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6.5-284 never did it for me, SA caliber that needs a LA to do what it claims. Have a gaggle of 260s... they're the every day workhorse from a true SA. Also pretty well acquainted with the 264, have had several, only have 1 right now... but have to admit with less than a 26 or 28 tube a 6.5-06 crowds it pretty hard with less powder. Recently built a 6.5-300 RCM. True short action, feeds like butter, case designed for 65ksi, capacity trumps the 06, Rem mag, and 284 by 4 grains or so. If one has to ask why, for a Ruger and 6.5 slut it was a natural progression. Logic need not apply...
"Your range of experience runs that gamut from A to B, plus you're a nitwit. That's a hard combination to overcome, though some people try." - JB
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6.5/7 Mag AI
120's at 3650-3700 fps
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Joined: Feb 2007
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Campfire Ranger
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WOW, just how far do you need to shoot something ![wink wink](/ubbthreads/images/graemlins/default/wink.gif) When I had a 7mag, 115s at 3375 was hot/fast/flat, but LOUD and a good bit of recoil. Do you use a brake?
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A gunsmith down in Dalton Ga made a good living building these custom rifles for deer hunters that liked to hunt power lines.
I went down to pick up a 7 STW from him and there were 5 of these guys in the shop talking bullets, barrels, etc.
Between the 5 guys, they had made 64 one shot kills on deer, with NONE needing a second shot.
What is even more amazing, they all shot the 120g Match King!
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6.5/7 Mag AI
120's at 3650-3700 fps dream on...
Guns don't kill people, drivers with cell phones kill people.
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Joined: Apr 2007
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I did some research and can't find one word on this 6.5/7 mag AI. The 7 mag is the same case as the 264 so they should have the same powder capacity. It would seem to be re-inventing the wheel.
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yes and yes.
you'd have to push the 6.5-.300 Weatherby pretty hard to get those speeds with 32" barrel, and that would only be possible because the Wby cases are good to 65K psi and have quite a bit more capicity
Guns don't kill people, drivers with cell phones kill people.
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Joined: Mar 2010
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Campfire Outfitter
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264 I agree I looked this one up in my "Ackley volumes and the only thing that comes close is a 7x61 Sharpe and Hart necked to 6.5..with almost identical 264 win mag ballistics...these belted cartridges in this group have almost equal case capacity except of course for the Weatherby's.....FLEM
You better be afraid of a ghost!!
"Woody you were baptized in prop wash"..crossfireoops
Woody
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Maybe we could have a super 6.5 by necking down the 50 BMG to 6.5 except I don't think the bullets would stay in one piece at the speeds you could push a 100 gr bullet. I wonder how many grains of H4831 it would hold just thinking 300 to 400 grains. Thats got to be a big bang for the buck.
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Campfire Outfitter
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Yea...and you'd have to have a set of wheels on that 60 inch barrel!!!!
You better be afraid of a ghost!!
"Woody you were baptized in prop wash"..crossfireoops
Woody
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Just put a H2 under it with a 360 rail and turret. We would be taking rock chucks at 3000 yrds.
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You better be afraid of a ghost!!
"Woody you were baptized in prop wash"..crossfireoops
Woody
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We could call it the 264 super mag and sell a package H2 and mounted gun say for 150G. LOL
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All craziness aside what is your all time favorite 264 load in say 140's
You better be afraid of a ghost!!
"Woody you were baptized in prop wash"..crossfireoops
Woody
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I hate to say it but the only 140 hand loads were given to me and they were the partitions with 64.8 gr H4831 and they shot great. My favorite is the 100gr HP with 72 gr H4831.
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Checked my notes again that he gave me, I made a mistake, the velocity was 3550-3600, depending on the barrel, 26" barrels only.
One guy had a 28" barrel and he was getting 3650. The Gunsmith had a special name for the cartridge that he had made up, but it was a 6.5/7Mag AI. They were using Weatherby 257 brass, which is soft. I got them some 257 Weatherby brass made by PMC, and they were all very happy because it is MUCH harder and would take the pressures.
I have no actual experience with the cartridge, but he did show me targets with Ohler 35P print outs of the velocity. More important, the guys standing there were the testimony of what the cartridge would do.
I was able to best his wild cat with my 7 STW shooting the 140's at speeds I won't speak of using PMC 300 Weatherby cases, which are tough as nails.
Pacific Tool and Grinding made this guy's reamers, that is where I would start to do the research on...they keep files on reamers and will mail a print.
Last edited by keith; 08/14/10.
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That 100 HPT must really be movin on!! Did you ever graph it???
You better be afraid of a ghost!!
"Woody you were baptized in prop wash"..crossfireoops
Woody
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the .264 Win. is within 2 grains capacity of the .257 Wby.(82 grains H20 vs. 84 grains H20). so i don't see huge gains coming from a step up like that, even with the step up to 65000 psi pressure of the weatherby parent case.
for conversation, let's take the 6.71 Lazzeroni BlackBird, a case that has 105 grains H20 capacity and load it to max pressure (63817 psi or 4400 BAR) via 82 gr RE 25 under a 120 NBT. ~3383 fps from a 26" tube.
Guns don't kill people, drivers with cell phones kill people.
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I shoot the 140 C/T bullets & over max loads of IMR 7828 in Winchester 7 STW brass or Fireformed 300 Weatherby to 7 STW. Only the C/T bullets will get this speed, go to the same bullet in 140g Ballistic tip and max load is much less due to pressure issues.
My "graph" is a Ohler 35P and a Pact Professional with Ohler Screens.
Bob Sutton was the name of the gunsmith in Dalton, Ga that was building these 6.5 wild cats.
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I don't have access to a crono so I am not sure how fast but the 30 inch barrel should be using all the powder. I just finished sight in at 60 yards with my new Nikon scope I really surprised my self as I bore sighted it the old fashioned way by looking down the inside of the barrel and my first shot was 2 inches left and dead on for elevation. I was able to hit a cantelope size rock with a 95gr VMax at 300yrds first shot after sight in. I really like the Nikons sight picture and side Knob focus.
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