300 whisper = pita

[cherokee]

I had the same problem with brass from davis. I found that I had to resize the brass twice before loading it (Turning the brass 180 deg between passes)then it fits in the chamber. Once it has been fired in the weapon it works well. Maybe his resizing setup needs some adjustment. I would still buy brass from him again. His brass is reasonably priced and it saves me the hassle of making it my self.

[Cornholio]

I must have spoke too soon. I just received an email from Mr. Davis. He was out of town. I'm looking forward to trying out his brass!

BTW, what is stamped on the Model 1 barrels?

Mine is stamped (rather sloppily) "SS 300 FB" on the top of the barrel half-way down the length, and "300 FB 1/8" on the bottom near the chamber. Supposedly, it was an Armalite barrel, but I have never heard of Armalite making .300 Fireball barrels.

[Cornholio]

Originally Posted by cherokee

I had the same problem with brass from davis. I found that I had to resize the brass twice before loading it (Turning the brass 180 deg between passes)then it fits in the chamber.

Damn, what gun are you using? That is one tight chamber!

[800X]

OK,

Back from the range.

I trimmed 10 of the CorBon empties (lake City brass) and 15 of Mr. Davis's brass to a length of 1.345". All were resized once more for good measure and loaded with Sierra 220gr MK over 10.1 grains of H110.

The good news is that everything fed beautifully. I was impressed with the smoothness. I really think that I have solved this issue finally.

The bad news is that this upper (my buddies) would not cycle completely. I'm back to the same issue where it won't strip the next round. I had this same problem with the first two barrels I bought, and I finally had to move the gas block back to correct it. The first of these replacement barrels (my upper) cycled perfect right out of the box this time around. This means that 3 out of 4 M1S barrels will not quite cycle. Before I put my foot in my mouth on this issue, I will play with the upper a bit more.

So problem one is finally solved. From now on I will trim all my brass to 1.345. I think it is strange to have a cartridge with so many listed trim lengths but I know this works and I won;t be looking back.

[800X]

Also, I wanted to add that I measuded the neck diameter of all my rounds before I left. The CorBon, the 221, and Mr. Davis's brass all measured between .329 and .333. Remember I had measured my chamber neck to be .336. I found the spread between all three types to be about the same. I have no idea if CorBon neck turns but none of the brass was too thick. I was planning on keeping track of neck diameter while I shot so I could see if the larger necks were causing problems, but the perfect record today has made this a moot point.