That's what an Anschutz gives, if we do our part.

 

Nice!

 

My experience in rimfire benchrest, and I am not as experienced as a lot of shooters on this site, is that I have pretty much figured out when a flier due to ammo variation occurs. After enough rounds down the barrel with various lots of ammo in various conditions and one can tell when a round that should have been in, is out. All part of figuring out the shooter/rest/rifle/ammo system performance.

 

What does the 10 ring measure, an inch?

 

It all depends on what type of target your shooting.

Ten ring on this BR tgt is 6mm.

 

Perhaps I am just lucky but my Anschutz 1761 MPR gives pretty decent results with much less expensive Lapua Center X and close to the same with SK Standard Plus. Here is a target of 25 single shots with Center X:

Number 25 is not a faked shot. It really did that and boy was I surprised.

 

I have been trying everything I can think of to get rid of that one flier with no success. My best lot is a lot of team producing SDs of 3.4 on 5 round groups and 4.3 average on 25 round strings. There is no visible damage on the rounds. I have run through the magazine and single shot thinking it may be the bolt dragging across the mag fed rounds with no change. I played with headspace thinking it might be a variation in rim thickness. No change as far as the fliers go. I even went so far as to recut the lead in the chamber from a 2 degree to a 1.5 with no change.
My conclusion is there must be something inside the round, whether it is damage on the bullet heel or crimp, or some other unseen difference. I shoot thousands of rounds and month an can usually say when I have a shot that is me, though maybe not always.
Would love to hear from someone who can definitively say they have found a reason.

 

You may have found a solution by now but I had a similar experience with a new 1761 APR. Just could not get it to shoot as well as you expect an Anschutz to shoot using 10 different types of ammo. I finally slugged the barrel and discovered a loose spot about 2/3 down the barrel. Called the Anschutz gunsmith and he sent a new barrel replacement (warranty). Now it will shoot several types of ammo very well, .306" to .355" five shot groups with Eley Match at 50M (as long as I do my part!).

 

The only way to get rid of that one errant round is to get different ammo. Some lots can produce remarkably good results from time to time, but when they are populated with a few or more rounds that have a mind of their own, there's nothing the shooter can do. He can't identify them before shooting.

 

I ordered a case of Lapua long range from Champs today to try against eley match and team.

 

When there are no conditions to miss, sometimes the ammo itself is cause of an outlier.

Below is a 100 yard ten-shot group with the 2013 from this morning when it was quite calm, the flags without any movement or motion. The first nine rounds went into the "group". The tenth round did not, and I uttered an oath.

Interestingly, that tenth round, at 1062.2 fps, was hardly the slowest round of the ten. Five had slower muzzle velocities.

Groups like this are not uncommon at 100 yards. Eight or nine rounds go into a small group, but one or two don't.



Soon I had a more rewarding ten-shot group. It outside-to-outside dimensions measured 0.690".

 

Yep. Been there, done that.

 

All I can reply is - fliers happen, even with the best ammo. Sometimes, they really can break your heart but that's just the way it is:

 

From this morning with the same rifle, but different lot of Midas. Ten-shot groups at 100 yards. Those outliers sometimes seem like real spoilers.

 

And I have to tell you, every lot of Midas and Center X I have tested , 8 in total all have velocity spreads less that 30 FPS so I doubt its velocity spread. But as you know, that ain't all of it. BTW my targets are also Midas and you see shots not in the group.

 

Just an amateur so take my tuppence worth for what it is.

Shooting last week at 50m, doing great, lots of tens and a few nines, happy but on occasions shots were either high or low. Checked the flags (first at 10m, second at 30m), no issues, all good, think I read flags/wind properly, still had some high/low 5’s/6’s.

When changing targets I always walk up in line with my flags, wind was as I expected from the two flags, then, last 10m just before tgt and wind was crazy, gusting on/off from all directions. Next time I shoot I’ll be setting a wind flag far closer to the tgt.

 

"They also have boxes with spreads well over 30 fps "
That's a surprise. You would think within a lot when they are supposed to all be from the same setup, that they would all look alike within the the lot.

In stuff that has a wide velocity spread, they "tend" to follow MV in elevation because the dispersion is so dramatic. But I agree, spread is not the only issue. When I say "a lot need to have less than 30 MV spread to be a good lot", I also say, "just because a lot has less than 30 FPS doesn't mean it will be a good lot". in testing I have had lots less than 30 FPS spread that I would not touch.

 

It wouldn't be as much of a surprise if more shooters chronographed more than a few boxes of ammo.

Below is chronograph data obtained this season with Lapua Midas. Since this is the Anschutz forum, only the data gathered with Anschutz rifles is shown.

 

Just out of curiosity, what are the barrel lengths of each rifle in your data sets? And were there significant temperature swings between dates. It's strange that the 1913 had significantly lower velocities for 2 lots.

 

The temperature swings referred to are temperature related. The morning I shot the lot ending 333 with the 1913, the temps were just below freezing. That rifle barrel is the same length as the 2013 barrel, 69 cm or 27.16".

As it happened I mostly used my 1913 in October when temps in the mornings were cooler. If the 2013 average MVs are compared between mid-summer and October, the cooler month produced slower MVs.

As a general observation, with each rifle a second box of the same lot it was a little faster than the first because the temps almost always rose. Even a few degrees makes a difference.