50s 52s 53s 55s vs wind

[Jeff Porter]

Thanks Jeff that’s heaps easier for me to
Understand when you put it like that! I’m running a khales helia 2 4-12 x56 on a pic rail, not sure if I could get it closer I’d have to look at the options. Do you shoot coyote to sell the hides? Does it matter where your entry hole is if you do? Or do hide shooters have to head shot on coyotes. I think 4 “ in the right size for an average it can only be an issue if you have a really big one looking front on if your a bit low it will not penetrate through the nose/jaw properly to get to the brain so you have a smaller target unless they turn thier head

I use the 6mm 58 Vmax and body shoot the coyotes. With that bullet at 243 velocities I do not have exits so only a small 6mm hole to sew up.

if you have the height of your current rig crosshairs above the bore and the velocity of your bullet of choice or a real close estimate of what it is we can run the calculator a couple of ways to see if we can get a decent point blank range for a smaller target.

 

[NETim]

Last time I saw a 'roo was about 40 years ago. The little guy was on a leash being led around by cute little Sheila in a berthing compartment aboard the DD972 while in Adelaide harbor.

I don't think either one was supposed to be there. LOL

 

[AckleymanII]

Ozshot, if you can obtain the 55g Speer tnt you will have MUCH better ballistics than with the Speer 52g TNT. Speer also makes a 52g match bt that is fantastic to say the least in accuracy.

 

[alf]

Roos are everywhere, 10 miles from me.....

Eight years later, Iowa County kangaroo still a mystery - The Dodgeville Chronicle

thedodgevillechronicle.com

 

[Ozshot]

Depends on how much clearance between the objective lens and the barrel you currently have as to how much you can lower the scope. If you have high rings you might be able to go to a medium height ring however that depends on the rifle stock because if it has a high comb that might limit how low you can go.
If the setup shoulders nicely and you have a good cheek weld sometimes it's better not to mess with something that's already working good.
If you know any good shot gunners they might be able to help with gun mount tuning.

A trick we use is to focus on an imaginary target, close eyes, mount rifle, open eyes and cross hairs need be close to bang on the imaginary target. This simple test is excellent for offhand shooting whereas I imagine most of your LR Roo headshots are taken with a rest.

I’ll get you a photo of the setup I’ve got to shoot from so you can see

 

[Ozshot]

Ozshot, if you can obtain the 55g Speer tnt you will have MUCH better ballistics than with the Speer 52g TNT. Speer also makes a 52g match bt that is fantastic to say the least in accuracy.

Thanks ackleyman11 I can’t source anything but the 52’s in the 1000 packs, all you guys are hogging them over there before they can get sent down under haha

 

[Ozshot]

I use the 6mm 58 Vmax and body shoot the coyotes. With that bullet at 243 velocities I do not have exits so only a small 6mm hole to sew up.

if you have the height of your current rig crosshairs above the bore and the velocity of your bullet of choice or a real close estimate of what it is we can run the calculator a couple of ways to see if we can get a decent point blank range for a smaller target.

Thanks Jeff I’ll get back to you with a measurement in a couple of days, that would be fantastic to see what you come up with with all the specs

 

[AzMandella]

Although I am a newby to reloading and have not tried them yet I was told the .224 60grn V-Max are very accurate and would think the extra weight would help more in the wind .

 

[Ozshot]

Depends on how much clearance between the objective lens and the barrel you currently have as to how much you can lower the scope. If you have high rings you might be able to go to a medium height ring however that depends on the rifle stock because if it has a high comb that might limit how low you can go.
If the setup shoulders nicely and you have a good cheek weld sometimes it's better not to mess with something that's already working good.
If you know any good shot gunners they might be able to help with gun mount tuning.

A trick we use is to focus on an imaginary target, close eyes, mount rifle, open eyes and cross hairs need be close to bang on the imaginary target. This simple test is excellent for offhand shooting whereas I imagine most of your LR Roo headshots are taken with a rest.

 

[Brians356]

Lindsay - yes. The concept of a point blank zero is just that. You hold middle of fur from the muzzle to the calculated distance and do not hold over. You have to know the height of your sights above the bore and the diameter of your target in addition to the muzzle velocity and BC of the bullet. The theory is you set the zero such that the flight path of the bullet does not rise above 1/2 the diameter of your target or fall below 1/2 the diameter until your point blank range. In my case chasing coyotes, I use a 5” diameter for the kill zone. I set the radius in JBM to 2.5” and ask it to zero at point blank zero. With my 243 shooting 58Vmax at 3700 FPS I will zero at 270 yards and hold middle of fur out to 313 yards. It is about 2” high at 200 yards but it is still a double lung shot if aiming right.

