350 Legend bullet testing

Rickt300

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Yeah. I found all of the book data I had to be grossly understating the velocities I was getting. I thought maybe I just had a “fast barrel” but I’ve had a couple 16 inch ARs in 350 and all were basically the same. I know of a few people using the 357 180gr, you’ll just want to work up slow since “technically” the rifle is made for .355 instead of 357. I know of a few people who just size the 357 down to 355, and some that run it as is.
I can run it as they come out of the box but will size these down to .356. Actually the bore diameter is the same for either a 357 magnum or a 9MM. But in the interests of slicker chambering .356 is what I size all the bullets I run in my Legend.
 

Moparman485

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I can run it as they come out of the box but will size these down to .356. Actually the bore diameter is the same for either a 357 magnum or a 9MM. But in the interests of slicker chambering .356 is what I size all the bullets I run in my Legend.
Right. The main hiccups I’ve heard about with regard to the 350L have to do with the chamber in the portion where the bullet would sit pre-firing. Two of my prior ARs had no issues chambering .357s, but my Ruger and 3 other ARs would not chamber without excessive force or bullet setback. But they ran .355 diameter (and plated .356) just fine. Would’ve been much simpler if they had made it to run .357 from the outset.
 

Rickt300

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It is really not that big a deal, many good .357 and .355 bullets out there and it is a great cast bullet round. You can size jacketed bullets just like you can cast.
 

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