06-22-2020, 01:32 PM
The SAAMI chambered barrels produce good accuracy with most any bullet if your using a quality barrel. There has been considerable confusion on the nomenclature surrounding the 6.5 Grendel. The SAAMI chamber uses a compound angle throat compared to many traditional tapered throats in rifle barrels. The compound throat proved to be the most accurate and versatile chamber when Bill Alexander was doing product research before releasing the 6.5 Grendel.
A traditional chamber is used in the 264 LBC but this chamber is open source non SAAMI accepted design. Les Baer introduced the 264 LBC and advertised it was optimized for the 123 grain SMK. Black Hole Weaponry (BHW) now Columbia River Arms has sold a lot of 264 LBC barrels. BHW coined the term Type I for barrels chambered to use .125 bolt face depth (7.62x39 bolt) and Type II for .136 6.5 Grendel bolt.
To add confusion Satern/Liberty released Grendel II barrel with traditional throat with long free bore to accept long 6.5/.264 bullets. In my opinion the tolerances are not as critical on the traditional chambers and might be why some manufacturers turn out numerous out of spec 6.5 Grendel SAAMI chambers.
Lothar Walther sell a 6.5 CSS barrel, Model 1 Sales offers a 6.5 Sporter chamber plus Anderson sold a Grendel 1 chambered barrel for a short time. All these barrels shoot 6.5 Grendel ammunition but the market has been moving to the SAAMI spec 6.5 Grendel chamber. Bear Creek Arsenal who has produced a lot of 6.5 Grendel barrels has quietly quit using the SAAMI Spec 6.5 Grendel chamber.
If a manufacturer uses quality reamers and hold to close tolerances they can manufacture accurate SAAMI spec 6.5 Grendel barrels. Mass produced high volume manufacturers tend to have a lot more out of spec chambers with accuracy problems in the 6.5 Grendel barrels compared to 5.56/223 barrels.
A traditional chamber is used in the 264 LBC but this chamber is open source non SAAMI accepted design. Les Baer introduced the 264 LBC and advertised it was optimized for the 123 grain SMK. Black Hole Weaponry (BHW) now Columbia River Arms has sold a lot of 264 LBC barrels. BHW coined the term Type I for barrels chambered to use .125 bolt face depth (7.62x39 bolt) and Type II for .136 6.5 Grendel bolt.
To add confusion Satern/Liberty released Grendel II barrel with traditional throat with long free bore to accept long 6.5/.264 bullets. In my opinion the tolerances are not as critical on the traditional chambers and might be why some manufacturers turn out numerous out of spec 6.5 Grendel SAAMI chambers.
Lothar Walther sell a 6.5 CSS barrel, Model 1 Sales offers a 6.5 Sporter chamber plus Anderson sold a Grendel 1 chambered barrel for a short time. All these barrels shoot 6.5 Grendel ammunition but the market has been moving to the SAAMI spec 6.5 Grendel chamber. Bear Creek Arsenal who has produced a lot of 6.5 Grendel barrels has quietly quit using the SAAMI Spec 6.5 Grendel chamber.
If a manufacturer uses quality reamers and hold to close tolerances they can manufacture accurate SAAMI spec 6.5 Grendel barrels. Mass produced high volume manufacturers tend to have a lot more out of spec chambers with accuracy problems in the 6.5 Grendel barrels compared to 5.56/223 barrels.