SK SEMI-AUTO RIFLE .22 LR 40 Grain Lead Round Nose – 50 Rounds (Box) 420148

SK Semi-Auto Rifle .22 LR is purpose named for a reason, and for good reason it has a loyal following. This is dependable .22 LR ammunition from SK loaded specifically to cycle self loading rifles, pushing a 40 grain lead round nose bullet from a brass case. Each box holds 50 rounds and the catalog number is 420148.

Most rimfire ammunition is loaded for general use and left to sort itself out in whatever gun it lands in. This one was developed around a specific problem, which is getting a semi automatic .22 to run cleanly and accurately at the same time.

What SK Semi-Auto Rifle Ammunition Solves

Self loading rimfires need a certain amount of energy to work the bolt fully. Loads that are too gentle short cycle, fail to eject and stovepipe, while loads that are too hot batter the action and open up groups.

This load is tuned for that middle band. It carries enough impulse to run a blowback action reliably while staying accurate enough to shoot serious groups, which is a combination cheap bulk ammunition rarely delivers.

It suits anyone shooting rimfire competition on a semi automatic platform, rimfire steel challenge shooters, and owners of .22 conversion uppers and dedicated trainers. It is equally at home in a bolt gun if you just want good ammunition.

Key Features

• 50 rounds per box in the familiar SK packaging
• .22 LR chambering, the classic low cost training round
• 40 grain lead round nose, the standard projectile weight
• Loaded specifically for reliable semi automatic cycling
• Brass cases you can collect and reload if that is part of your routine
• Manufacturer model 420148 for straightforward reordering

The Specifications and What They Deliver

Forty grain is the reference weight for .22 Long Rifle, so this load shares a trajectory and a general point of impact with the majority of rimfire ammunition on the market. Switching to SK Semi-Auto Rifle from another 40 grain load rarely means a dramatic zero shift.

The lead round nose profile is the most feed friendly shape in rimfire. In a semi automatic that matters more than anywhere else, because the round has to travel from a magazine, up a ramp and into a chamber under spring pressure every single time.

Brass cases eject cleanly and resist the corrosion that plagues cheaper case materials in storage. Collect them if you salvage brass, or sweep them up and be done.

Fifty rounds per box is the standard rimfire count, and it works well here. A box is a stage or two of competition, or a solid accuracy session with rounds left for fouling shots.

Practical Use, Care and Compatibility

Any .22 Long Rifle chamber will take this ammunition. If your semi automatic has been short cycling or failing to lock back on the last round with bulk ammunition, this is the first load to test before you start changing springs or buffers.

Give a new rifle a proper break in with it. Rimfire barrels often settle down after a few hundred rounds, and the groups you see at round eight hundred are frequently better than the ones you saw at round fifty.

Bare lead bullets do build fouling, so run a bore snake through every few hundred rounds and do a solvent cleaning at the end of a heavy day. Keep the chamber and extractor clean too, since a dirty chamber is the most common cause of rimfire extraction failures.

Store boxes cool and dry, off bare concrete, and buy deeper than you think you need. Our full ammunition selection carries plenty of alternatives to test alongside it in your own gun.

If your autoloader has never quite run right, SK Semi-Auto Rifle ammunition is the cheapest fix you can try. Buy a couple of boxes and find out. This ammunition ships straight to your door wherever state and local law allows.