It’s not hard to derive where the perceived need for this cartridge came from. Its close enough for illustrative purposes. History The M-16…well close, the original issues ones did not have a 30 round magazine. It is supported by Southern Ballistic Research (SBR) in Georgia but was originally conceived by Teppo Jusu. Likely means this ammunition is not available in European markets. The 338 Spectre is a wildcat cartridge, with no SAAMI published specs, and at the time of this writing, nothing has been published on C.I.P’s website. Based on a 10mm Magnum Case (Not 10mm Auto) necked down to accept 338 caliber bullets, this is a potent and versatile cartridge for any AR or Bolt gun. Imagine having a subsonic round with the same muzzle energy as a 44 Magnum but out of an AR platform and utilizing suppressors designed for 9mm. Load data seems to be pretty spot on but need to get to an outdoor range here soon to stretch out a bit & chrono, but living in Iowa is not conducive to this lol, especially this time of year.338 Spectre, an interesting cartridge supported by Southern Ballistic Research (SBR) and one of my favorites to play around with. Overall, I was pretty impressed with accuracy with the limited distance I had available. I have an AGB on the build but eliminated that being the issue pretty quickly. Talked to u/bsev81 and he gave me some suggestions on the extractor. Was only able to single fire due to failure to extract. I used a modded ejector from Ron Williams but that didn’t do the trick. As far as the rifle, the ejector needs work. Load data: Bullets 250gr and below sit at 2.10" COAL, bullets heavier than 250gr, seated at 2.20" No signs of overpressure, fired brass here Yes, my castle nut is fucked, what's new.įinally got to the range, unfortunately I had to go indoors and was not able to use my chrono (ol’ faithful, caldwell green machine) due to limited space. It's been asked a couple times: Twist rate is 1:6.5īuild - I just put together the upper and swapped it onto another build (10.5" 556/223).
338 spectre vs 338 lapua update#
Will update in a few days once I can get to the range. ** I'll post a pic of the rifle and other findings later today!Įdit: Welllll today isn't going to work, had some things come up. Shoutout to Nito at AP2020 Outdoors for the inspiration. Total Velocity is looking to be just around 940-950, so under 1k. Powder used is Lil' Gun.Ĭompleted rounds from left to right: Hornady GMX 225gr (2.10") Barnes TTSX 225gr (2.10") Lapua 250gr (2.10ish) and Lapua 300gr (2.20"). Pictures:You will see a normal 10mm Auto case, the case ran through the Seater Die, then ran through the sizer die for sizing. Everything else is your standard AR parts. I'll be shooting out of an 8" barrel specifically made for this cartridge, 6.8 SPC BCG, modified extractor, and a 6.8 SPC magazine. Heading out to the range later today for some testing. It's a sized down 10mm Auto case with a 338 projectile. I've been taking a break from 8.6 BLK and focusing on 338 Razorback, a Ron Williams / Jim Caudill collaboration.
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