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Forum: 300 Whisper Rifles and Pistols

01-31-2007, 12:11 PM

Replies: 10

1st 300/221 build

Views: 2,729

Posted By jjmcrowell

Mine worked out to 9.1 gr of H110 with 220 gr...

Mine worked out to 9.1 gr of H110 with 220 gr HPBT and I get 1040 fps.

I uploaded a video to youtube.

http://www.youtube.com/watch?v=5QGwXtFdLHg

Forum: 300 Whisper Rifles and Pistols

01-08-2007, 10:35 PM

Replies: 10

1st 300/221 build

Views: 2,729

Posted By jjmcrowell

Seems like everybody is around 9 or 10 grains...

Seems like everybody is around 9 or 10 grains with H110 for sub-sonic. What length barrel are you using?

Forum: 300 Whisper Rifles and Pistols

01-07-2007, 10:33 PM

Replies: 10

1st 300/221 build

Views: 2,729

Posted By jjmcrowell

I have only tried it with one load, 10.0gr of...

I have only tried it with one load, 10.0gr of H110 with a 220 HPBT. It cycles OK, however it is super-sonic. I'm going to try and work out a load that is about 1050fps or so. I have to borrow a...

Forum: 300 Whisper Rifles and Pistols

01-07-2007, 08:02 PM

Replies: 10

1st 300/221 build

Views: 2,729

Posted By jjmcrowell

It's on an full auto M16 lower receiver...It is...

It's on an full auto M16 lower receiver...It is perfectly legal as it is now.

I was thinking about putting it on a semi auto SBR lower, since the M16 normally has a 5.56 upper with an 11" barrel...

Forum: 300 Whisper Rifles and Pistols

01-07-2007, 10:30 AM

Replies: 10

1st 300/221 build

Views: 2,729

Posted By jjmcrowell

1st 300/221 build

I have been working on this for quite awhile, It is finally done, all that needs to be done is workout some loads for subsonic.

I have wanted to build a M16 with the look of an MP5SD and when I...

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