yes it is,but with the extractor holding the case back against the bolt face, i have had no problems at all and if that worries you seat the bullet out to just meet the lands. in the .223 ackley improved the regular .223 fire forms the shoulder forward with out any problems in my rem 700 push feed action. always better to use the case made for the caliber if available. and most are today if you want to spent the money, i enjoy making them my self. eastbank.