300 whisper super-sonic load range results

[320pf]

"Hey, if Tubbs is using one it's kinda hard to argue with that, that guy is so talented I have a feeling if he was using a drinking straw and a hand full of peas he would be tough to beat...."

Great line! I am still having a good laugh.

Yes I would love to see a pic of the 220 SMK

320pf

[kurtz]

320pf,

Here is the link to the pic of the recovered 220 SMK, sounded like a line trimmer cutting through the grass....

http://www.quarterbore.net/forums/ph...20-SMK-web.jpg

[320pf]

Kurtz,

I does not look any worse for the wear.


320pf

[RWBlue]

Originally Posted by kurtz

320pf,

Here is the link to the pic of the recovered 220 SMK, sounded like a line trimmer cutting through the grass....

http://www.quarterbore.net/forums/ph...20-SMK-web.jpg

I have a small pile of those from shooting gel with 240gr SMK and 220gr SMK.

[kurtz]

RWBlue,

cool....do they deform any in the gel?....or do they yaw and tumble?.....with my 1:8 they seem to stay pretty straight going through the plywood at 100 yards all the way out to 200 yds......with the 1:11 they go through the plywood straight with a very slight keyhole but then yaw and tumble out to 200......

[kurtz]

320pf,

I tried your experiment of starting with a longer case up to the shoulder and working the die in until the bolt would go into battery....from where I had been full length sizing to where I ended up after the experiment nearest I could tell was somewhere around...GULP....011"....I'm suprised it would fire with that much headspace.....might be why Remmington 7 1/2 primers wouldn't fire in my full length sized brass at the old setting....

Thanks for alll of your help and suggestions....

kurtz

[pug]

kurtz I hope your reamer order runs along a little faster than mine. Three weeks has turned into eight weeks but Dave Kiff says he is working on it so I am sure I will get it eventually. You said you were working on an AR platform and the case was 39mm. I had a little difficulty with that length as far as feeding and had to drop back to a 1.5" case as that was the maximum length that all of the magazines would handle. Really sorry to see magpul make their pmags so 5.56 specific. They don't feed oddball stuff worth a hoot. Good luck with your project.

[kurtz]

pug,

I was hoping that you project was moving along better than mine and we could see some of the results, I'm still gathering components.....the 39mm brass I formed works out to 1.535" with an overall length with a 125 TNT is 2.235"....I am using DPMS mags that I got from SSK that have about two inches of the large rib milled out to keep the rounds from crossing at the top of the mag....they seem to load into the mag fine and feed out manualy with the M4 feed ramps, but can't chamber all the way (chamber not deep enough)....

How much case taper did you end up with?....mine is pretty straight, may work better in a bolt gun than a semi....

I built my suppressed 300 AR thinking it would be my go to gun every trip to the range but after I made one trip with the bolt gun it seems to win out every time....

If I remember right you said you calculated the power/ballistics of the new round.....what did you come up with?.....the best I can figure with a 125 is somewhere around 2400fps in the AR and 2600 in a similar length bolt gun....just a rough guess, but hey, I'm still learning/working out headspace issues with my 24" bolt gun....

hope things go well..

kurtz

[RWBlue]

Originally Posted by kurtz

RWBlue,

cool....do they deform any in the gel?....or do they yaw and tumble?.....with my 1:8 they seem to stay pretty straight going through the plywood at 100 yards all the way out to 200 yds......with the 1:11 they go through the plywood straight with a very slight keyhole but then yaw and tumble out to 200......

They tumble.
They get very good penetration.
Where it gets me is it doesn't leave a hole in the gel. I mean that the gel almost seals up behind the bullet. It is almost arrow like, just a cut straight through.

[320pf]

Kurtz,

I bet if you try the Remmington 7 1/2 primers they will work in the custom sized brass. If you want to try it without a trip to the range you can press a Rem 7 1/2 primer in an uncharged (sans powder and bullet... no offense intended here just an obligatory word of caution. Just in case there are any lawyers around ) case and try it in the rifle.

On a Different note. I did some additional research on Hodgden Lil'Gun powder. It seems that most people are getting similar results that I am getting with this powder. Some of the highest velocities without sign of high pressure (no excessive flatting, cratering of primers or blown primers). The powder does not produce as good of groups as I get with W296... but I can live with 1-inch groups at 100 yrd.

Has anybody else tried LilGun?

Also do you think that we should start a new thread discussing the various powders that work with the 300?



320pf