![]() I’m also not seeing a significant increase in performance from the. 300BLK because it’s well established, uses common off the shelf parts, and has a ton of factory support. If I’m looking to shoots subs and supers out of the same small pattern AR, I’m going to choose. Plus hard to find parts is going to kill off most interest. While you may only want to shoot subs, most people are going to like the ability to swap back and forth between subs and supers just like. Being built for a small frame AR means it’s really only comparable when looking at subs. 338 Spectre on the other hand appears to be a wildcat based off of a wildcat that has never enjoyed much support from anyone outside of a relatively small group of companies/people. Factory support from big names in the firearms industry essentially seals the deal. It offers a wide range of capabilities that can fill a lot of roles for a lot of different people. 300BLK in most ways and it’s easy to see why the popularity is there. 8.6BLK is essentially a bigger brother to. Seeing all the above, I’m really not sure why anyone would choose. 338 Spectre with its comparatively tiny case capacity. Developed for AR-10 pattern guns using 6.5C brass, so supersonic loads will offer vastly increased performance over the. Numerous big name manufacturers supporting with parts and ammo. Unsure on SAAMI cert but it is being pursued. Only needs a barrel swap, everything else is standard large frame AR pattern. Not even developed for the same platform Basically Non-existent factory/aftermarket support (there appears to be a small handful of small time manufacturers/retailers selling components/ammo for it with most being out of stock at the current moment) No JD jonesing involved.Why would it? Just based off a cursory search as I don’t have a ton of knowledge on the Spectre: 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'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. 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. 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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