How to make 6mm Mongoose brass

Forming 6mm mongoose brass from virgin 223 starline brass by using an expander mandrel and the mongoose die.

[@Mike-xi4zt]

If you trim as the first step you probably won't have to chamfer the case mouth after expanding the neck and sizing the outside of the neck after trimming

[@barrygrant2907]

I just lube the cases with Imperial case lube and run them through the Mongoose resizing die, then trim. Haven't had a problem yet. I have started to anneal the cases after each firing to lengthen case life. The Analeze annealer makes it simple.

[@theaveragereloader7222]

You won’t have a problem doing it I did the same when I first started with the cartridge 4 years ago. What I didn’t like is the little bubble it leaves around the shoulder where it meets the case body wanted it to be more uniform that’s how I came up with this process. I’ve heard of others kind of doing something similar so I gave it a shot with my own touches and it works great.

[@brittangolden3105]

I make my .277 wolverine with a 3 step process. Spray One shot on 5-10 pieces of .223/5.56 brass take my .277 WLV sizer die then use a decent small pipe cutter to 1.54 then chamfer/Debur. Makes perfect formed .277 Brass. I used to precut them with the harbor freight but I like being able to do the full process with out using power tool.

[@flintstone9846]

Looks same as 6mm tcu

[@concernedaussie1330]

What advantages does the 6 mm mongoose have over 6x45 or other cartridges in this same ballpark??? Thanks

[@theaveragereloader7222]

The mongoose can handle higher pressures and has more case capacity than the 6x45. Usually when working up a load my starting charge is 6x45 data and then I go up 1.5-2gr over that if the case fill will allow it.

[@concernedaussie1330]

@@theaveragereloader7222 thanks mate

[@gustavocunha9793]

​@@theaveragereloader7222 Hi. Forgive me, because my english is very bad... 6x45 mm ammo still made in US?

[@treece1]

​@@gustavocunha9793not that I'm aware of

[@grahamugalde9703]

So that a quick way to imitate the 6.5 tcu.

[@theaveragereloader7222]

No idea but if it works then it’s a multi cartridge video I guess. I’ve heard the tcu named but never looked into it.

[@HitManHepler1]

What's the cartridge in the silver tray?

[@theaveragereloader7222]

I believe that is my 6mm lynx ai

[@peterschmidt2849]

🤙🏻🔥🇺🇸