Normal velocity from Lapua Midas +

[jsdkms]

Was out yesterday and my chromo was giving me a velocity of only 1030 out of an Annie 20" barrel. All my other rifles usually give me 1070 or so? It was a new gun so perhaps it needs more rounds down the tube? Any thoughts?

 

[Ranger188]

Different barrels and different lots of a company will give different velocities.
That's why it's hard to find the right ammo for each rifle that it likes to shoot.
Don't get hung up on fps, look for what shoots the smallest in each rifle.
Then trying to find more of that same speed or lot is the hard part.
Cause by then it's usually sold out.
Midas, Center x all sell quickly.

 

[Straightshooter1]

Was out yesterday and my chromo was giving me a velocity of only 1030 out of an Annie 20" barrel. All my other rifles usually give me 1070 or so? It was a new gun so perhaps it needs more rounds down the tube? Any thoughts?

Do your other rifles also have a 20" barrel?

My data shows that the longer the barrel goes out beyond 18" the slower the velocity. In addition, like what Ranger188 said, different barrels and different lots of ammo can produce different velocities.

 

[jpjulian]

I chronographed an older box of Midas+ in my CZ457 MTR on Saturday. 30 shot string was 1089.6 fps, ES 78.2, SD 14.7. 20 shot string was 1090.9, ES 34.6, SD 10.1.
It was a fairly light breeze that day and my CZ didn't really like that lot of Midas. Groups included a number of shots with significant vertical, high and low, and blew the groups.

 

[TRSR8]

Different barrels and different lots of a company will give different velocities.
That's why it's hard to find the right ammo for each rifle that it likes to shoot.
Don't get hung up on fps, look for what shoots the smallest in each rifle.
Then trying to find more of that same speed or lot is the hard part.
Cause by then it's usually sold out.
Midas, Center x all sell quickly.

Speed has zero to do with quality lot selection….zero.
Base your criteria primarily on that, you’re headed down a dirt road, plus, lots that show the same label speed rarely are.

 

[grauhanen]

Was out yesterday and my chromo was giving me a velocity of only 1030 out of an Annie 20" barrel. All my other rifles usually give me 1070 or so? It was a new gun so perhaps it needs more rounds down the tube? Any thoughts?

Barrel length doesn't dictate ammo MV, it's only one of several factors. In addition to length, bore characteristics are major factors.

To illustrate, I have two barrels made by the same manufacturer, Anschutz. With the same lots, one is consistently slower than the other. I have two other barrels, both the same length but made by different manufacturers, one by Bartlein, the other by Lilja. Again, one is consistently slower than the other.

Performance is not affected.

 

[shoot4fun]

Was out yesterday and my chromo was giving me a velocity of only 1030 out of an Annie 20" barrel. All my other rifles usually give me 1070 or so? It was a new gun so perhaps it needs more rounds down the tube? Any thoughts?

I own a Fortner action Anshutz and several shooting friends own the 54's. Most are 22" or so barrels.
Shooting Lapua Long Range 36 speed in my 22" Anschutz my most recent data was actually 3FPS faster than the 36 Speed supposed velocity(1102 rated but 1105 actual). Now for the odd results. I shot Lapua LR 35 speed rated 1099 FPS but actually saw higher velocity (1122FPS) in mid August. Slower ammo turned in faster speed?
BUT, a month later that same ammo in that same rifle in the middle of July only gave 1093FPS (a pretty wide variance).
Now compare 32 speed Lapua LR in a CZ457 MTR. That ammo is a consistent 1120 FPS in the 20" MTRand only 1085 in the 1727 on the same day.
How many rounds down the Annie barrel compared to your other rifles?
My bench rest set up is a Lodestar 2500 with a 20" Shield Racket and I am shooting 27 speed Midas+ there. While rated at 1071FPS the 20" Ratchet over 68 rounds came in at 1083. So not a big variation like you see in your Anshutz.
What does all this prove? I think it proves what was said already. Different barrels give different results and 22LR velocity is definitely not DDSR (different day same results).

 

[collectoid]

Yep....all barrels are different. A Shilen ratchet is different from a 2 groove Benchmark which is different from a factory Anschutz. The rifling is totally different in all of them which would yield different mv. As stated above, mv really has nothing to do with accuracy.

