GunnyGene
Hawkeye
Haven't shot this "sniper rifle" in a couple years, so I reckon I'll burn some Hornady 45grn .22mag later to see if I'm still a decent shot. 
Nice day today. Time for RPR practice
- Thread starter GunnyGene
- Start date
contender
Ruger Guru
Why not?
Sounds like a good day for sure!
Sounds like a good day for sure!
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OP
GunnyGene
Hawkeye
Had to diddle with the scope a bit to get sighted in (torso target). 1" grid squares for reference.
contender
Ruger Guru
Looks just fine to me!
RDMR.......Rodent Designated Marksman Rifle.......
OP
GunnyGene
Hawkeye
I'll be redoing this with the CCI 40grn Gamepoint ammo - probably this coming weekend. Running the factory numbers, JBM calculates far better ballistics for the CCI than the 45gr Hornady.
CCI
Hornady:
Attachments
RugerForMe
Blackhawk
I have a friend that has one of these, he buys the cheapest ammo he can find then complains about accuracy. 
OP
GunnyGene
Hawkeye
Sounds like he could benefit from some coaching.I have a friend that has one of these, he buys the cheapest ammo he can find then complains about accuracy.
"he buys the cheapest ammo he can find then complains about accuracy"
I've found many cases in which the price of the ammo had little effect on the accuracy if/when the right combination of gun and ammo was found.
Plus as noted above, the shooter may well be the limiting factor.
I've found many cases in which the price of the ammo had little effect on the accuracy if/when the right combination of gun and ammo was found.
Plus as noted above, the shooter may well be the limiting factor.
OP
GunnyGene
Hawkeye
The problem with inexpensive .22 is that it's inherently not going to be as accurate or consistent as centerfire boat tail rifle rounds especially at longer ranges, due to the low BC and MV. When it hits the sonic barrier all bets are off. A standard .22 (lr or wmr) has a BC in the .110 range. The CCI 40grn Game Point has a BC of .133 due to it having a slightly pointier nose than the standard 40grn fmj or the Hornady 45grn. This seemingly minor difference in BC results in a significantly flatter trajectory/greater effective range as shown in the comparison above. Both of those cartridges are similarly priced, but with significant differences in performance.
Bullet weight, and resulting differences in MV of course, also plays a role in this. A 30grn V-Max steps out at around 2200fps, but a BC of .095(not good), and it's also more subject to being pushed around by crosswinds than a heavier bullet.
I suspect that the friend mentioned has not been made aware of the ballistic realities of ammo, or doesn't care.
Your mention of the lasser BC & lighter weight of the 30 grain will get pushed around more by the wind makes plenty of sense at first look. But then I re-read & picked up on the vel. numbers. saw the 30 is 2200 fps. That vel. increase over the other 2 might might more than make up for it's lesser B.C. numbers.
Then noticed you don't have a crosswind number in your input data. May I suggest you enter a value there, say 10 MPH @90 deg. ? Higher BC's usually win in wind drift over lesser, but BC & velocity is a balancing act. At some point different combos will meet. I started to chart all 3 myself, but just too lazy this morning.
The results are sometimes surprising, especially at close ranges. Hi BC bullets start shining their best at longer ranges.
Then noticed you don't have a crosswind number in your input data. May I suggest you enter a value there, say 10 MPH @90 deg. ? Higher BC's usually win in wind drift over lesser, but BC & velocity is a balancing act. At some point different combos will meet. I started to chart all 3 myself, but just too lazy this morning.
The results are sometimes surprising, especially at close ranges. Hi BC bullets start shining their best at longer ranges.
OP
GunnyGene
Hawkeye
I've done the math on atmospheric influences with other centerfire rifles and ammo years ago. Just didn't bother with it for this. You're right, it is all a balancing act and making compromises to get the result you want for a specific combination of rifle system, ammo, and shooter. Not always easy to do, particularly if the target is breathing.
Modern tech has overcome a lot of what used to be brain strain. Built in targeting tech in high end scopes for example, that read the wind, target distance and movement, etc. and automatically displays a solution in the reticle.
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GunnyGene
Hawkeye
We're way past chrono's and hand held range finders. The USMC, among others, are buying the SMASH 3000L, initially for anti-drone capability, but it's capabilities make it useful for other purposes also. Ammo BC, and MV out of that specific rifle are pre-programmed, so the system includes that in the targeting algorithm. All the shooter has to do is push a button to lock on to the target, pull the trigger and keep following the target until the system fires the gun at the exact instant for that perfect shot.
https://www.smart-shooter.com/
Tracking Point is another rifle mounted similar system.
https://jfeusa.com/tracking-point/
Elite marksmen using today’s most accurate rifles, optics, rangefinders, and ammunition can group shots within 4 inches of their aim point at .57 miles. With a TrackingPoint firearm, your shots will strike within 0.5 inches of your aim point at .57 miles. Therefore, a quality firearm equipped with TrackingPoint’s optics and trigger technology provides hunters and long-range shooters with the tools they need to be as accurate as a natural-born, hard-earned elite marksman. With a TrackingPoint system, hunters unable to dedicate the time and resources required to achieve such an elite level of skill can now make dreams of a trophy kill a reality.
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GunnyGene
Hawkeye
That's always been the case with weapons tech for all of human history. The guy who invented the atlatl lost out to the guy who improved it by adding a piece of animal gut to a curved stick for better lethality at longer ranges - which we call a bow. It's a never ending competitive race in both the defense and civilian industries to have better stuff than the other guy.
Don't think for second that nuclear ICBM's are the 'ultimate' weapon. The jury is still out about that.
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RugerForMe
Blackhawk
He is 63 and is beyond help at this point. He's the guy that buys a $1200 rifle and slaps a $25 Tasco on it.
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GunnyGene
Hawkeye
I guess different folks age differently. I'm 81, and always open for helpful advice.
