https://www.opgenorth.net/handloading/Recent content in Handloading on Opgenorth.NETHugoen-caMon, 02 Mar 2026 08:29:55 -0700https://www.opgenorth.net/handloading/6x45/Mon, 02 Mar 2026 08:29:55 -0700https://www.opgenorth.net/handloading/6x45/<h2 id="what-is-it">What is it?</h2> <p>The 6x45mm (also known as the 6mm-223 or 6mm/.223 Remington) is a wildcat cartridge created by necking up the standard .223 Remington / 5.56x45mm case to accept 6mm (.243&quot;) diameter bullets. While never standardized by SAAMI in the United States, it was officially standardized in Europe by the CIP as the <strong>6 x 45</strong>.</p> <h2 id="history">History</h2> <p>The cartridge originated around 1965, shortly after the commercial introduction of the .223 Remington and the U.S. military adoption of the 5.56x45mm cartridge. Benchrest shooters and hunters sought to enhance the ballistic efficiency and terminal performance of the compact .223 case by loading heavier 6mm projectiles. It became popular during the late 1960s and 1970s, particularly in benchrest shooting, because it has mild recoil, low powder consumption, extended barrel life, and exceptional inherent accuracy.</p>https://www.opgenorth.net/handloading/8x57/Fri, 28 Sep 2018 09:09:54 -0700https://www.opgenorth.net/handloading/8x57/<p>The 8mm Mauser (7.92x57mm) round, in it&rsquo;s current incarnation, has been around since 1903. It is a improvement of the original 7.92x57mm cartridge that was developed in 1888 by Peter Paul Mauser. Arguably, 8mm Mauser has been one of the world&rsquo;s most popular cartridges, having seen significant military and civilian use over the past 100+ year. It also influenced the design of many of today&rsquo;s cartridges, such as .30-06.</p> <p>Finding good 8mm Mauser ammunition (in Canada at least) is becoming harder. The glut of military surplus rifles and ammunition for this cartridge is long over, and there are more modern cartridges which have gained a significant following.</p>