You should always test your ammo in your specific rifle. Find the best match then fine tune the tuner. I then chrony to get a baseline for the ammo. If I see a change in performance, I chrony again to see if there are any changes. Changes can occur from a number of reasons (mechanical such as firing pin spring or ammo degradation over time). Baseline chrony results give a good indication of accuracy problems that are not caused by wind or tuner settings.

It was interesting to see the chrony results of the older Midas +.. They are no where near where new Midas should be performing. Generally, the Midas plus should chrony at a SD between 5-8fps and ES of about 20-25. The velocity on the box is an index number that was shot out of Lapua's test rifle. It may not be the same out of your barrel and rifle but it should differentiate faster ammo from slower ammo based on the first 2 numbers of the serial number. If you put a 3 in front of these 2 numbers you will get the velocity in meters per second.

 

[Multiracer]

A chronograph is a tool for your own use. Your barrel will record good and bad speeds, the high velocity goes high on the target, the low velocity go low on the target, the average speeds 1070-1078 go in the bullseye. Your buddies barrel that is longer will show different results.... so use the information for your own use, no one else's.

 

[PWNolan]

....the high velocity goes high on the target, the low velocity go low on the target....

Sometimes this is true but often I see exactly the opposite. I thought it was because I had only used the Garmin with rifles that had tuners. Saturday I used the chronograph while I shot my T1x and one of my Anschutz 1416 AV. The phenomenon was even more pronounced.

 

[grauhanen]

Sometimes this is true but often I see exactly the opposite.

This probably happens more often than most shooters realize. The POI and MV don't always have a consistent relationship. Slower rounds can impact higher than faster ones and vise versa.

 

[Hi-NV Shooter]

Sometimes this is true but often I see exactly the opposite. I thought it was because I had only used the Garmin with rifles that had tuners. Saturday I used the chronograph while I shot my T1x and one of my Anschutz 1416 AV. The phenomenon was even more pronounced.

Fast exits sooner slow exits latter. bullet exit timing!

Lee

 

[Appalachian]

Slow rounds hit high for me at 50 yards.

 

[shoot4fun]

I most always have my Garmin Chronograph running when I shoot any of my 22LR rifles. I won't be specific about the "patterns" I see from velocity but I will say you can tell as much about the entire rifle with a Chronograph as you can about the ammo and/or barrel. Watch specifically for cold bore, clean bore, how long the bolt was open before the shot and other things that occur around the shots that produce the data 30-40FPS slower than the rest. Let your Chronograph run for long sessions, as many as 70-75 rounds. You will see things that will make a difference if you can learn to control them.

 

[Multiracer]

I most always have my Garmin Chronograph running when I shoot any of my 22LR rifles. I won't be specific about the "patterns" I see from velocity but I will say you can tell as much about the entire rifle with a Chronograph as you can about the ammo and/or barrel. Watch specifically for cold bore, clean bore, how long the bolt was open before the shot and other things that occur around the shots that produce the data 30-40FPS slower than the rest. Let your Chronograph run for long sessions, as many as 70-75 rounds. You will see things that will make a difference if you can learn to control them.

I watched a guy rapid fire ten shots as sighters ...then he started for score. No more cold bore for him.

 

[grauhanen]

I most always have my Garmin Chronograph running when I shoot any of my 22LR rifles. I won't be specific about the "patterns" I see from velocity but I will say you can tell as much about the entire rifle with a Chronograph as you can about the ammo and/or barrel. Watch specifically for cold bore, clean bore, how long the bolt was open before the shot and other things that occur around the shots that produce the data 30-40FPS slower than the rest. Let your Chronograph run for long sessions, as many as 70-75 rounds. You will see things that will make a difference if you can learn to control them.

A cold or clean bore shot is usually faster than average.

ES can vary between boxes of match ammo from the same lot. SD can vary too.

Unless you can somehow know the MV of rounds before they are actually shot, it's impossible to determine a pattern or relationship between ammo velocity changes and length of time the bolt was open during the normal course of shooting.

 

[Hi-NV Shooter]

When I saw the title of this thread, I asked myself why it would matter. in rimfire ammo what is normal? velocity deviation/differences are meaningless if it doesn't meet your standards.
ammo performance is the only concern for anyone seriously wanting the best standards. do you rely on the chrono measured velocities or what you see at the target?

Lee

 

[Ranger188]

The OP hasn't been on since he posted the question last Monday.

 

[dgeesaman]

The OP hasn't been on since he posted the question last Monday.

The Garmin is measuring him at zero.

 

[jsdkms]

Oh yes he has!