![]() 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. 338 caliber bullets are available in weights between 200gr-250gr. They are the leading manufacturer of 458 SOCOM, 375 SOCOM, 240 Spectre and 338 Spectre ammunition. The 10mm rim is 0.424' (10.8mm) in diameter, and the SPC rim diameter is 0.422' (10.7mm). Made in USA Length: 16.5 Inches Email To Friend Specifications Q&A Reviews Product Overview SBR is a manufacturer of small arms ammunition specializing in precision training, match, hunting & duty cartridges. A shoulder is formed, and the case is lightly trimmed to length, and the neck is sized to. You can do it in one but the neck thickness isn't as consistent. .338 Spectre - Uses 10mm Magnum pistol cases with a 6.8 SPC bolt-face. The lapua stuff is much better and we normally use two buttons to bring the neck diameter up from 6mm. I've had the sides split the first shot and consistency case to case is crap. I started out using Remington 7BR brass which is available every once in a while but it is crap brass. 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. 0065' but is still stiffer and less fragile than other. manufacturer of the 375 SOCOM, 338 Spectre, and 240 Spectre ammunition. The advent of Cowboy Action Shooting has helped to revive this obsolete vintage cartridge. Load data for our Superior Plated Bullets can be found in any manual or on any. 8 in twist is standard though some prefer a bit faster if they run copper solids or the lehigh brass solids. 44 Winchester, this caliber gained popularity because of its availability in both rifles and handguns. We are shooting everything from 300gr Sierra matchkings at 1050fps to 180 Barnes or Hornady at 2300fps or more depending on barrel length. The reamer is available from PTG I think.have to look at mine. There is another 338 whisper based on the necked up 223 case that is a waste of time. We use 6mmBR cases made by Lapua necked up to 338. Its based on the 30 Benchrest which is a shortened 308 case. I've done quite a few barrels for the Desert tacticals in 338BR which some call the 338 whisper.
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