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25-06 vs 25-06AI

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  #43  
Unread 01-22-2010, 12:11 AM
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Re: 25-06 vs 25-06AI

Quote:
Originally Posted by elkaholic View Post
I'm pretty sure the 5r and 5c are both trapezoidal lands, just different manufacturers??
Description taken from the following,
The Remington Model 700 Stainless Special 5R Milspec

"5R-rifling features a radius'd shoulder between the lands and the grooves. Advantages are claimed to be a smoother engraving transition on the bullet jacket which, in theory at least, creates less drag in flight - which means possibly a slightly flatter shooting bullet compared to a bore of standard rifling profile. The second benefit is cleaning. Without the 90-degree angles between lands and grooves, fouling seems less likely to adhere as tenaciously to the bore. Copper fouling may also be reduced. This rifling profile is used in the Army's M24 Sniper rifle. It has a proven track record for accuracy at long range, often making M.O.A. or better shots possible to 1000 yards."

and here is another on the 5C from 6mm BR,
Canted Land Rifling

Also if you google either, you will find several post including some here, about both.
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  #44  
Unread 01-22-2010, 12:59 AM
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Re: 25-06 vs 25-06AI

Quote:
Originally Posted by 41mag View Post
Description taken from the following,
The Remington Model 700 Stainless Special 5R Milspec

"5R-rifling features a radius'd shoulder between the lands and the grooves. Advantages are claimed to be a smoother engraving transition on the bullet jacket which, in theory at least, creates less drag in flight - which means possibly a slightly flatter shooting bullet compared to a bore of standard rifling profile. The second benefit is cleaning. Without the 90-degree angles between lands and grooves, fouling seems less likely to adhere as tenaciously to the bore. Copper fouling may also be reduced. This rifling profile is used in the Army's M24 Sniper rifle. It has a proven track record for accuracy at long range, often making M.O.A. or better shots possible to 1000 yards."

and here is another on the 5C from 6mm BR,
Canted Land Rifling

Also if you google either, you will find several post including some here, about both.
I don't know about the broughton, but according to the folks at bartlein, their barrel (5r) is not radiused, but trapezoid shaped, which also gives less angle at the land groove junction. I believe the "R" came from Russian where it was first used years ago in their military rifles....Rich
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  #45  
Unread 01-22-2010, 11:16 PM
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Re: 25-06 vs 25-06AI

Ive been loadong 58 grains of 7828 inmy 25 ai and am right up there with the 257 weatherby, reloaders nest has quite a few loadings for it with the super slow powders but as always use common sense and caution, some of the loads they list border on insanity and velocities that some of the loads claim are best described as ridiculous
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  #46  
Unread 01-23-2010, 12:52 AM
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Re: 25-06 vs 25-06AI

Quote:
Originally Posted by swiftackley View Post
Ive been loadong 58 grains of 7828 inmy 25 ai and am right up there with the 257 weatherby, reloaders nest has quite a few loadings for it with the super slow powders but as always use common sense and caution, some of the loads they list border on insanity and velocities that some of the loads claim are best described as ridiculous


Yes, a couple of those Rel. Nest loads look a little much.

What bullet are you using & what vel?
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  #47  
Unread 01-23-2010, 09:14 AM
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Re: 25-06 vs 25-06AI

Reading those loads on Reloaders Nest is what got me to posting the question on can a .25-06AI be loaded up to a .257 wby velocity. Those loads of 7828 kind of scared the poop out of me to even try to think of using them. Had never intended on trying to make a Wby out of my rifle but was wondering if it was possible to get to 3400. Those loadings showing 3600 :o) WOW. Wonder how long the throat will last in that barrel and just what kind of pressures he was getting.
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  #48  
Unread 01-23-2010, 09:18 AM
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Re: 25-06 vs 25-06AI

I was reluctant to post my load until until I finished testing but settled on 59 grains of 7282 ssc for now. Tested in 1/2 grain increments. Slightly heavier bolt lift at 59.5 I stopped at 60.5; I've got a few I need to pull. 59.0 gave the best accuracy thus far @ 200 yds. I haven't continued with this due to weather, hunting season, work, kid's athletics, ect. ect. Again, my loads were with 110 Accubonds and the Barrel is a Rock. Chrono and ladder test to come.
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  #49  
Unread 01-23-2010, 11:58 PM
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Re: 25-06 vs 25-06AI

My load data for 7828sc, WIN 270 Brass, CCI 250 primer, 115 Berger VLD seated .040" from lands. Use caution as these may not be safe loads in your rifle.

25-06 AI, 26" Shilen 1-10 twist barrel.

58g = 3230-3260 FPS
59g= 3375
59.5g= 3418-3454
60g= 3454-3481 60 Degree day
60.2g= 3392-3427 45-50 Degree day
60g = 3463-3499 Hot load sticky bolt lift 75 Degree day

All same except CCI BR2 primer and seated @ rifling

60g= 3454-3463 Group sizes and verticle spread shrunk in half. Still no where near as accurate as IMR-4831.

The guy on reloaders nest is either insane or his chronograph is broken. I believe he is using nickle plated brass. As you can see 7828 spikes pressure very quickly and you need to be very careful. Gaining rougly 100 fps with 1 extra grain of powder

Last edited by Nitroused383; 01-24-2010 at 12:08 AM.
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