300 Whisper Owners... Please sound off!

[Shooter62]

Hello,
I just built my first .300 whisper. It's my fourth AR build. It has a 16" bbl from model 1 sales. The only load I've tried so far is with win 296 and 180GRN bullets. It really didn't work well. It wouldn't lock the bolt back, and I had one blown primer. I'm thinking the powder may be too fast with my gas port being in the carbine position, but I don't know.
Other factors may be the one piece gas ring I use in my guns. They some times take a little time to wear in and funtion properly. Also I hate the Spring noise on AR's so I added grease to the buffer assy.
Anyway, I'm glad I found this site and will be doing a lot of reading to try and figure this out.
I'd really like to find a load using powder I have on hand, especially W296 or maybe IMR 4831.
To make a short post long
HELLO

[camelback]

I have a ? can you shoot 300 whisper using a 9mm can.I'm shooting 210smk 10.4 aa1680 @ 975/1020 fps.I'm using 30cal. can now on my bolt gun that i set up in 300 whisper.

[AxisNtheMornin]

I live on a high fence ranch with a 13 acre lake that is surrounded by random home owners, many in a retirement community. It's fairly rural, Deer EVERY WERE, turkeys, fox, ducks, swans, miss. varmint and pigs. I have had the law called (they were very understanding and polite,) because of people being startled by "HIGH POWERED RIFLES BEING SHOT REALLY CLOSE TO THERE HOMES!!" this is not all true. The pigs love all the limestone valleys around the property and they cause the report sound waves to be directed strait up towards 2 homes. My ar15 is quite loud and...I like to shot it...So I got a 300 whisper barrel. I'm in love with the ideal of it and have yet to explore it!!!!

I'm planning on mounting my Trijicon 6x48MGO on an older style MGI with an Eotech 552 on the Trij. The Trij will be sighted in for my 223 1-9twist barrel and the Eotech sighted for my 221 1-8twist Fireball barrel. With any luck I will be able to get some brass made/purchased soon and work up some sub loads. Still don't have a Can for the 300 221 barrel, working on it. Would like to get an adapter made for it that allows me to use the same Can for 308. Don't know if i can wait for it to be manufactured!!!

[mstarling]

I live in the country on 80 acres ... but neighbors are much closer than they used to be. I have to be much more cautious about shooting that I once was. The big rifles (9,3x62 to .458 AR) are LOUD and tend to rattle windows a long way away.

Have been a handloader and bullet caster for more than 40 years.

Making arrangements to have a 1 in 8 twist 16+" barrel built with an adjustable gas block in the pistol position, a flat top upper, and a free floating handguard. Will be a pretty heavy bbl (1" behind the gas block and .750" in front of the gas block). Hope to be able to afford an SAS Titanium suppressor next year maybe.

Have dies and am playing with making brass from 5.56 LC brass.

Looking forward to playing with a "little gun" and then a quiet gun for a change.

Really appreciate the information available on this forum. Thanks Guys!

[ds762]

I just recently got my 300 built! I am using a custom made 8.5" Bartlein bbl that my brother chambered. pistol gas system with an adjustable gas block from tp555. LaRue 7.0 handguard and an SAS 30 cal suppressor.

making the LaRue handguard jive with tp555's gasblock was NOT fun. I had to grind the sharp corners off of the gasblock and totally dissassemble the block. I then had to do surgery on the handguard and remove some material. Assemble upper and slide the gasblock into place and reassemble it in place.

All in all it was worth it (I got what I wanted) .. but I aint rushing to do that again!

[Dino92g]

Greetings all!

I guess I've been lurking here long enough and it is time to now make a post!

I've been shooting the 300 Whisper (subsonic) from a 10-3/4" T/C for several years now in IHMSA. It won me a couple State and International Big Bore trophies. It's one hell of a good Big Bore round!

I've been handloading for almost 10 years now for conventional & several wildcat calibers for IHMSA and benchrest work on a Lyman turret press and as an IDPA shooter produce prolific amounts of 9, 40 & 45 rounds on a progressive press.

Over the last couple of years I've gotten BRD (Black Rifle Disease) and have built a couple and bought an RRA Varmint A4 as a bench gun and it has done an amazing job at making small groups.

I am FINALLY able to get one of JD Jones's 300 Whisper uppers. I met with JD two weeks ago and now have a custom 300 W upper on order!

I'm building a RRA lower with the national match trigger group for it. I haven't quite decided what type of glass I'm going to put on it, but do want a tactical optic in the 3 to 10 or 12x range. Likely will go with a 30mm tube and mil-dot reticule to take advantage of the higher level of elevation adjustment the Whisper needs when using both subsonic and supersonic rounds.

I very much look forward to contributing my experience to our group here with the Whisper upper and can't wait to see what kind of loads I come up with and how small a group it will print for me both in sub and supersonic modes!

Advice on any facet of my new adventure is greatly welcome & appreciated.

Thank you!

Best regards,
Dino

[BWE Firearms]

I have been a gunsmith for over 25 years and have been watching this forum for a while now. I have been playing with subsonic rifle rounds for about a two years whenever I have a couple of minutes here and there. I have just started to introduce a new line of custom rifles called the Thumper line. They are all based on the K.I.S.S. principle. The first one we are producing is the 50 Thumper built on a Remington 700. We will be coming out with the .338 Thumper shortly which will be based on an AR platform. The 50 Thumper is desititing on Hogs. You can see the 50 Thumper on our website and we will have the 338 Thumper up shortly.

[Rancid Coolaid]

Just got my first Whisper yesterday, built by Kelly Kyle in Oklahoma.
Topped with new SuperSniper 10X HD (for now) and suppressed with YHM 7.62 Phantom.

Reloading tomorrow (220-gr SMK over various charges of #7, shooting subsonic.)

Range report to follow.

I'll be looking around on the forum for favorite recipes.

[snaz567]

I just picked up a 10.5" bbl from tp555 a couple of weeks ago. This is a SBR AR build for my wife. I'd been using a 6.8spc loaded w/150gr SP's & AA#9 for subs, but cycling was so-so and I was key holing pretty badly at 100yrds. I decided I'd pick up a whisper and give it a shot for her instead. I'm just waiting on a stamp so I can starting building her can. Until then, I'll just use my HVT and see what I can come up with.

[miker557]

I currently have a Model 1 Sales upper for my AR (and am still trying to work up a suitable subsonic load for it). I also have a Remington 700 that I will be building up as soon as my McGowan barrel gets here. I'm going to assume there's no real need to make the barrel longer than 20 inches? I also have a Howa 1500 that I may convert later on (if I can get metric change gears for my lathe). I have also finally obtained a TC Contender, and will be shopping for barrels for it.

Miker