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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 thunder project
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<blockquote data-quote="goodgrouper" data-source="post: 115377" data-attributes="member: 2852"><p>I thought I would add an update to the thunder project. I took the beast out recently and was fortunate enough to be joined by Idaho Preacher and his thermal imaging camera! This camera looks into objects and can tell you exactly what the temp of any material is down to the tenth of a degree just by looking at it. VERY COOL camera. Also takes some mighty cool cash to own one and lots of it!</p><p></p><p>The temp was 75 degrees and rising quickly. I had 12 shots of RL22 and 225 accubonds loaded up. I fired 3 shots at a time as fast as the barrel would let me shoot. Here are the stats:</p><p></p><p>92-95 grains RL22</p><p>After 3 shots</p><p>temp was a cool 72 degrees at the muzzle and 69 at the throat</p><p></p><p>immediately fired next 3</p><p>after six shots</p><p>97 degrees at muzzle</p><p>94 at teh throat</p><p></p><p></p><p>next three shots fired immediately</p><p>after 9 shots</p><p>103 at the muzzle</p><p>99.5 at the throat</p><p></p><p></p><p>next three shots fired immediately</p><p>after 12 shots</p><p>106 at the muzzle</p><p>103 at the throat</p><p></p><p></p><p>After firing 12 shots, highest temp was 106 and was found at the muzzle. After 9 shots, the throat was slightly warmer than the muzzle but in the time it took to re-shoot the camera (about 15 seconds), the temps reversed as the carbon fiber pulled the heat away from the chamber.</p><p></p><p>In three minutes after firing the 12 shots, the titanium muzzle brake was 3 degrees hotter than any part of the carbon fiber barrel!!</p><p></p><p>Then IP shot his 300 win mag 700 LSS with standard SS factory barrel on it. He is shooting 20 grains less powder and his barrel was 149 degrees after 4 shots! And it was probably 15 minutes before it was down to 85 degrees again.</p><p></p><p> <font color="red"> <em>This carbon fiber absolutely pulls heat out and away from the steel of the barrel at unparalleled speed!! Absolutely amazing!</em> </font> </p><p></p><p>Pictures of the thermal images are being processed and will be posted here shortly. My face in one of the pictures looks twice as hot as my barrel!</p><p></p><p></p><p></p><p>On another interesting note about the thunder:</p><p></p><p>I have been fighting off the temptation to try some 300 grain MK in this gun but I gave in and tried them.</p><p></p><p>I started at 92 grains of H1000 and went up to 94 grains of H1000. </p><p></p><p>92 = 2826</p><p>93 = 2854</p><p>94 = 2872!</p><p></p><p>This was AWESOME speed considering my barrel is only 26" long. 94 grains gave a fairly good ejector mark but 92 and 93 were completely fine. Recoil was noticeably worse than with the 225's or the 250's, but would be tolerable if shooting at an elk.</p><p></p><p>I don't know if I have a fast barrel or not, but the thunder shoots 225's, and 300's faster than the venerable 338 edge and does so with less powder. /ubbthreads/images/graemlins/shocked.gif If I had a 10" longer barrel on it, it would probably go just as fast as the 338 lapua improved and maybe even go a hair faster!</p><p></p><p>I was really expecting to look over at the chrono and see something around the 2700 fps range and instead it was already above 2800 and no pressure signs. And my lot of H1000 is a tad slower than some previous lots I've tried.</p><p></p><p>I might try some RL25 in it next and see if I can crack 2900. Then again, maybe not. I'm not totally sold on the 338 Mk for hunting and my barrel life is not unlimited. /ubbthreads/images/graemlins/wink.gif</p><p>Ah, who am I kidding, I know I'm gonna try it sooner or later!</p><p></p><p>Oh, BTW, I shot the 225 ab's into a nice 4 shot 4" group on the gong at 1145 yards early in the morning before the mirage set in. With groups like that, it's hard to look to another load development session. /ubbthreads/images/graemlins/grin.gif</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 115377, member: 2852"] I thought I would add an update to the thunder project. I took the beast out recently and was fortunate enough to be joined by Idaho Preacher and his thermal imaging camera! This camera looks into objects and can tell you exactly what the temp of any material is down to the tenth of a degree just by looking at it. VERY COOL camera. Also takes some mighty cool cash to own one and lots of it! The temp was 75 degrees and rising quickly. I had 12 shots of RL22 and 225 accubonds loaded up. I fired 3 shots at a time as fast as the barrel would let me shoot. Here are the stats: 92-95 grains RL22 After 3 shots temp was a cool 72 degrees at the muzzle and 69 at the throat immediately fired next 3 after six shots 97 degrees at muzzle 94 at teh throat next three shots fired immediately after 9 shots 103 at the muzzle 99.5 at the throat next three shots fired immediately after 12 shots 106 at the muzzle 103 at the throat After firing 12 shots, highest temp was 106 and was found at the muzzle. After 9 shots, the throat was slightly warmer than the muzzle but in the time it took to re-shoot the camera (about 15 seconds), the temps reversed as the carbon fiber pulled the heat away from the chamber. In three minutes after firing the 12 shots, the titanium muzzle brake was 3 degrees hotter than any part of the carbon fiber barrel!! Then IP shot his 300 win mag 700 LSS with standard SS factory barrel on it. He is shooting 20 grains less powder and his barrel was 149 degrees after 4 shots! And it was probably 15 minutes before it was down to 85 degrees again. <font color="red"> [i]This carbon fiber absolutely pulls heat out and away from the steel of the barrel at unparalleled speed!! Absolutely amazing![/i] </font> Pictures of the thermal images are being processed and will be posted here shortly. My face in one of the pictures looks twice as hot as my barrel! On another interesting note about the thunder: I have been fighting off the temptation to try some 300 grain MK in this gun but I gave in and tried them. I started at 92 grains of H1000 and went up to 94 grains of H1000. 92 = 2826 93 = 2854 94 = 2872! This was AWESOME speed considering my barrel is only 26" long. 94 grains gave a fairly good ejector mark but 92 and 93 were completely fine. Recoil was noticeably worse than with the 225's or the 250's, but would be tolerable if shooting at an elk. I don't know if I have a fast barrel or not, but the thunder shoots 225's, and 300's faster than the venerable 338 edge and does so with less powder. [img]/ubbthreads/images/graemlins/shocked.gif[/img] If I had a 10" longer barrel on it, it would probably go just as fast as the 338 lapua improved and maybe even go a hair faster! I was really expecting to look over at the chrono and see something around the 2700 fps range and instead it was already above 2800 and no pressure signs. And my lot of H1000 is a tad slower than some previous lots I've tried. I might try some RL25 in it next and see if I can crack 2900. Then again, maybe not. I'm not totally sold on the 338 Mk for hunting and my barrel life is not unlimited. [img]/ubbthreads/images/graemlins/wink.gif[/img] Ah, who am I kidding, I know I'm gonna try it sooner or later! Oh, BTW, I shot the 225 ab's into a nice 4 shot 4" group on the gong at 1145 yards early in the morning before the mirage set in. With groups like that, it's hard to look to another load development session. [img]/ubbthreads/images/graemlins/grin.gif[/img] [/QUOTE]
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