.300 Whisper progress

[nwcid]

So after getting .30 cal silencer last year I found out about the .300 Whisper and decided I needed one. Well as I was picking out parts I decided I needed to do something a bit different with this one. The big thing about the Whisper is that it uses all standard AR-15 beside the barrel. This means it uses the same mags and the ammo is obviously not the same. I knew I wanted to feed it from 20rd mag and decided to go with OD MagPul P-Mags. To make things look right that meant OD stock, grip, rail covers, ect.

The 20rd P-Mags were just hitting the market and the UBR stock was just released in black with other colors to follow soon. I called up MagPul and asked when the though they would have the OD goodies out and was told Sep/Nov so just a couple months. Then Nov 4, 2008 happened and unless it was Black or FDE forget about getting it and even then it was hard.

Well at this point I had and OD grip, OD rail covers. So I decided I could wait a bit. A couple of months ago I swore I finally saw OD mags in stock and went to order some a few days later and they were gone so I assumed I had misread. Well about 6 weeks ago the mags were in stock and I order a dozen. That just left one big part, the UBR stock.

While in my favorite gun shop yesterday he had one UBR on the shelf and it was OD. Said it was the first UBR he had seen and had just put it out. I snatched it right up and took it home with me.

http://img.photobucket.com/albums/v510/nwcid/DSC_0004-2.jpg

Now the next thing I really need to spend money on is a scope for this. I need to get out good targets set up to 300 yard and record actual drop with the loads I am using. I plan on having a custom built reticle for this gun.

I am also going to Duracoat the barrel a matte black and do the flutes in MagPul OD green.

BTW the .30 cal silencer is very heavy at 26oz so I have a 9mm can on there now that weighs 9oz which is much better.


Here was my first post about this gun, http://www.quarterbore.net/forums/showthread.php?t=2223

[ds762]

Looks like a good set-up. My question is have you fired the upper? I tried PMags in my whisper .. and they wont feed due to the built in "lip" at the very front of the mag. Not trying to rain your parade .. but I think you are going to need some GI mags.

[nwcid]

I have a couple hundred rounds though it. It is awsome

I got Pmags because they DO work. I have tons of GI 20's and they would NOT work for me. The edge of the brass would hit the edge of the mag and not feed at all. I tried several with the same results.

I am shooting the 220gr Hornady RN bullets in mine.

[Alleycat]

The Dremel is your friend:grin:

[nwcid]

Not that I am not a fan of the Dremel why Dremel something that works just fine?

[Colohunter]

That is a nice looking set up. I use the 30 rnd Pmags in mine without an issue.

[redtazdog]

Its about time you got your 300 whisper done :wink:
I shoot the 220 grn rnose bullets too because its cheaper and they feed
fine with the magpul mags without mods.
.
Here is somes balistics for the 300 whisper using 220 and 240 grn bullets, as you can see the bullet drop for the match bullets isnt much diference than the Round nose and 270 grn cast lead is close to the same.
Loaded at 1050 FPS

.
308 dia. 220 gr. RNose
Ballistic Coefficients
.310 @ 2600 fps and above
.335 between 2600 and 2200 fps
.378 between 2200 and 1600 fps
.410 @ 1600 fps and below

538fpe at the muzzle

Bullet drop
zero at 100
-12.0 at 150
-33.7 at 200
-64.8 at 250
-106.0 at 300
------------------------------------------

308 dia. 220 gr. HPBT MatchKing
Ballistic Coefficients
.331 .629 @ 2100 fps and above
.624 between 2100 and 1700 fps
.608 @ 1700 fps and below

538fpe at the muzzle

Bullet drop
zero at 100
-11.9 at 150
-32.5 at 200
-62.3 at 250
-101.4 at 300
------------------------------------------


308 dia. 240 gr. HPBT MatchKing
Ballistic Coefficients
.361 .711 @ 2150 fps and above
.702 between 2150 and 1800 fps
.685 @ 1800 fps and below

587fpe at the muzzle

Bullet drop
zero at 100
-11.8 at 150
-32.2 at 200
-61.7 at 250
-100.3 at 300
-------------------------------------------


308 dia. 270 gr.Sp cast lead
Ballistic Coefficients average for this bullet
.331 .629 @ 2100 fps and above
.624 between 2100 and 1700 fps
.608 @ 1700 fps and below

662fpe at the muzzle

Bullet drop
zero at 100
-11.8 at 150
-32.4 at 200
-62.1 at 250
-101.2 at 300

[nwcid]

Thanks for the chart. I have been getting more of my time back for me over the last couple of months. With that I now have more time for working on my projects.

How do you feel about shooting the 270gr cast bullets though a suppressor? I have read over and over that you should not do it. I did just get a start on casting stuff, got everything but moulds.

[redtazdog]

Thanks for the chart. I have been getting more of my time back for me over the last couple of months. With that I now have more time for working on my projects.

How do you feel about shooting the 270gr cast bullets though a suppressor? I have read over and over that you should not do it. I did just get a start on casting stuff, got everything but moulds.
.
I dont shoot cast through any centerfire can but I have the data
just to compare balistics.
I may just have to make another drive over to the eastside to
get some more long range shooting in before the winter storm hits.
Soon I will be starting a form1 40 cal can that will work on the
cheytac and the 375H&H and I will need your shooting spot to reach out.
:grin:

[ds762]

I had always been told that P-Mags wouldn't work. I'll give it a try.

to the poster who said something about dremeling them .. could you show a pic of a modified P-Mag so I can see what your talking about?

[Alleycat]

I modify GI mags. All I do is round all the edges on my 223/300 Whisper stuff. On 458 mags I do quite a bit more. I've never used P-mags. Nothing against them. It's just personal preference.