quick question 308 trajectory

WhelanLad

WhelanLad

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hey guys had a bit of a downer day with the T3 today, I figured out it dislikes a dirty barrel! sprayed the bullets around 3 inch or so, Anywho I cleaned the barrel and then shot a 3 shot 1inch group incl the fouler.. So its all ready to be packed away for a Week long hunt in the Wonnangatta valley in south east Austraya.


My question is the POI is approx an no more than 1 inch high at 100m using 150gr Corelokt factories!

My .270 is shooting for a 200m zero which I use out to 300m, quite often shots are from 2-300 where I use that rifle. (farm fringe)

This 308 is a Walk about hunting rifle for Sambar deer and the smaller Fallow deer, I assume my shots will be mostly under the 200m mark with the occaisional longer shot if glassing / across gulley in big country. (I am not confident over 300m unless its the .270 as I've done a lot of practise at that range).

Im just tripping out at the moment as I don't normally sight in 1inch at 100m but that's how I was given the rifle and with this trip so close I would rather leave it be, I did previously click up the scope 1 but it was at the same time the bullets were spraying and it was only today I proved it was a dirty barrel.. I thought as I touched the adjustment that the scope wacked out (burris fullfield 2) as its taken a fall but only damage is the turret caps not the turrets themselves... previous owner had no problems with holding zero or re sighting etc.

Anywayy..

with these 150gr doing app 2800fps sighted in 1 inch high at 100m, Roughly how much drop do I have a 200m and 300m?

Thanks kindly fellas!

WL
 
been there shows short an long trajectory but nothing with a specific 1inch at 100..

not a member of the rem country so cant dl the ballistics program....

Someone will have the answer roughly

WL
 
Just to back up Whelanlad's numbers, I ran it on Winchester 150gr power points, and got the exact same numbers.

Have fun on your hunt!!
 
kodiakjack said:
Just to back up Whelanlad's numbers, I ran it on Winchester 150gr power points, and got the exact same numbers.

Have fun on your hunt!!
Click to expand...

Awesome! Thanks!

Will do, il throw up some photos on return!

WL

note: hunting thick bush gulleys so the trajectory will work fine I believe!
 
You shot the gun... how hard is it to click up to 2.5" @ 100 at the same time? Generally, you will maximize MPBR on a 4" kill zone radius when you are approximately 2.5" high at 100 yards. Might as well take advantage of the cartridge... bring a couple extra boxes and maybe you can get in some more work on location.
 
issue I had was I clicked up but then it jumped 3 inch high or so.... (ended up being dirty barrel flyers)
Not 100% sure myself if the scope is tracking great or not an don't wana blow a box to find out ... after this trip il have as much time as id like to re zero the rifle and possibly fit the Redfield on it.

I just don't wana guess or waste money as that money wasted can go into food for the 8 days bush :)



Not sure if the Burris are click or slide adjust so for now ima jus leave that thang!
We are also in a National Park, so the rules say we arnt allowed to shoot/plink whilst in Park , but can discharge rifle at the Deer.. Not even allowed to shoot Wild dogs in the Park.... uh ok :S
WL
 
An inch high at 100 is too low. Best to sight in 3 to 4" high at 100. You'll be on target out about 300 with no hold over.
Remington's Ballistics page is for their ammo, but it's close enough. With a 100 yard zero(standard for most ranges here), a 150 will be 1.2" high at 150, 3.9" high at 200 and 8.4" at 250. Then it'll plummet.
 
Where i hunt most shots are under 17 yards, but ocasionally you will find yourself in a field and have a 2-300 yard shot. If i recall correctly i have my .308 2-1/4" high at 100, and anything up to 250 i don't even think about, and hold a couple inches high if it's 300, beyond that i'm not confident enough to try. Winchester has a nice ballistics calculator on their website where you can pick zero distances and compare different bullet weights. I usually use it to get a rough idea before i go out, but it's gotten me pretty close so far.
 
WhelanLad said:
issue I had was I clicked up but then it jumped 3 inch high or so.... (ended up being dirty barrel flyers)
Not 100% sure myself if the scope is tracking great or not an don't wana blow a box to find out ... after this trip il have as much time as id like to re zero the rifle and possibly fit the Redfield on it.

I just don't wana guess or waste money as that money wasted can go into food for the 8 days bush :)



Not sure if the Burris are click or slide adjust so for now ima jus leave that thang!
We are also in a National Park, so the rules say we arnt allowed to shoot/plink whilst in Park , but can discharge rifle at the Deer.. Not even allowed to shoot Wild dogs in the Park.... uh ok :S
WL
Click to expand...

