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Additionally, a round off the top of the mag can be another cause of incorrect stripping. Thus, the extractor is the source of incorrect chambering.

Everything is good if you manually “hook” a round into the bolt face, slip it under the extractor, and hold it in place the bolt locks correctly. On closer inspection, you can see that the extractor is not moving over the rim of the round. Knowing the reasons behind the problem can help you solve it. The bolt does not strip and feed a round, and it will not shut on a round when manually inserted. Many of the users have complained about the striping issue. Lag of accuracy Go for the better quality of ammo. Bolt Issues Make sure to polish the bolt properly. Magazine Issue Make sure to remove the springs. Changing the extractor detente ball to a little larger one (3.5mm) can solve the problem. Cannelures provide positive case crimp, making Sub-X® ideal for semiautomatic weapons.Ruger American Ranch 7.62×39 Problems Common Ruger American Ranch 7.62×39 Problems and Solutions Problems Solutions Stripping Issue Manage to get a replacement extractor claw. Long grooves in its gilding metal jacket combine with its flat profile and the patented Flex Tip® insert within the bullet’s hollowpoint cavity to help it expand reliably at low velocities. Sub-X® (Subsonic - eXpanding) bullets deliver big results without a big bang! Designed to provide deep penetration below the speed of sound, Sub-X® features a lead core. Hornady described the Sub-X line as follows: Powders are selected for optimal performance and consistency from lot to lot. Long grooves in its gilding metal jacket combine with the bullet’s flat profile and the patented Flex Tip® insert within its hollowpoint cavity to help it expand reliably at low velocities. The Sub-X bullet used in Subsonic Rifle features a lead core. Subsonic Handgun utilizes tried-and-true XTP® bullets that expand reliably at subsonic velocities.

Hornady® Subsonic Ammunition - designed for accuracy and performance below the speed of sound - now comes in both rifle and handgun loads. The following quote is from Hornady’s website, which is followed by their video showcasing the subsonic 7.62×39 in action.

Short Barrel Soft Point Showdown: Hornady Black HD SBR Review.

11th Edition Hornady Handbook of Cartridge Reloading.

CX Bullets – Hornady’s NEW Monolithic Copper Alloy Expanding Projectiles.

Hornady 30 Super Carry Critical Defense Ammunition.

308 caliber bullets under the Sub-X line, though they’ve now also listed. For the moment, it appears that the 255-grain 7.62×39 projectiles only come as part of their factory-loaded subsonic cartridge series, while the rest of the Sub-X lineup are available as just the projectiles. The Sub-X bullets utilize the familiar red-nosed expansion tip, but these tips have been enlarged to enhance the bullet’s expansion at much lower velocities. Despite the launching of many 7 PRC rifles and loadings at the end of October, Hornady quietly launched an updated lineup of their Sub-X bullets, as well as their subsonic 7.62×39 loading using said Sub-X bullets.