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Nosler Accubond Long Range problem

 
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  #148  
Old 09-12-2013, 11:24 PM
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Re: Nosler Accubond Long Range problem

Still would recommend switching things up but not with powder choices. Powders could produce SLIGHTLY different group sized but your generally not going to see DRAMATIC reduction in group size with a simple powder change as long as all powders are in an appropriate burn rate range for the chambering being tested which all mentioned have been.

I recommended long ago to switch bullet designs and see what happens. I would love to see what this rifle would do with the 150 gr Bergers. Being a rifle manufacturer, I tend to look at solving rifle accuracy problems instead of bullet accuracy problems so my goals are generally directed toward finding what a specific rifle prefers more then trying to figure out why a specific bullet WILL NOT shoot. It will be good to find out the problem though.

Again, switch things up dramatically with a completely different bullet design and see what a conventional cup jacketed/lead core bullet will do in the same rifle.
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  #149  
Old 09-13-2013, 12:16 AM
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Re: Nosler Accubond Long Range problem

Quote:
Originally Posted by Fiftydriver View Post
I bit curious how you can say that 64.0 gr is the load that should be used in a rifle you have no experience with? Not trying to flame you in any way but its impossible to tell someone what load will work best in their rifle.

H4831SC is on the faster side of burn rate for a 150 gr 270 WSM but it should work extremely well.

Again, no disrespect, just impossible for someone to tell someone else what is best for their rifle without testing loads in that specific rifle.
The reason I said that 64 grains is the load he should use is because he has tested the loads (see the results of his tests several posts back) and 64 grains gave the best group with a small velocity spread. It is not impossible to tell someone else what load should be used in a rifle I have no experience with, if he has himself tested that same rifle.
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  #150  
Old 09-13-2013, 12:20 AM
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Re: Nosler Accubond Long Range problem

I've shot new manufacture Wildcat bullets, a couple of years ago in NV that patterned better than 8" @ 20 yards. That's a one shot pattern.

I've killed 3 chronys but it was my fault every time.

I've weighed and sorted winmag's LRABs. Their baring surface seems to be about 0.10" shorter than the 150 Bergers so I'll start out with the COAL that the seating die is already set at (same setting for 150 berger and 169.5 WC)

The initial powder charge will be 82 grains of 7828ssc which pushed the 150 Berger to right at 3500 and sub 1/2 MOA @ 200 yds.

This barrel, the second one on this action, from DerekM in Ohio, is 2" shorter and lighter contour than the original.

Differences between this barrel and possible different throat than the original barrel are:

New barrel shoots Bergers very well @ 3500. Original barrel shot the same Bergers in large banana shaped groups.

This barrel though 2" shorter produces same velocities with same charges as the original 30" barrel.

New barrel is just as accurate as the shot out original was in its hay day.

I called off my trip to the hills to tune up for going a mile with the 375 to work on this project.

Should be a fun day.
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  #151  
Old 09-13-2013, 12:24 AM
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Re: Nosler Accubond Long Range problem

I agree with trying the 150 Berger VLD Hunting projectiles. I'm shooting these at 3300 fps in the 270 Dakota and getting 4 and 5 shot groups consistently at around 0.6 inches.
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  #152  
Old 09-13-2013, 01:03 AM
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Re: Nosler Accubond Long Range problem

Quote:
Originally Posted by Fiftydriver View Post
If your using the 7mm Dakota parent case for your 270 Dakota, your case capacity is far larger then the WSM and for that application, I would agree, that H-1000 or Retumbo would be better choices but for the relatively small case capacity of the WSM, H-4831 or its SC version are just fine. I think your focusing to much on powder choice. Powder selection will not take a 4" group down to a 1/2" group.
With the 150 grain projectiles in the 270 WSM, The Hodgdon Reloaders' Guide gives maximum loads as:

Retumbo 70g 3071 fps 63000 psi
H1000 67.5g 3001 fps 62,800 psi
H4831 60g 2962 fps 63,100 psi

This is consistent with my own findings that when moving to the 150 grain projectiles from 130 and 140 grains, Retumbo or H1000 gives better results than H4831sc.
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  #153  
Old 09-13-2013, 04:49 AM
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Re: Nosler Accubond Long Range problem

Engineering101,

In your first post you stated that you used 60 grains of 4831sc with the 150 Accubond in your 270 WSM and this was accurate. This is a maximum load as seen in my post above. When you went above this maximum load,( by a few grains I suspect to get over 3000 fps) the accuracy disappeared. I think that the design of the 270 WSM case (much like Ackley Improved cases) might be masking the excess pressure so you are not seeing it by the usual pressure signs. However, I get the usual pressure signs when I load more than the maximum load of 67 grains of 4831sc with the 130 Accubond in my 270 WSM. If you switched and worked up slowly to 70 grains of Retumbo, I think you would get over 3000 fps without the problems with the 150 grain LR Accubond when using more than 60 grains of H4831sc.
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  #154  
Old 09-13-2013, 08:56 AM
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Re: Nosler Accubond Long Range problem

Quote:
Originally Posted by longarm View Post
The reason I said that 64 grains is the load he should use is because he has tested the loads (see the results of his tests several posts back) and 64 grains gave the best group with a small velocity spread. It is not impossible to tell someone else what load should be used in a rifle I have no experience with, if he has himself tested that same rifle.

I would agree, with the information he is getting, the lower pressure loads obviously are the correct ones to use. It seemed like you were recommending a load from your experience, my mistake.

I do feel that 4831SC is a very good powder for this combo however.

Also, the OP wants to find out whats wrong with this bullet or rifle as there should be NO problems pushing a Nosler bullet over 3000 fps, hell, 4000 fps should be fine. The goal is not to pick the best of these loads. Whats to find out why everything is coming totally apart at +3000 fps which a lot of us want to know.
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

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