does this sound right 270 trajectory

WhelanLad

CGN Ultra frequent flyer
Rating - 0%
0   0   0
Location
Australia AU
Hi guys was out shooting on the range today an had a target at 100m and 200m.

I printed a group of .8 inch 3 shots. it printed (+1.5)@ 100m
I pushed out 2 shots at 200m an they printed 1cm from each other an printed (-2.4) @ 200.

Estimated Velocity is around 2850fps....

Does that sound right out of 24inch SPS M700 barrel, 130gr Corelokt projectiles.

will that give me around -15 inch at 300m? (will confirm next chance I get)

Cheers
WL
 
Last edited:
Sounds about right, but you'd only be 11-12 inches low @ 300.

With that velocity, I'd zero at 200, putting you about 2" high @ 100, and 9" low @ 300. On an average size big game animal, at 300 yds you can put the horizontal crosshair on the line of the back, and the bullet should drop right into the vitals.
 
Thanks mate, Im goin over to NZ chasing Chamois an been told ranges will be typically out there. So just trying to get the rifle tuned up. My loads are fine just getting the scope sighted right.

ive bumped it up a Click for now. at 200 that should bring it up .6 inch at that distance.
will just worry about zero-ing at 200 next chance an sending some at 300.

cheers
wl
reason for slower loads is use of varget, no chroni checks yet
 
How confident are you in the POI s at the 100 and 200m? When I calculate backwards using your POIs at those ranges I come up with 2670 fps to make it work. With those numbers the drop would be 15 at 300 meters.

A chronograph can be a rude awakening for loads. We've got a guy here that used the same load in his .270 for 20 years or so. He suspected that his drops were more than they should be but his ranges tended to be short anyway................... It still took 3 chronographs to convince him that his .270 was only going 2650 fps. He now has a new .257 Weatherby, a new (ancient to everyone else in the world, but new to him) 3150 fps load for his old .270 and a completely different outlook on life.
 
WL; Why don't you change your approach to get the best point blank possible.

To do that, I would sight that 270 +3" at 100.

This will give you a PBR of just over 300, and will not have your bullet too high at mid-range.

You also should shoot it at 200 and 300 to verify POI at those ranges.

I have so sighted all my hunting rifles for 40 years, and it has always been great, even when a long shot presents itself.

FWIW, My longest one-shot kill on a game animal was made with a 270 Winchester and the 140 Accubond @ 3005 fps MV. :)

Regards, Dave.
 
Last edited:
The ballistic Coefficient is 0.336.
"IF" sighted in at 200 yards, and velocities of 2800 - 2900, 100 yard impact should be 1.9+ and 300 yards should be 9.2 low.

NOTICE THE "IF". Five shots with a guesstimated velocity does present a statistical accuracy . . . once out of twenty times!

Dave did not make that long shot based on five shots.
 
The ballistic Coefficient is 0.336.
"IF" sighted in at 200 yards, and velocities of 2800 - 2900, 100 yard impact should be 1.9+ and 300 yards should be 9.2 low.

NOTICE THE "IF". Five shots with a guesstimated velocity does present a statistical accuracy . . . once out of twenty times!

Dave did not make that long shot based on five shots.

This is the truth, for certain!!

Many, many shots fired. many across the chronograph as well.

I knew the trajectory of that load in that rifle intimately, right out to 600 meters.

IF your velocity is close to your estimate, and you sight in +3 @ 100 Yards, the figures should look similar to this: 125Y = +3.2"; 150Y = +3.0"; 200Y = +1.5"; 250Y = -1.8"; 300Y = -6.8".

There is not substitute for practice and careful observation of your results.

Cheers, Dave.
 
Last edited:
How confident are you in the POI s at the 100 and 200m? When I calculate backwards using your POIs at those ranges I come up with 2670 fps to make it work. With those numbers the drop would be 15 at 300 meters.

A chronograph can be a rude awakening for loads. We've got a guy here that used the same load in his .270 for 20 years or so. He suspected that his drops were more than they should be but his ranges tended to be short anyway................... It still took 3 chronographs to convince him that his .270 was only going 2650 fps. He now has a new .257 Weatherby, a new (ancient to everyone else in the world, but new to him) 3150 fps load for his old .270 and a completely different outlook on life.

You have it right. Those of us who were around when Jack O'Connor was in his hay-day at Outdoor Life magazine, loaded our 270s by Jack's famous formula, 60 grains of war surplus H4831, which was faster burning than the newly manufactured H4831 by the way, behind a 130 grain bullet.
Years later when chronographs became available to regular shooters, we discovered that our 270s had been turning out 3100 fps for those years.
A 270 Winchester loaded from data in the modern loading books is running far below what a 270 should be doing and is not in the same category as one properly loaded.
Bruce
 
How confident are you in the POI s at the 100 and 200m? When I calculate backwards using your POIs at those ranges I come up with 2670 fps to make it work. With those numbers the drop would be 15 at 300 meters.