I've been a fan of PBR since reading the old NRA publication "Sighting In" which I wish they still printed. PBR is especially useful on big game. The larger the target radius the better, and trophy hunting raises heart rate enough to reward a "hold in the hair" approach. If you strive to close range to within PBR, say 300 yds for most cartridges big game, it is a good system. If the range is a bit farther, hold on the top of the hair and let fly.
-

 

[Brians356]

Ozshot, if you can obtain the 55g Speer tnt you will have MUCH better ballistics than with the Speer 52g TNT. Speer also makes a 52g match bt that is fantastic to say the least in accuracy.

Last I checked the only .224 TNTs are 50 and 55. The conventional HP and Match HP are 52s.

PS Speer also sells a 33-gr .224 TNT I guess for plinking. It looks more like a pistol bullet.
-

 

[Homerange]

Pics from an Aussies Roo shooting rig are clearly false.....there's no mud over there ! LOL

Tell me Ozshot, are you taking those 200+yd headshots with the engine still running ?

 

[Jeff Porter]

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www.midwayusa.com

52 gr HP “trash cans” On sale at Midway. But I don’t know that they ship to OZ.

 

[Ozshot]

Pics from an Aussies Roo shooting rig are clearly false.....there's no mud over there ! LOL

Tell me Ozshot, are you taking those 200+yd headshots with the engine still running ?

Yeah I leave it running all night, you need to be able to reposition the truck as they are on the move to get the most shots in while they are still stopping and starting within range.
I’ll take any advantage I can get

 

[Homerange]

Yeah I leave it running all night, you need to be able to reposition the truck as they are on the move to get the most shots in while they are still stopping and starting within range.
I’ll take any advantage I can get

Oh, a diesel or petrol truck ?
Hell I even have trouble using the quad bike for a rest if it's still running.

 

[Ozshot]

I use the 6mm 58 Vmax and body shoot the coyotes. With that bullet at 243 velocities I do not have exits so only a small 6mm hole to sew up.

if you have the height of your current rig crosshairs above the bore and the velocity of your bullet of choice or a real close estimate of what it is we can run the calculator a couple of ways to see if we can get a decent point blank range for a smaller target.

Will I have to chronograph for velocity? Or can you use BC? The BC is 0.168 and the height is 50mm or 1.97inches from center bore from what I can see, if I have to chronograph I’ll have to wait until I load an AI round as I’m still fireforming at the moment for another 200 cases or so. I only just bought a chronograph since I came on here and saw I really had no idea about the intricacies of reloading and load development!

 

[Ozshot]

Oh, a diesel or petrol truck ?
Hell I even have trouble using the quad bike for a rest if it's still running.

Diesel so it’s not too bad, I guess it’s like anything you get used to and better at it the more you do it, and I’m using that rest all night 3-4nights a week year round so I should be able to hit something off it by now!! I have definitely noticed that if something is off the slightest bit to what your used too it will affect your accuracy, down to if the foam on the rest has compacted too much and needs replacement or if the seat back setting is slightly higher or lower. I’m suprised you can get about in NZ on a quad bike the hills are damn near vertical over there!! haha it’s beautiful though we went there on our honeymoon. Must take some skill to work out your distances in that kind of steep terrain while Hunting though,
Although I’m sure there is plenty of not steep county too

 

[Homerange]

Ozshot, quad work is reserved mainly for getting around the tracks not so much the most direct overland route as any hillier country is well tracked for getting around mustering and the like. My spotlighting is mainly for rabbits for the cat and keeping on top of your darn nocturnal Aussie possums our greatest pest species around Auckland where we are. Mainly 22 work and now both are in good numbers again, rabbits in particular, the 10/22 has been dragged out rather than the more accurate bolt action Anschutz.
Never had the chance to shoot Roo's although we did get a few foxes when visiting friends in WA.

What's your typical nightly Roo tally ?

 

[Jeff Porter]

Will I have to chronograph for velocity? Or can you use BC? The BC is 0.168 and the height is 50mm or 1.97inches from center bore from what I can see, if I have to chronograph I’ll have to wait until I load an AI round as I’m still fireforming at the moment for another 200 cases or so. I only just bought a chronograph since I came on here and saw I really had no idea about the intricacies of reloading and load development!

Are too shooting factory ammo or loading the 223 to fire form? If loading what powder charge are you using ? We can make some guesses and you can verify with a couple of shots at distance.

 

[Ozshot]

Are too shooting factory ammo or loading the 223 to fire form? If loading what powder charge are you using ? We can make some guesses and you can verify with a couple of shots at distance.

I’m using 27.4gns of ADI 8208 and federal 205 primers in once fired Winchester/military mixed brass to fireform. I’ve got a Caldwell chronograph to start using are they good enough to do what I need?