Seems to me that you are not confident in your set-up and are not certain of POI or how the gun shoots... you are about to shoot at game animals... if I was in your shoes... I would not be shooting at game until I was certain of my rifle... even if it meant "wasting" five boxes of shells (don't see how that is wasting though)... how much is the trip costing? And the purpose is to harvest game? And the one thing that will achieve that goal is shaky at best... it's up to you but I would sort it out asap...
 
hoytcanon said:
Seems to me that you are not confident in your set-up and are not certain of POI or how the gun shoots... you are about to shoot at game animals... if I was in your shoes... I would not be shooting at game until I was certain of my rifle... even if it meant "wasting" five boxes of shells (don't see how that is wasting though)... how much is the trip costing? And the purpose is to harvest game? And the one thing that will achieve that goal is shaky at best... it's up to you but I would sort it out asap...
Click to expand...

Nah all good Hoyt cannon, Im confident it will hit a Beast out to 150 no problems at all.. Being the thick bush I doubt the shot will be over 150!
If I was carrying this rifle out on a local property then I could expect a critter at 300m , and as You say, that's something I would not do with this Rifle setup at the moment.


Trip doesn't cost too much, just fuel an food etc.. Its about a 4 hour trip middle of the bush from my Town. the closest town is 2.5hour drive out.


curiousity got the Better of me today, Ive been given the day off work as things are quite.... So!!

I put the scope 2 clicks UP and will be "wasteing" 3 shots this evening to "make sure" of the POI and then I'l be happy days.

that should give me around a 1.3-1.5 inch HIGH at 100M POI

I will post a photo of todays Events in here later on

Cheers for the info guys, will sus out the Winchester site for their ballistic calc!
in regards to the 3 inch high story, I cannot justify being 3 inches high at 100m id generally shoot over !


Be in touch

WL
 
Well, a Photo of the Target after 'wasteing' the 3 shots LOL

ps- im not too worried about blowin 308 cases downrange!!! could be worse hence the 35 whelen!

The low shot caught me slightly by surprise an did let off on the lower end of the target. the rest were reasonably spot on. slightly heavy trigger , being a left possibly poking them out to the right a bit. horizontally im not worried, vertically I am interested.

#### tape but gives an idea. im sure its no more than 2 and no less than 1.5 LOL That's how its stayin.. seems to be around a 180m zero, approx. 1in low at 200 and 10 for 300...

IMG_0943Tikka.jpg~original

IMG_0956target308poi.jpg~original

in order of shots. top #1, bottom #2, middle #3- middle felt the best at let off. groups tad over 1 inch for an average midday 3 cracker shoot.
Cheers!

WL
 
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IMHO you have to actually shoot the ranges to have an idea of what is happening. Not all barrels provide the same velocity and not all published muzzle velocities are accurate and not all published (or more correctly very few) BC are accurate. Add all of those things together and you can be WAY off in the real world. For example, my friend's old T3 in .300 WM. With certain loads the 200gr Partitions were, according to the book, to be moving along at +2900 fps. Over an Oehler 35 we saw they were only going mid to high 2700fps. The difference in some cases was 200 fps. Same with IMR 7828 in one of my 7mm RM and 175gr Partitions. Book velocity is 2950fps, BC is .519. Real velocity was 2750fps and real BC is about .450
 
yeh totally, but don't take this the wrong way, im not goin out to deliberately shoot a beast at 357m or 431m an use a ballistic program to put the bullet in the vitals.

im merely hunting thick scrub shots under 200 98% of the time.
wasn't happy with the inch high goin into the trip. made adjustments and just partially trying to learn some trajectorys for these 308s, certainly aint a lazer beam past 250m by the looks...

Hardest thing is all the American ballistic cals are all in Yards... gets a bit of a handful reading 400yards and say X drop, to find out that 400y is merely 350ms etc etc.

Yes I agree. real world range shooting is the word on the street for consistant 'longer' range shooting.

Totally understand what you are saying 1899

WL
 
just to touch on that, In early stages of the 270 reloading, I was looking at factory numbers for out to 300m.... that was all good an well , until I loaded my loads an they were pushing 2800fps an not the 3100 factory .... was a fairly noticeably difference at the 300m target but somrthing I practised an have taken Red an Sambar deer at 290 and 310 respectively. 1 shots.


il be grabbing the Remington 700 .270 for the longer stuff, which is very capable in closer... but for walking the hills all day, the t3 308 gets the nod

WL
 
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