.30 Cal Berger Bullets

We use only the highest quality copper and lead available to eliminate impurities or other material issues.  Our material vendors have been in their industry for decades.  We have regular meetings at their facility and ours to refresh our mutual understanding of our highest material quality requirements.

We use a specially developed process which includes custom made gauges to ensure reliable and repeatable measurements. All jackets, cores and bullets within a given lot are made with one die to guarantee consistency.

Each bullet is made on a die that is designated for that bullet.  This die is set aside and used again for all lots until this one die wears out. All tooling is precision made using dimensional tolerances in the .00005.  Using precision-made tooling is an absolute requirement.  The companies who make our tooling are specifically in the precision tooling business.

J4 Precision Jackets are the only bullet jackets in the world known for less than .0003 total wall thickness variation on every size and lot.  This has been true for decades and is provable by checking any lot.  There are those who claim that they can meet this tolerance and we know that they can every once in a while, but to do this with every single lot is something that only J4 has perfected.  This is an absolutely critical aspect of precision bullet performance and we are the only bullet company with this capability.