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Midas + 22LR BC ??

R.Morehouse

R.Morehouse

Gold $$ Contributor
My local club is doing a 22lr match that will be shooting out to maybe 300yds. I wanted to take my gun over and find the drops before the match. Could someone please give me the BC of the 40g round nose so I can get an aprox. to feed into my calculator..............Thank You

Regards
Rick
 
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R.Morehouse said:
My local club is doing a 22lr match that will be shooting 22lr out to maybe 300yds. I wanted to take my gun over and find the drops before the match. Could someone please give me the BC of the 40g round nose so I can get an aprox. to feed into my calculator..............Thank You

Regards
Rick
Click to expand...
This might be a starting point…

www.lapua.com

.22 LR ammo | Rimfire Cartridges | Lapua Midas+

Always accurate, Lapua Midas+ is the .22 caliber ammunition of choice for many world class rimfire shooters in various sport shooting disciplines.
www.lapua.com www.lapua.com
 
Everyone I shoot with struggles with
solid numbers when it gets long with the
22. I've tried the Kestral, Shooter, and Applied ballistics. Download the A.B. app and plug in a G7 of .062 give or take a point. I know it doesn't make sense to use a G7 . 1107 fps is what works for me.. Velocity will be the question as will temperatures. Different lots run at different speeds. Applied Ballistics is solid for me out to a bit over 400 yards.
 
Stupid question, but did you check then bullet library in whatever calculator you are using?

I’ve seen the more popular 22’s in a couple. I know JBM has them.
 
dellet said:
Stupid question, but did you check then bullet library in whatever calculator you are using?

I’ve seen the more popular 22’s in a couple. I know JBM has them.
Click to expand...
I use ATRAG in an HP IPAQ......No library, but the system has served me well.......But Thanks for the input....:cool:
 
When the supersonic bullet moves downrange and falls into the subsonic velocities it experiences a turbulence which degrades accuracy. Same with centerfire rounds just at much greater distances. A bullet that never exceeds the speed of sound does not experience this and is therefore more accurate within its nominal effective range.

I know this as I stayed at a Holliday Inn.
 
1Merlin said:
When the supersonic bullet moves downrange and falls into the subsonic velocities it experiences a turbulence which degrades accuracy. Same with centerfire rounds just at much greater distances. A bullet that never exceeds the speed of sound does not experience this and is therefore more accurate within its nominal effective range.

I know this as I stayed at a Holliday Inn.
Click to expand...
I fully believe this and normally use subsonic match ammo but when I tried high-velocity match I saw little to no difference, It's not like high-velocity falls out of the air or turns sideways.
 
These darn 22s are fickle past about 250 yards. One day to the next is a new adventure even if you think you have all your settings locked in. I use strelok pro and RA4 drag function. I have never once seen anything that will capture the trajectory with one constant BC. I shoot my drops and pay very close attention to wind direction and speed, elevation, temperature. Once that data is collected I literally use a multi point BC based on velocity drops until I get things fudged in to match my actual drops from shooting.

Keep in mind rimfires are not immune to temps either. You will need between .5-1fps per degree.

I shoot to 300ish at matches every few weeks and every time its a new experience. Two weeks ago I watched the shooters before me and adjusted based on their impacts or trace. Had I not adjusted I would have been .3 Mil high which would probably still made the plate but not by much.

I'd be very interested in seeing your vertical at 300. I shot CtrX for one season and at distance it was better but not by a large enough margin for me to pay the difference over SK std plus or pistol match special.
If you run a tuner I would also be interested in your vertical improvement at distance.

Pay very close attention to your velocity and make sure your zero is spot on prior to starting your long game. Being off even a little on a 50 yard zero has pretty significant change at distance.
 
1Merlin said:
When the supersonic bullet moves downrange and falls into the subsonic velocities it experiences a turbulence which degrades accuracy. Same with centerfire rounds just at much greater distances. A bullet that never exceeds the speed of sound does not experience this and is therefore more accurate within its nominal effective range.

I know this as I stayed at a Holliday Inn.
Click to expand...

Transonic turbulence doesn't affect .22LR ammo, unless, perhaps it has a very high MV.

The source of confusion seems to be how transonic turbulence affects .22LR bullets. The problem of accuracy-robbing transonic turbulence, where an increase in pitch and yaw occurs, happens when a projectile slows down from supersonic velocity into the transonic zone. The transonic zone is roughly 1340 - 890 fps.

See Robert McCoy's unsurpassed ballistic study of .22LR ammo, especially conclusion point #5 on page 11 in "AERODYANMIC CHARACTERISTICS OF CALIBER .22 LONG RIFLE MATCH AMMUNITION" https://apps.dtic.mil/dtic/tr/fulltext/u2/a229713.pdf

Most high velocity .22LR ammo is too slow to be affected by transonic turbulence. Except for .22LR ammo that has an MV greater than 1340 fps, all other .22LR ammo, HV and SV, spends its flight time within or below transonic velocities.

HV ammo is usually made for hunting and plinking at a low cost and highest accuracy is not a requirement. As a result, HV ammo typically isn't as accurate as match ammo.
 
I read and don't agree. I feel my stay at the Holliday Inn enables me to make a superior conclusion.
 
The paper seems to agree that supersonic/transonic ammo still really does have MORE wind sensitivity than subsonic.
So even if there is technically no accuracy difference in still air there may be a practical difference at 200.

We have 1 or 2 200 yard shoots a year and there are always people who think bringing high velocity will give an advantage in trajectory and wind bucking. Even after reading the paper(thanks) I still see zero advantage and some disadvantage.

eta - I'm coming from the prone/f-class perspective where there is plenty of time to zero perfectly.
multiple imperfectly known distances may swing things back to the trajectory 'advantage' of high velocity
 
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Faster .22LR ammo is indeed more sensitive to wind than slower .22LR ammo, but that has nothing to do with transonic turbulence.

The problem with high velocity .22LR ammo is, as always, the lack of quality and consistency. There is no such thing as high velocity .22LR match ammo that comes even close to the high end of the transonic zone velocities.
 
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