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Re: 260AI??? [Re: BigPig] #7404076 01/14/19 02:55 PM
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Judd Offline
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All I know is they are accurate. A buddy of mine has fell in love with the caliber and is shooting it in benchrest competitions and whipped my donkey more than enough for me to know accuracy wise it'll hang. I don't know anything about mag length or any of that as most of us shoot single shots.


Originally Posted by Phil Robertson
Don't let your ears hear what your eyes didn't see, and don't let your mouth say what your heart doesn't feel
Re: 260AI??? [Re: BigPig] #7404077 01/14/19 02:55 PM
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No offense to those who have and shoot them but tested without pressure testing is just guessing.


It's hell eatin em live
Re: 260AI??? [Re: BigPig] #7404083 01/14/19 03:00 PM
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So you pressure test each of your hand loads to determine max load? That’s rather surprising. I never had the pleasure of using the equipment for it. I rely on the traditional signs of excessive pressure.

Re: 260AI??? [Re: wp75169] #7404090 01/14/19 03:04 PM
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Originally Posted by wp75169
So you pressure test each of your hand loads to determine max load? That’s rather surprising. I never had the pleasure of using the equipment for it. I rely on the traditional signs of excessive pressure.

No not a one, but im not trying to generalize and say that a 260 ai is only 50 fps faster than a 260 or similar with the others by sticky bolt lift etc. etc. They are making definitive statements which I don't believe they have the knowledge Information to make. Don't mean to say they aren't intelligent and good at what they do, but making those kind of claims requires fine data that you just cant obtain in my opinion without pressure testing and scientific type analysis.

Last edited by redchevy; 01/14/19 03:09 PM.

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Re: 260AI??? [Re: BigPig] #7404105 01/14/19 03:11 PM
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I know of only one person on this forum with pressure testing equipment and it sure isn't me. Even if going with published loads with listed pressure, that is the pressure in the test guns not in on the reloader owns so to an extent we are just about all guessing.

Pressure and velocity are related though and if a reloader gets higher velocity that published reloading data then their load is suspect to pressure levels.


lf the saying "Liar, Liar your pants on fire" were true
Mainstream news might be fun to watch
Re: 260AI??? [Re: redchevy] #7404121 01/14/19 03:34 PM
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Originally Posted by redchevy
Originally Posted by ChadTRG42
I knew several shooters who went 260 AI for their comp rifles, mainly Terry Cross. We spoke about it years ago (after they wrote his article about it), and the gain over a normal 260 was right at 75-80 fps with the same H4350 powder. If you went to a double base powder, like the R17, R26 or similar powder, you can gain more than 75 fps over the H4350, but you could also start with a double base powder to begin with. The consensus on the 260 AI was that the minimal gain was not worth the head ache of fire forming and such with normal temp stable powders. You can always improve the speeds with a double base powder, at the risk of being temp sensitive.

Most of the time when you go to an AI, you gain about 80-100 fps. The 7-08 AI rounds with Varget we have gone to yield about 120 fps gain with the 162 grain bullets. Heavier bullet and higher yield does make it a little more attractive.


I wish there was real load work up with pressure testing done. It makes zero sense to me that a 260 ai only gains 50% of what a 7mm-08ai does even though its the same case and dimension except the diameter of the bullet. confused2



Well, you're comparing two different powders, for one. Also, 80/120 is not 50%, it's 67%, even with the powder difference. Are the barrels the same mfg and rate of twist per bullet length/weight? You start getting into bearing surface and the extra pressure of the smaller bore and a lot of physics starts coming into play. Lots of places for explanation between the two numbers. Could be the .260 is more efficient to start with, and thus the 7-08 catches up more when you go AI?


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Re: 260AI??? [Re: QuitShootinYoungBucks] #7404128 01/14/19 03:43 PM
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Originally Posted by QuitShootinYoungBucks
Originally Posted by redchevy
Originally Posted by ChadTRG42
I knew several shooters who went 260 AI for their comp rifles, mainly Terry Cross. We spoke about it years ago (after they wrote his article about it), and the gain over a normal 260 was right at 75-80 fps with the same H4350 powder. If you went to a double base powder, like the R17, R26 or similar powder, you can gain more than 75 fps over the H4350, but you could also start with a double base powder to begin with. The consensus on the 260 AI was that the minimal gain was not worth the head ache of fire forming and such with normal temp stable powders. You can always improve the speeds with a double base powder, at the risk of being temp sensitive.

Most of the time when you go to an AI, you gain about 80-100 fps. The 7-08 AI rounds with Varget we have gone to yield about 120 fps gain with the 162 grain bullets. Heavier bullet and higher yield does make it a little more attractive.


I wish there was real load work up with pressure testing done. It makes zero sense to me that a 260 ai only gains 50% of what a 7mm-08ai does even though its the same case and dimension except the diameter of the bullet. confused2



Well, you're comparing two different powders, for one. Also, 80/120 is not 50%, it's 67%, even with the powder difference. Are the barrels the same mfg and rate of twist per bullet length/weight? You start getting into bearing surface and the extra pressure of the smaller bore and a lot of physics starts coming into play. Lots of places for explanation between the two numbers. Could be the .260 is more efficient to start with, and thus the 7-08 catches up more when you go AI?


That's my point, there are way too many variables at play to make the blanket statement that 260 ai is only x fast than 260 and 7mm08 ai is x faster than 7mm-08. The huge discrepancy between incredibly similar cartridges indicates to me that there is more playing with other factors other than AI case design that are affecting it. That's my opinion, id love to see the pressure data behind it.

I don't have the equipment, I don't have the money (that I want to spend on it), and I don't have the time. If I did it would be a fun project, but for now ill just have to dream.


It's hell eatin em live
Re: 260AI??? [Re: BigPig] #7404131 01/14/19 03:48 PM
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It would definitely make for a fun project, RC! If I was wealthy and retired, this is the type of stuff I would mess with.


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Re: 260AI??? [Re: J.G.] #7407025 01/17/19 01:13 PM
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Originally Posted by FiremanJG
Originally Posted by Korean Redneck
I have absolutely no experience in owning any of these but I do plan on getting a 6 5 bore rifle at some point. Couple that with the fact that reloading isn't as hard and, more importantly, more entertaining than o thought. So I definitely want a non typical caliber.

6.5cm is exactly what I'm sure everyone says it is but to me isn't cool anymore. This 260ai and 65.x47 seem cool. I presume with habdloading one can make it just as accurate.


The cool factor of the 6.5X47 is an incredibly consistent shooter. Plus brass that lasts an insane amount of firings. My good friend Dave has ran a 6.5X47 for many years. I asked him last year "how many firings do you have on that brass?" He said after 15 he quit counting. He has worn out more than one barrel using the same brass. He annals every firing, so that is a major help.

Built my daughter a 6.5X47 last year. It's not gonna make the velocity of a 6.5 Creedmoor, but it easily makes ammo that has ES in the single digits.


I love my 6.5x47, 4-6 firings on brass, and have not even had to lengthen brass, and it still looks awesome The consistency is stupid. The velocity is running 2950 with Berger VLD-H with no pressure signs.

Re: 260AI??? [Re: BigPig] #7407028 01/17/19 01:15 PM
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What bullet are shooting bobsumner?

Re: 260AI??? [Re: wp75169] #7407040 01/17/19 01:28 PM
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Originally Posted by wp75169
What bullet are shooting bobsumner?


And barrel length?


Joe
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