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olyinaz

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https://whiskey3precisionsystems.com/375-reaper

Does anyone know anything about the bolts and/or the people behind this cat?

More:

http://www.thefirearmblog.com/blog/2014/09/24/update-375-reaper-whiskey-3-precision-systems/


http://www.ncgunowners.com/forum/showthread.php?tid=46279



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biggdawg

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Reply with quote  #2 
the bolt fits a standard ar15 barrel extension that is what i have read so i don't know how much stronger it could be.

the guy seems a bit arrogant to me.

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Borrego Bob

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Reply with quote  #3 
The bolts are made by Youngs in Arizona. 
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Borrego Bob

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10367149_734995353216868_8715445534148700305_n.jpg 

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Borrego Bob

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 375 Reaper ™, .30 Reaper ™ with a 200 grain W3PS TAC-PM ™ RBT Projectile, .30 Reaper ™ , 7mm Reaper ™ and 6.5 Reaper ™

10689906_734202993296104_6055536999407613195_n.jpg 


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Borrego Bob

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Reply with quote  #6 
They are keeping there COAL down to 2.24 or so because they are planning on using 5.56 mags. They will get decent performance i think. Probably not as good as loading to 2.3in. Not sure what length they are cutting the brass to. 
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olyinaz

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Reply with quote  #7 
It's the bolt and extension that has me intrigued, because they are NOT using a bolt/extension combo like the 800 Series designed by Harrison (hope I'm getting that right) but rather a "super bolt" design that's no doubt stronger, but how much so I don't know.

This leads to a fairies and unicorns head scratching on my part!  More info here down the page a ways:  http://www.ar15.com/mobile/topic.html?b=3&f=121&t=649568&page=5

[9d68bb09-0d7e-4061-ac81-a1c7ed2b44bd_zps5ae4075b]  [375_2_zps88eef6bf] 

So I think what we have here is a cartridge that's designed to work well in the 40,000s for PSI and still be safe, as opposed to the 270 AR and 30 BRX etc. which are, I should think, well above that.  With the same bolt and extension that guys are using for the 270 AR I guess you could load it up a bit.

In any case it's intriguing and I'd like to hear from some of our usual suspects about it.

Best,
Oly

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Borrego Bob

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Reply with quote  #8 
Compared to the 800 Series bolt which to my untrained eye looks stronger.  10568935_10152718922729520_2762781691426730393_n.jpg  30 RAR bolt.jpg  10699760_10152718923024520_2348262556109631221_o.jpg 

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Borrego Bob

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Reply with quote  #9 
I think the cartridges are a welcome addition to the AR-15 Hunting line up and will continue to monitor them to see how they perform. John Culpepper says they have people lined up to convert there brass for them. We shall see they are trying to stick to 5.56 mags which will lower there case capacity restricting COAL. The 270AR will perform better but they will find a market for people that don't want to convert brass. They also are in talks with commercial licensed ammo loaders so that will help them if they'll have preloaded ammo. 
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Constructor

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Reply with quote  #10 
The radius at the lug root looks just like my normal bolts.

You figure strength by multiplying the width X the length X the yield strength of the metal(160,000 psi more or less for C150 or 9310) X 7 for number of lugs.
If the radius at the bottom of those lugs are the same as my Super bolt then this is what they will handle.
These are the design thrust loads.
17,000-Mil spec C158 bolt
20,000-ARP Super bolt
35,000-ARP 800 series bolt

It is a 375BRX more or less. shoulder location is .002" shorter than the BRX. Apx 45 gr empty case capacity. It will lose a ton of space when the bullet is in the case.

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olyinaz

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Reply with quote  #11 
Quote:
Originally Posted by Constructor
The radius at the lug root looks just like my normal bolts.


That's what I thought too.  It's a nice design, but nothing like your 800 series.

Quote:
Originally Posted by Constructor
If the radius at the bottom of those lugs are the same as my Super bolt then this is what they will handle.
These are the design thrust loads.
17,000-Mil spec C158 bolt
20,000-ARP Super bolt
35,000-ARP 800 series bolt


And the materials/process as well I'd think.  I can see a 15% claim, but 30%?  I dunno.  I think YOUR bolt/extension would be the cat's ass for this thing.

At any rate, I don't want to come off like that LRPFFTHPPP guy over at ARFcom - pooh poohing everything like a knowitall - unlike that genius (just ask him) I don't know diddly.  I just find it a very intriguing chambering and I was looking for some intelligent chat regarding it. 

THANKS

Oly

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Constructor

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Reply with quote  #12 
It would be a hammer for sure just like the 458 Socom is.

The thing about metal is you can't make it stronger than the max published strength posted by those that made it. If anyone knows how strong the material it will be the company making it.  Someone could make it a lot weaker by choosing the wrong heat treat though.

To figure the bolt cartridge thrust find the area of the circle .473 dia or .2365R (.18Si)then multiply by the pressure in the case.  At 40,000 psi that cartridge will have apx 7200lbs thrust. Normally bolts should be designed twice as strong as the thrust.
That bolt should handle 55,000psi for a while.

ETA- The walls of the bolt are so thin that we can't figure any strength to the lugs above the face of the bolt.
The lugs are .277 long -.125 for the recess so  .152" is the length used X .100 wide for a normal AR bolt. .130" wide if  a .032 radius is used along the sides.

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Constructor

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Reply with quote  #13 
from a few years ago-9/20/2010
In the interest of more powerful rounds and keeping the cost down and brass supply up I plan to start building a "30 ARP" the 308 Win shortened .400" and use surplus 308 brass.
Since I already make a .473 bolt I might as well take advantage of it.
Quickload says it will push a 110TSX 200-250fps faster than a 6.8 at the same pressure,
the good thing is that surplus 308 brass is used, cut off .400 and run it into a 308 die that has also been shortened .400.
all from 16" barrels
110=2925
130=2650
150=2500
QL says a 6.8SPC 110gr will hit 2650 at the same pressure.


I am sure another 100fps is possible above these conservative figures.
6 or 7mm BR brass could be used for extra capacity.
Simple and cheap, 10 rounds fit in a 15 round 6.8 mag.
Surplus 308 brass runs about $25/100 processed.

5.56, 6.8, 30ARP with a 150 Sierra spbt
[P8290069] 
http://i208.photobucket.com/albums/bb218/constructor2007/P8290069.jpg

http://http:/http://68forums.com/forums/archive/index.php/t-15984.html

final post from that thread-
constructor
11-03-2010, 06:43 PM
Using LC brass 34gr RE7 hit 2705 with a 125gr TNT from a 17.5" barrel
33gr IMR 4198 gave me 2752, Both are max loads
I tried using Lapua 6 BR brass which has more capacity, I added an extra gr to each of the above loads and lost velocity, the small primer must not ignite the powder as well.

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AR15Performance.com

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Reply with quote  #14 
That guy was taking a beating over on arfcom!
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biggdawg

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Reply with quote  #15 
Quote:
Originally Posted by Constructor
That guy was taking a beating over on arfcom!


yes he did, but he wouldn't answer a question and got all defensive if anyone did ask a question.

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