Brand new Winchester Mod. 70 Black Shadow in .300 Ultra Mag.This has to have the cheapest plastic stock on it I have ever seen outside of the young boys toys aisle in Wal Mart.

New Remington brass, completely benchrest prepped (primer pockets uniformed, primer hole chamfered, neck turned, trimmed and all cases within 0.01 gram of each other).

The factory fodder is pretty good. Or the 150 grain XLC Barnes are just bad.

The AA-8700 is obviously not the stuff for this rifle. Would have had three holes but for the very first time in my life, I had a primer fail to go bang.

Here is the RL-25. I didn't shoot the other 101 grain load as I was starting to get some raised edges around the firing pin dent.


All in all I was not impressed. I think I need to get rid of the whippy barrel and invest in a nice, stiff McMillan A-5 stock, and a Jewell trigger.

Maybe it just doesn't like the light bullets.

That is a good group for the factory ammo though.

The mod 70 classic that I had had a black shadow barrel on it.
I chronographed the 180 factory partitions at 3300 FPS .

That would be a shame too, since the lightweight bullets really smoke out of this rifle. I have been looking for my notebook since yesterday, I wanted to put up the velocities too, but can't find the &^&%$%%^thing.I do remember the 180 grain factory were 3200 and the 200 grain was 3050 or so.

I recently read that the .300 Ultra is very accurate with heavy bullets, but that it is sensitive to the distance to the rifling. Because of this, they sometimes don't shoot the smaller (and shorter) bullets as well.

You might try seating the bullets further out and using a Lee Factory crimp. The Barnes (that you've tried) are supposed to be longer for a given weight, but maybe the lightweight TSX's are even longer given the cuts in the shank. Might be worth a try to get a longer lightweight bullet to get closer to the lands.

Steve

that rig will come alive with bullets in the 200+ grain range. Mine loves a 200smk with 88.0gr H1000 and a 216gr with 90gr retumbo. Don't waste your time with the 180gr class in that chambering, you could use a 300win for that. Push her with some 200gr accubonds and see how she does.

Try 85 gr of 4350 ( I used XMR4350) with a 150 or 165 gr Sierra if you want a light bullet load. Seat them about .030" off the rifling to start with. I bet you may have some success with that load. Please let us know.My Savage .300 RUM gives me .6 MOA with that load.

I have some 150 grain HPBT Sierra's I will try that light load.

AND

I have a box of 190 grain Berger VLD and a handful of the 210 VLD's they sent me as a tester.

I will try both loads, thanks for the tips.

I still think it would do real nice with a fat Kreiger tube put on by a real benchrest 'smith. All I have to do is find one that will do a Mod. 70.