Re: Nosler Accubond Long Range problem
Just got back from the range with the results of shooting 150 gr Nosler Ballistic Tips in the 270 WSM. I started with a clean/cold barrel and fired 1 fouling shot followed by 4 three shot groups at 200 yards. I let the barrel get slightly warm but never more than that. The ES of velocities for all groups was right around 20 fps – so not horrible. Loads (all Ramshot Magnum), average velocities and group sizes were as follows:
68.5 gr/2,984 fps/2.218”
69.0 gr/3,005 fps/2.906”
69.5 gr/3,038 fps/2.343”
70.0 gr/3,067 fps/4.531”
All groups but the one with 69.0 gr had two shots about 0.5” apart and then one flyer to open up the group. A classic indication that there is some barrel vibration going on.
This performance sucks and I need to see what these bullets do running closer to 2,900. I’m guessing that they will shoot a lot better as did the 150 ABLR bullets however all shots today landed on my 8.5” X 11” target paper whereas the ABLRs wouldn’t stay on 4 of those targets thus I don’t know what group size they shot when they went bad but it had to be at least a foot to miss all that paper.
Conclusion: The 150 ABLRs shoot MUCH WORSE than the Ballistic Tips in this rifle while running similar velocities. What does that mean? Beats the hell out of me. Maybe this barrel does have a harmonics issue as Kirby suggested and the 150 ABLRs just really hate barrel harmonics. Now what? I suppose I’ll run them down around 2,850 fps and call it good. Then again, with all this messing around I’m about out of them so the problem may just go away for this hunting season as I likely won’t be able to get any more of these ABLRs until Nosler does another production run next year.