Lyman Products 300 AAC Blackout Case Length Headspace Gauge

I'm not an expert (3 years reloading experience) so I may get some terminology wrong. Hopefully the pictures that I attach will clarify my review.I believe these .300 blackout case gauges are "out of spec". The fault seems to be where the shoulder of the case should determine headspace. When I drop a known good case in, it falls in too deeply.I used a "Sheridan Engineering" case gauge to determine the "good" status of the case. Last 2 pictures attached.I've used .223; 9mm; .380; .40S&W Lyman gauges all with great success. This 300blk not so much.I contacted Lyman and they sent me a free replacement. Same exact results.

I was reloading on a single stage press (very labor/time intensive) and ended up having my die set ever so slightly off. I cranked out 200-300 rounds with this off. My COAL was on point but my neck was off and wasn't chambering correctly. Unfortunately, I found this out while at the range with my family from out of town. Needless to say, it was a pain to figure out and a little embarrassing. All that said, If I would have had this and checked every 25 or even 50 rounds, I wouldn't have had a problem. I now add this step to my "QC program" and I regret trying to save the little money it actually cost to buy. I will buy this for every caliber I reload.

I purchased 1000 pieces of American Eagle brass and every one of them sits below the minimum headspace. I thought it was a fluke until I stuck some Hornady factory ammo in the gauge and saw the same result - .005 low of the minimum headspace. On the bright side, the overall length is dead nuts.

So, I have several Lyman headspace caselength gauges and this one falls short of its intended purpose. I have tested 300 blackout cases that are below the maximum .378 case casehead thickness and they will not fit in the gauge. The only case length headspace gauge that will give you an accurate reading for 300 blackout cases is the l.e. Wilson gauge. Don't buy this one, get the L.E. Wilson Case Gauge!

I was struggling getting my 300 blackout to run properly on my cut down 223 brass till I bought this and found it took 3 hits in the sizer die to properly headspace the brass

An essential tool for anyone that reloads this caliber; especially if using once-fired military ! Once resized, the gauge quickly determines if the case needs to be trimmed or not!AND as if that's not enough, it will also check the completed cartridge to ENSURE it will chamber!! IMHO, an absolute must for this caliber!

If you are new to the reloading world, this product is a MUST for reloading the 300 blkout for semi auto use. It functions as a case size gauge and I also use it after the round is reloaded to check chamber fitment. If the bullet fits in this and meets to tolerances, it fires consistently in my semi automatic

This is made well and easy to use. Checks for max/min headspace and length. You definitely want one of these on your bench for quality control if you take the time to convert your own cases to 300 BLK.

I have a few of these in different calibers. They're a a great tool for every reloader.

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