MaDuce Posted November 19, 2011 Report Share Posted November 19, 2011 Here's a little something that's been on my mind lately. I'll probably never put the idea to actual use, but an interesting thought experiment if nothing else. We've seen all kinds of stuff in the AR-15, and even invented some rounds for the gun like .50 Beowulf, 6.8 SPC etc. and that's in addition to all the other stuff that'll fit it with just a barrel change and a few minor adjustments. So my thought is, why not do it for the LR-308? I know there are a few already out there such as .243 Magnum and all, but I'm wondering, where could we actually take it? Also, I'm wondering if we can't bottleneck something very big like a .50BMG or .460 Weatherby down to a .338 to get the ballistics of a .338 Lapua out of the gun. Anyway, I'd like to hear your thoughts on this. Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted November 20, 2011 Report Share Posted November 20, 2011 Well, it would have to be a cartridge that is considered a "short-action" round for bolt-action rifles, e.g., .243 Win, .308 Win, etc.Maybe .338 WSM? Open that up to a .375, .400, .450, .475, and/or .500.Just on a .308 case, how far have they opened that up? The biggest I'm aware of is the .358 Win, though the .338 Federal is supposed to develop quite a bit more muzzle energy.I'd like to see something along the same lines as the .300 Whisper based upon the .308 case (the .338 WSM could probably make something REALLY effective!), wherein the case is opened up to basically the width of the body and pushing a bullet of that diameter. In the case of a .308 case, pushing a .454/8 diameter slug of 450 grains at just under the speed of sound...we could get cute and call it a Whisper, but the .450 THUMP sounds better.By law we would be regulated to a .500 diameter bullet in a WSM based case...so a limitation of what...600 grains? It would probably be worth paying a licensing fee to call it something like the ".500 Sante Fe Locomotive". Sorry Senor Terrorist...your Russian issue bullet proof vest doesn't count anymore.Jon Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 20, 2011 Report Share Posted November 20, 2011 I think I already posted something like this before - a list of short action rounds that have been applied to semi-auto rifles. It's somewhere here... <dontknow>Found it...Here's a list of what you'll be able to shoot through the big-bore AR. This may or may not be all-inclusive - I have no idea how many new calibers, and wildcats, come out everyday....243 Win.260 Rem7mm-08.270 WSM284Win, 35Rem.257Roberts7mmWSM.300WSM.325WSM.338WSM.300 Savage.300 Remington Short Magnum.338 Federal.358 Win.450 Marlin.470 Rhino.500 Phantom Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted November 20, 2011 Report Share Posted November 20, 2011 A lot of those are chambered in the Browning BAR (sporting gun, not the cool M1918).There was a Mini14 on GB earlier this year or last year that was a conversion to .257 Roberts. Reserve was WAY high.Jon Quote Link to comment Share on other sites More sharing options...
Jgun Posted November 20, 2011 Report Share Posted November 20, 2011 I've been told that the .338 Ruger compact magnum (.338 RCM) is ballistically superior to the .338 Federal, and will also chamber in the large platform AR. Anyone know anything about this cartridge? Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted November 20, 2011 Report Share Posted November 20, 2011 Oh baby, could you imagine a SBR .450 Marlin?I'm still waiting for a reliable shotgun upper! Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted November 20, 2011 Report Share Posted November 20, 2011 I've been told that the .338 Ruger compact magnum (.338 RCM) is ballistically superior to the .338 Federal, and will also chamber in the large platform AR. Anyone know anything about this cartridge?I've only read the articles. Ruger puts this round in their Compact Magnum M77 rifle. The case is based on a shortened .375 Ruger Magnum. You would probably be able to keep a fairly high magazine capacity too.Jon Quote Link to comment Share on other sites More sharing options...
MaDuce Posted November 20, 2011 Author Report Share Posted November 20, 2011 An LR-308 pattern shotgun? That would be COOL! Right now though, I'm eyeballing a used old shotgun selling locally for $100 that would make a great bullpup custom project. Hay Mr. Robobot.... we need to go shooting some time! Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted November 20, 2011 Report Share Posted November 20, 2011 I've been told that the .338 Ruger compact magnum (.338 RCM) is ballistically superior to the .338 Federal, and will also chamber in the large platform AR. Anyone know anything about this cartridge?The benefit of the 338 Fed over the RCM is the casing. The 338 Fed uses the same bcg and mags as the 308. All that req'd to convert is a new barrel, or have a gunsmith bore out and rechamber your existing barrel for about $150. The RCM would need a new bolt, possibly a different buffer system, barrel, and customized magazines. Quote Link to comment Share on other sites More sharing options...
Jgun Posted November 20, 2011 Report Share Posted November 20, 2011 Do you know what the parent case is for the .338 RCM? I certainly can appreciate the commonality of components as the 300BLK has with .223, but I'm wondering if there's enough ballistic superiority over the .338 federal to recommend it. I'm trying to come up with something to get me interested in a new large platform AR build, and I'm thinking that a different caliber (if I can find the right one) might do it. The two logical directions seem to be, either go for a max range cal like .260 or 6.5 BR or go for the most powerful long range cal I can come up with, which right now seems to be one of the .338 short action cartridges. Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted November 21, 2011 Report Share Posted November 21, 2011 The case is based on a shortened .375 Ruger Magnum. JonAnswered, then asked...I'll marvel you often with my pah-sychic abilities. <lmao>The .375 Ruger itself is too long I believe, being something like 63mm in length.Jon Quote Link to comment Share on other sites More sharing options...
Jgun Posted November 21, 2011 Report Share Posted November 21, 2011 Might be more a case of my poor comprehension or retention skills than your clairvoyance. I think I'll reserve my judgment on whether you can read minds, until I've seen you answer a couple of my unposted questions in your responses first. Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted November 21, 2011 Report Share Posted November 21, 2011 I'm just giving you a hard time Jgun.I'm barely clairvoyant enough to know I'll need to go to the bathroom.Jon Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 22, 2011 Report Share Posted November 22, 2011 I'm still waiting for a reliable shotgun upper!An LR-308 pattern shotgun? That would be COOL! Check it: Quote Link to comment Share on other sites More sharing options...
MaDuce Posted November 24, 2011 Author Report Share Posted November 24, 2011 That's COOL!! Quote Link to comment Share on other sites More sharing options...
Jgun Posted November 26, 2011 Report Share Posted November 26, 2011 Too bad it has a plastic lower. Quote Link to comment Share on other sites More sharing options...
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