocitiy
subsequently to lower energy and a different trajectory
can also lead to more incensistant powder brn impacting precission of your loads
BUT AS SAID - no risk in trying.