Note some (many?) folks may have difficulty sourcing the same size & type primer as used in the published load recipe, much less same brand.When starting load development, follow the receipe/load data in the source, such as if the manual states 205 or 205M, use that primer as a starting point. After you find a load that works good in your firearm, you can try different primers to see if a primer change is better or not, just be aware that any change in components can cause different issues, especially at max or close to max powder charges.