Deluxe 300 Blackout Case Trimming Jig

I purchased 1 of these a few years ago for a family member. We have used it to process a couple thousand cases so far. It works exactly as it should. Setting the jig up on the saw is very crucial to get right. Once the jig is set the process is very simple and time saving. I moved out of state therefore I had to buy another me. I haven't used it yet but it's the same as the original and will work great.

This cutter will get you close, then use the fine trimmer to get you dead on. You can make a lot of 300 bo very quickly with this jig. It's a great design that is simple and just works.

Does exactly what it’s suppose to do.

This isn’t my job, but since this worked so well for me I think this is in order. And also apparently because some folks whom are mechanically inept are trying to make ammunition…1. Use a known square material to set the vise perfectly square on your saw and firmly tighten the vise screw on the left.2. Mark the length you want (1.365 for me) on the sized .223 case3. Bring the saw blade down to just clear your mark while holding the jig in place so it cant tilt at all, firmly tighten the vise4. Apply loctite to the cap screw in the jig and adjust it to prevent excess down travel from cutting the jig. Do this by hand and let the loctite cure. (The hex in the screw is an oddball and hard to reach once mounted)5. Put the brass in and while pulling it back to the jig stop, hold it down firmly (you want to avoid chatter while cutting). Saw away.6. Measure your results.The saw has a little bit of play left and right so you should give yourself a little extra length on your cut case. This is not a trimmer, this is a cutting jig. You should trim to exact length elsewhere. You’re welcome.

Works as it should!

Cuts brass so trimming is faster. Try putting a already trimmed case next to blade to get very close to where one needs to cut.

The current ammo shortage extends to getting reloading components like brass, and I had been having a hard time finding cases for the .300 Blackout. And when I could find it, it was hideously expensive. I knew I could "make my own" brass for the .300 simply by cutting down .223 Rem./5.56x45mm NATO brass, and this jig is exactly what I needed. This particular one is what I call the "no frills" version. It's smaller than the other ones I've seen, but it turns out I like this one better than I would have the larger ones. It's extremely easy to get set up, and with my particular chop saw, I have it mounted more or less permanently in place, so I never have to worry about getting cases trimmed very close to the overall length I need. I only wish the little clear plastic handguard would snap into place. It's easy to knock it off or out of place. The only other drawback is that the shorter length jig lets the sawed-off "nibs" bind or jam up, and not slide continuously until they fall out the end and into the collection bucket I keep on the floor. For the price, and for what it does, it's money very well spent. It frees me from being hostage to the brass shortage everyone else is enduring.

I am fashioning 300 ACC Blackout brass cartridges from spare 5.56 brass. As part of that process, I needed to cut-off the 5.56 cartridge at the base of the shoulder for the next step in case-forming. This jig is precisely what I needed. There are a few of them out there, but I settled on this one because it is USA made, and seems to be easy to use.In using it, I found that it is very easy to use, and helps you make a good cut every time. Just index the case base against the small protrusion, and cut the case. The jig holds the case upward in a good orientation, and it is snug enough to hold the case straight during the cut.It has a cut-depth stop (small screw) on the top of the jig which is compatible with some of the smaller cut-off saws. I have decided to use a larger cut-off saw, so I didn't use that screw. One thing to be careful of is allowing the cutting saw to go too deeply past the bottom of the case. You want to keep the saw off the bottom shelf under that part of the jig.This jig has allowed me to cut cases in an interval of about 5 seconds each. There is a nice removable plexiglass guard which helps you keep your fingers away from the cutting wheel, as well.