Problems with 300AAC Rifle

[ugaarguy]

If the bullets are hitting the rifling then it's almost certain that the cartridges are loaded too long. S&W chambers the rifles in .300 BLK not .300 Whisper. You're putting your faith in a little known ammo maker properly sizing their reloads and you believe that S&W has short chambered your rifle. Regardless of the probabilities, the only way to know for sure is to get a case gauge and to check cartridge OAL with a micrometer.

 

[Rusty Luck]

So I was looking back at my order form and it states on it "S&W 300 Whisper". I'm gonna take the reloads to a gunsmith I know and have him check the dimensions irregardless. Thing is he's in a town 5+ Hours from here so I haven't made it there yet.

 

[ugaarguy]

Correct. S&W calls it a .300 Whisper that's .300 BLK capable. It's still chambered for .300 BLK. It's much like some of the Colt Sporters that were marked .223 Rem on the receiver, but actually chambered 5.56 NATO and marked 5.56 NATO on the bbl. It's weird, but sometimes gun makers do it.

 

[kilibreaux]

Your ammo is "sticking" in the chamber. It could be case necks are too long, or if using converted brass, case necks are too thick, or their is a crimp that has caused the neck BEHIND the crimped area to bulge outward. The force of chambering is causing your rounds to "stick" due to being dimensionally outsized.
IF...I say, IF the bolt is fully closed, you can fire the rounds without worry, and it is certainly easier than trying to snatch them back out manually using the charging handle...been there done that with my .300!

 

[carbine85]

I had to brace with my feet and use 2 hands to pull on my extended ambi charging handle. The gun has yet to be fired

The easiest way to clear this failure is to:
1) Hold the rifle by the hand guard.
2) Use the other hand and pull back on the charging handle.
3) Bang the end of the butt stock stock on the table, ground, or knee.
It should clear out.
I think your problem is C.O.L. or the neck of the case is bulged or sized incorrectly.

 

[jerkface11]

The easiest way to clear this failure is to:
1) Hold the rifle by the hand guard.
2) Use the other hand and pull back on the charging handle.
3) Bang the end of the butt stock stock on the table, ground, or knee.
It should clear out.
I think your problem is C.O.L. or the neck of the case is bulged or sized incorrectly.

If you have a collapsible stock make sure to collapse it all the way before doing this.

 

[jerkface11]

I'm willing to bet that the ammo is at the COAL for .300 blk but the the bullet has a different profile putting the bearing surface further forward.

 

[68wj]

So I was looking back at my order form and it states on it "S&W 300 Whisper". I'm gonna take the reloads to a gunsmith I know and have him check the dimensions irregardless. Thing is he's in a town 5+ Hours from here so I haven't made it there yet.

A cartridge headspace gauge ordered online is cheaper than gas. Still sounds like headspace before COAL, but without measurements it is all a guess.

 

[hentown]

Okay so I bought a box of new Hornady 300 whisper/blackout (as said on box) it is a little shorter and chambers/feeds/ejects easily/well. This leads me to think that the rifle is made for "whisper" and not "blackout" as previously suggested.

My new question is: How do I or what do I need to do to make it take all 300AAC ammo? Can I do it? Should I take it to a gunsmith to do it? Thanks.

I don't mean to be insulting at all, so please don't take this as an insult, but your question in this quote is nonsensical and not really even germane to this thread.

I suspect that you've been given the correct answer by me and a couple of other guys. You've bought out-of-spec reloads. It really is that simple.

Either buy some reloads from Danny Cooper or load some of your own. This ain't rocket science. Get a case gage for setting up your sizing die.

I have yet to have a problem with any of the .300 Blackouts that I've loaded, and they all shoot one-hole groups @ 100 yds.

I feel that you've been given the answer to your "problem," but you don't seem to be willing to accept the answer.

 

[Rusty Luck]

Hentown you are probably right. It's just annoying to pay for something and not get what you expect. Here are a couple pics of it side by side with a factory round.

 

[Davek1977]

That's why, is you had asked here, nearly every person who answered would tell you to avoid "gun show reloads" at all costs. Sometimes, "cheap" isn't worth your money. Simply put, re-manufactured ammo is a complete crap shoot. You have no idea who loaded them, under what conditions, or how much care was taken in the process. You maybe have a OAL that varies considerably from round to round, you may have powders that range from less than idea to downright dangerous, etc. You just never know, and my guns, and my life, are valuable enough to me I won't take that kind of gamble, nor would I suggest anyone else do so. Other than Blue Box Black Hills loads, I will not fire re-manufactured or reloaded ammo. It sucks that you got ripped off, but listen to the knowledgable answers you've gotten here rather than try to over-complicate the issue by insisting your ammo is in spec when you haven't so much as measured it yet. Out of spec reloads seems to be the problem....now accept that as an answer and move on, barring any other oddities NOT related to your batch of reloads!