Wolfdog91
03-16-2022, 10:39 PM
So have been kicking around the idea of building a cast specific ar upper ( yeah I know not like I have enough pokers in the fire lol !) in something......off the wall .... A little on the weird side,but not too crazy. And in an AR configuration so I don't need ,well you know a lathe and all sorts of other gunsmithing tools. Well after I finally build a good 5.56 upper lol, anyway Mad Dog Weapons Systems has this deal called the .358 Yeti and along with the cool name ( gotta have the cool name am I right ? [emoji23]) ,The parent cases are pretty easy to find it ,theirs a TON of various .358 dia molds it seems. Heck noe show 600+ options for .358 molds. Heres a quote and some screenshots from their website.
Some of you may know about this one, but for those that don't here's some info!
358 Yeti
The .358 Yeti is a mid-bore wildcat being developed for the AR-15 platform with the balance of speed and power in mind. It is based off plentiful 7.62x51 NATO brass shortened to 1.646" and resized to accommodate a .358 diameter projectile. The choice to use NATO brass for the parent case is because it has the thickest case wall, meaning that any other brass with the .473" head will be useable (i.e. .308, .243, 7mm-08, 6.5CM, etc). This gives the end user many sources for very affordable (and sometimes free) brass. The chamber has been designed with brass making in mind meaning there is no neck turning or reaming necessary. Simply chop the brass at the neck/ shoulder junction, run through a sizing die, final trim, and chamfer/ debur –much like the 277 Wolverine. Formed cases will hold 45-47g of h2o with a slight increase of capacity being gained once fired, but this round not one to be classified as “requiring fire-forming.”
The performance goals for this cartridge are to get a 180g projectile up to 2600fps from a 16"-18" barrel and a 200g to 2500fps. At those anticipated velocities, the 358 Yeti will generate more energy than the following calibers: 6.8 SPC, 300 Blackout, 450 Bushmaster, 458 SOCOM, 50 Beowulf, 35 Remington, and 6.5 Grendel (*up to 375 yards).
Useable projectiles are in the 180g-225g range with the option of lighter projectiles such as those for 38/357 and 9mm as well for inexpensive rounds for plinking. The 358 Yeti is designed to have optimal performance with projectiles in the 180-200g range such as the Speer Hotcor, Hornady interlock, and Hornady FTX. Some Barnes and Nosler offerings are also possible with the removal of the polymer ballistic tips. Additionally, 250g+ projectiles will be tested for subsonic performance.
A newly designed, strengthened bolt by Maxim Firearms will be utilized with a matching oversized extension. The bolt being used was initially designed for the 30 RAR at SAAMI pressures of 55,000 psi. This bolt will be machined with the smaller .473 bolt face as opposed to the .492 bolt face of the 30RAR, resulting in more material on the bolt, yielding slightly more strength. Loads will be pressure tested via pressure trace to ensure we are staying at or below 60k psi.
Latest progress:
Earlier this week I received the die that I had modified for forming 358 Yeti brass from my gunsmith. Now that I am able to form brass to the proper dimensions, I am able to get the last few measurements needed to complete the reamer print. Once those measurements are determined, I will send out for the reamer and gauges. When the reamers are delivered, I will then have the first 358 Yeti barrel chambered for my Savage. That's when the real fun begins!
Welcome to the beginning, fellas! Feel free to share ideas, ask questions, or just tag along for the ride. This is going to be fun!
https://uploads.tapatalk-cdn.com/20220317/67eab432a51b1c976c8de714f73fe735.jpghttps://uploads.tapatalk-cdn.com/20220317/9223f513d2741681a64b63cc220bc8ff.jpghttps://uploads.tapatalk-cdn.com/20220317/b16c58b9478ce49d4090760ae7e149aa.jpghttps://uploads.tapatalk-cdn.com/20220317/1c6a92a4556ecde59a376e468ed1a5ce.jpg
Idk seems like something cool to play with. Is there suff that will do what it does already? I mean yeah probably but come on, .358 Yeti , if that doesn't scream crazy gun but / reloader I don't know what does lol [emoji23] ! Anyhow anyone mess with something like this ?
Sent from my motorola one 5G UW using Tapatalk
Some of you may know about this one, but for those that don't here's some info!
358 Yeti
The .358 Yeti is a mid-bore wildcat being developed for the AR-15 platform with the balance of speed and power in mind. It is based off plentiful 7.62x51 NATO brass shortened to 1.646" and resized to accommodate a .358 diameter projectile. The choice to use NATO brass for the parent case is because it has the thickest case wall, meaning that any other brass with the .473" head will be useable (i.e. .308, .243, 7mm-08, 6.5CM, etc). This gives the end user many sources for very affordable (and sometimes free) brass. The chamber has been designed with brass making in mind meaning there is no neck turning or reaming necessary. Simply chop the brass at the neck/ shoulder junction, run through a sizing die, final trim, and chamfer/ debur –much like the 277 Wolverine. Formed cases will hold 45-47g of h2o with a slight increase of capacity being gained once fired, but this round not one to be classified as “requiring fire-forming.”
The performance goals for this cartridge are to get a 180g projectile up to 2600fps from a 16"-18" barrel and a 200g to 2500fps. At those anticipated velocities, the 358 Yeti will generate more energy than the following calibers: 6.8 SPC, 300 Blackout, 450 Bushmaster, 458 SOCOM, 50 Beowulf, 35 Remington, and 6.5 Grendel (*up to 375 yards).
Useable projectiles are in the 180g-225g range with the option of lighter projectiles such as those for 38/357 and 9mm as well for inexpensive rounds for plinking. The 358 Yeti is designed to have optimal performance with projectiles in the 180-200g range such as the Speer Hotcor, Hornady interlock, and Hornady FTX. Some Barnes and Nosler offerings are also possible with the removal of the polymer ballistic tips. Additionally, 250g+ projectiles will be tested for subsonic performance.
A newly designed, strengthened bolt by Maxim Firearms will be utilized with a matching oversized extension. The bolt being used was initially designed for the 30 RAR at SAAMI pressures of 55,000 psi. This bolt will be machined with the smaller .473 bolt face as opposed to the .492 bolt face of the 30RAR, resulting in more material on the bolt, yielding slightly more strength. Loads will be pressure tested via pressure trace to ensure we are staying at or below 60k psi.
Latest progress:
Earlier this week I received the die that I had modified for forming 358 Yeti brass from my gunsmith. Now that I am able to form brass to the proper dimensions, I am able to get the last few measurements needed to complete the reamer print. Once those measurements are determined, I will send out for the reamer and gauges. When the reamers are delivered, I will then have the first 358 Yeti barrel chambered for my Savage. That's when the real fun begins!
Welcome to the beginning, fellas! Feel free to share ideas, ask questions, or just tag along for the ride. This is going to be fun!
https://uploads.tapatalk-cdn.com/20220317/67eab432a51b1c976c8de714f73fe735.jpghttps://uploads.tapatalk-cdn.com/20220317/9223f513d2741681a64b63cc220bc8ff.jpghttps://uploads.tapatalk-cdn.com/20220317/b16c58b9478ce49d4090760ae7e149aa.jpghttps://uploads.tapatalk-cdn.com/20220317/1c6a92a4556ecde59a376e468ed1a5ce.jpg
Idk seems like something cool to play with. Is there suff that will do what it does already? I mean yeah probably but come on, .358 Yeti , if that doesn't scream crazy gun but / reloader I don't know what does lol [emoji23] ! Anyhow anyone mess with something like this ?
Sent from my motorola one 5G UW using Tapatalk