What do y'all think about this S&W 300 whisper upper. Updated.

I was mainly looking at it since it's a 300 whisper.

Whisper shoots both 300 whisper and 300 ACC blackout.

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You sure about that interchangeabilty?

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Look above you. Wasn't sure which was which.

LC

I had the camo s&w 300 whisper. It was very accurate and I wanna say it shot the blackouts too. I ended up selling it to get my benelli. My new blackout shoots the whispers and blackouts for sure but it's not a s&w, it was "custom made" by a guy in Alabama.

Nick

300 AAC Blackout and 300 Whisper ™ are not the exact same thing. It is similar to .223 vs 5.56mm in that the difference is in the neck of the cartridge.

300 AAC Blackout is SAAMI spec cartridge whose origins come off the 5.56mm case and cartridge case drawings and chamber drawings are available from SAAMI for the round and in fact are available to anyone right on line. [Click here.]

300 Whisper ™ is a Wildcat cartridge based on the 221 Fireball case and there is limited information out to the public or manufacturers in the way of cartridge drawings or chamber drawings. 300 Whisper ™ has traditionally been a round oriented toward handloaders and there is a lot of reverse engineering done out in the marketplace. There is not a published “Standard” for 300 Whisper ™ chambers and cartridges. As such, we cannot tell customers that you can shoot 300 AAC Blackout ammunition in a 300 Whisper ™ chambered firearm, or that you can shoot 300 Whisper ™ ammunition is a 300 AAC Blackout chambered firearm.

Our recommendation is that if a consumer want to cross ammunition and chambers with these two caliber, that they have the ammunition and firearm checked by a qualified Gunsmith to assure it can be done safely.

Thanks,
John Hollister | Sales Manager
Advanced Armament Corp.

If I’m reading this right, basically what John is saying is that because the .300 Whisper round isn’t a “standard” cartridge the chamber pressures of a particular Nick

300 AAC Blackout and 300 Whisper ™ are not the exact same thing. It is similar to .223 vs 5.56mm in that the difference is in the neck of the cartridge.

300 AAC Blackout is SAAMI spec cartridge whose origins come off the 5.56mm case and cartridge case drawings and chamber drawings are available from SAAMI for the round and in fact are available to anyone right on line. [Click here.]

300 Whisper ™ is a Wildcat cartridge based on the 221 Fireball case and there is limited information out to the public or manufacturers in the way of cartridge drawings or chamber drawings. 300 Whisper ™ has traditionally been a round oriented toward handloaders and there is a lot of reverse engineering done out in the marketplace. There is not a published “Standard” for 300 Whisper ™ chambers and cartridges. As such, we cannot tell customers that you can shoot 300 AAC Blackout ammunition in a 300 Whisper ™ chambered firearm, or that you can shoot 300 Whisper ™ ammunition is a 300 AAC Blackout chambered firearm.

Our recommendation is that if a consumer want to cross ammunition and chambers with these two caliber, that they have the ammunition and firearm checked by a qualified Gunsmith to assure it can be done safely.

Thanks,
John Hollister | Sales Manager
Advanced Armament Corp.

If I’m reading this right, basically what John is saying is that because the .300 Whisper round isn’t a “standard” cartridge the chamber pressures of a particular ammunition might be too much for a .300 BLK chamber to handle. Might. Possibly. Depending on the ammunition and its manufacturer. The lack of a proper specification for .300 Whisper means that some ammunition may be loaded “hotter” than normal and still be called .300 Whisper, leading to an unfortunate surprise that could blow up your gun.

Thanks to that caveat it does appear that firing .300 Whisper out of a .300 BLK firearm is possible if you get the right ammunition, as John’s closing paragraph seems to indicate. .300 Whisper WILL fit in a .300 BLK chamber (assuming the cartridge is loaded to spec), the only question is whether it will blow up on you when you pull the trigger.

The best method to avoid an explosive and bloody death when using .300 Whisper in a .300 BLK gun is to load your own ammo. And honestly, if you’re already loading .300 Whisper it’s $30 worth of reloading dies before you can swap to .300 BLK. By loading your own rounds you can ensure that your maximum load never exceeds the recommended maximum load for .300 BLK and thus be able to use the same ammunition in both firearms. might be too much for a .300 BLK chamber to handle. Might. Possibly. Depending on the ammunition and its manufacturer. The lack of a proper specification for .300 Whisper means that some ammunition may be loaded “hotter” than normal and still be called .300 Whisper, leading to an unfortunate surprise that could blow up your gun.

Thanks to that caveat it does appear that firing .300 Whisper out of a .300 BLK firearm is possible if you get the right ammunition, as John’s closing paragraph seems to indicate. .300 Whisper WILL fit in a .300 BLK chamber (assuming the cartridge is loaded to spec), the only question is whether it will blow up on you when you pull the trigger.

The best method to avoid an explosive and bloody death when using .300 Whisper in a .300 BLK gun is to load your own ammo. And honestly, if you’re already loading .300 Whisper it’s $30 worth of reloading dies before you can swap to .300 BLK. By loading your own rounds you can ensure that your maximum load never exceeds the recommended maximum load for .300 BLK and thus be able to use the same ammunition in both firearms.

I read that a bit ago. Still find it odd. I haven't looked up the specs in a while but the 300BLK is considerably in psi than the 300 whisper. Also, why would you want an upper that is not SAAMI approved?

Just read all that above. Looks like I may have my information backwards.

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might as well go ahead and get one chambered .223/5.56.

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Exactly. However, have you seen how rare 300BLK is these days? Good luck finding 300 Whisper. Plus, any name brand whisper will be well within blackout specs.

Still don't know how I feel about getting an upper chambered in a non SAAMI approved caliber.

I have been getting my 300 BLK ammo from this website.

LINK

You can sign up for email updates and get emails when they ammo in stock. They load their ammo with some good bullet and I have had good results with this ammo on the range.