They used the 338BR in silhouette competition back in the 60s before jd was playing with whispers.and this one is really a full size BR case with the neck set to the cal you want. JD jones seems to get upset when folks use his trademarked whisper name and its not worth fooling with him. We have been calling this one the 338BR to avoid confusion with the 223 based cartridge and also because it was the first one to have been used. You can do it in one but the neck thickness isn't as consistent. The lapua stuff is much better and we normally use two buttons to bring the neck diameter up from 6mm. I thought about 338 Spectre, but didn’t like the non standard bolt face. 338 Federal, but didn’t like the large case capacity. 338 didn’t exist or at least from any sort of mainstream source. I've had the sides split the first shot and consistency case to case is crap. At the time, commercially available subsonic. All of this will be with me at the shoot for a cash sale/delivery. 338 Spectre barrel from TempoJujitsu threaded 1/2X28 -On/Off Stainless Steel Push Button Adjustable Gas Block-1/2X28 Three Lug Adapter Tip. I started out using Remington 7BR brass which is available every once in a while but it is crap brass. .338 Spectre Upper-10.5' Stainless Steel. The reamer I'm using doesn't seem to care, neck area is large enough to accept the ridge. I haven't seen any accuracy differences but some chambers don't like the ridge left when you pull the shoulder up into the neck on the 6mmBR cases. I've done a few AR 10 types and they work well but aren't as accurate as the bolt guns. 473" bolt face and typical short actions work fine. All of them have been very accurate, easy to load for and the quietest subsonics I've yet heard suppressed. A friend using my reamer had done a number of Remington 700's and they are great shooters. 8 in twist is standard though some prefer a bit faster if they run copper solids or the lehigh brass solids. We are shooting everything from 300gr Sierra matchkings at 1050fps to 180 Barnes or Hornady at 2300fps or more depending on barrel length. Loads range from 160 gr up to 300 gr subsonics and Ron reports. 338 Spectre ammunition is now available from Reed's Ammunition and Research ( Ron has developed a number of loads using our 12.5/4.5 T&E upper that cycle the shorter barrel/gas system without an issue. The reamer is available from PTG I think.have to look at mine. We are happy (and proud) to announce that factory loaded. Rohg Arms, Black Viper Side Charging Upper Receiver w/6.8 SPC bolt. Gemtech 9mm Multimount with 3-lug adapter. There is another 338 whisper based on the necked up 223 case that is a waste of time. 338 Spectre UPPER: SBR 16 1:6.5 Twist Barrel. We use 6mmBR cases made by Lapua necked up to 338. Its based on the 30 Benchrest which is a shortened 308 case. Net, net you're limited to 240grain or lighter projectiles, which puts you right back to 300 blackout performance with something non-standard. I've done quite a few barrels for the Desert tacticals in 338BR which some call the 338 whisper. Problem is, it doesn't have the case capacity to do that without going to much slower powders that end up being loud.
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