A chronograph can be a rude awakening for loads. We've got a guy here that used the same load in his .270 for 20 years or so. He suspected that his drops were more than they should be but his ranges tended to be short anyway................... It still took 3 chronographs to convince him that his .270 was only going 2650 fps. He now has a new .257 Weatherby, a new (ancient to everyone else in the world, but new to him) 3150 fps load for his old .270 and a completely different outlook on life.

Yes, chronies can be the destroyers of hopes and dreams...

What is funny is that guys forget how successful their "wimpy" loads were on game, and suddenly feel they need to upgrade. There's not always a need to throw the baby out with the bathwater...
 
Last edited:
Yes, chronies can be the destroyers of hopes and dreams...

What is funny is that guys forget how successful their "wimpy" loads were on game, and suddenly feel they need to upgrade.

To hear people talk, you'd think that typical hunting ranges could be handled with a hatchet. Might even be true, then couple that with animals that aren't very hard to kill and you can just about kill anything with anything. I still think that leaving 500 fps on the loading bench is significant, even when I know that many hunting opportunities could have been handled with black-powder.
 
Hi guys was out shooting on the range today an had a target at 100m and 200m.

I printed a group of .8 inch 3 shots. it printed (+1.5)@ 100m
I pushed out 2 shots at 200m an they printed 1cm from each other an printed (-2.4) @ 200.

Estimated Velocity is around 2850fps....

Does that sound right out of 24inch SPS M700 barrel, 130gr Corelokt projectiles.

will that give me around -15 inch at 300m? (will confirm next chance I get)

Cheers
WL

I like to play with ballistic calculators

what I do, is play with the inputs, and adjust to get a REAL idea of what to expect.
example: sierra 130gr PH .277; 2850fps, 4" MPBRzone.
now, after inputting the numbers, I play with them to get a good idea of a "Group Trajectory"

so, I expect I will be hunting with a load that can always keep inside 2moa.

that means, I add/subract from the numbers to get what I need.

if give me a max height around 150 yds, then I cannot be higher than 2.5" on the calculator, as my rifle MAY throw one UP 1.5" so I have to add that.


using that data, the 130gr PH, at 2850 gives me a MPBRzone of 244yds... So I KNOW that my true 2MOA rifle will keep EVERY bullet within a 4" zone out to 244yds EVERYTIME (if I do my part with the crosshairs.)

this is an area that I depart from the long range killers (they are not hunters) who use a rifle/load combo that is 0.50MOA.... and are shooting at WTdeer at 750 yds... assuming an 10" kill zone, add to that the 3.75" deviation, means the bullet could be as low as 8.75" below POA, giving a miss if the deer is even more than 7-8 yds farther away....
 
Howdy- I been absent for the last couple days, an this thread got off an going.

So far I havnt shot at 300m, although today is looking likely.

Im going to shoot 200 & 300 m only a few shots to get an idea of the 'drop'.

Im reloading these cartridges with the "Varget", 1 gr below max, which is around 2930fps on paper.
I done a little math an come up with an estimated speed using the 'Divided by tool. So my speeds could be off a bit...

I play with Strelok on the mobile phone an play around with speeds and POI at 100 to see if it matches up at 200-300m


Chrono would put fiction to fact I realise this. but I don't have, an with these handloads I havnt shot at 300 so its something I need to do.


I have upped the POI 1 click from previous days shooting, an may go up One more to be closer at 200m for Zero.


These are certainly slower than the 3000fps Win super X factorys
 
Varget is a little bit fast for a 270. Something in the IMR 7828 or H/IMR4831 would be better. Even IMR 4064 is a bit fast... Best velocities are 7828, and that has the lowest pressure for the velocity, although some say accuracy will be poor with that powder....
 
Tried again today.

ended up with

100m +2.0
200m -.6
300m -12 -15?(averaged) Very poor shooting Barrel quite warm, stuffed up an didn't check target after each shot. couple felt nice an couple not so, results varied.. dissapiinted in myself to be honest.

with so much heat im running out of light waiting for the barrel to cool, I threw the rifle in the truck with the aircon goin flat out, seemed to help quicker.

tomorrow arvo il punch 300 slowly


WL
 
Im confused.... an I just realised I am changing to a different primer so may have to tinker with the load before I go overseas anyway, so I can practise an shoot the same ammo OS.

Sooo.

This week il do a little bit each day, and by the end of the week hopefully il have some realistic figures. im going to try real hard for the local guy to bring out his chrono graph because as you all say.... they are almost NEEDED for this kind of stuff. would certainly make life easier right now LOL

WL
 
Varget is a little bit fast for a 270. Something in the IMR 7828 or H/IMR4831 would be better. Even IMR 4064 is a bit fast... Best velocities are 7828, and that has the lowest pressure for the velocity, although some say accuracy will be poor with that powder....
hi mate, Yep I understand its a little fast to be optimum for the .270, although im sticking with it as I use it in a few other Cals.

Im not chasing Speed, although it would be nice to know, I just feelt as though something was odd...
maybe im experiencing slightly slower than expected Velocitys....

anywho.... See how I go tomorrow :/

WL
 
they are almost NEEDED for this kind of stuff. would certainly make life easier right now LOL

It does make things a little easier and faster, but isn't 100% necessary. Given a choice between chronograph results and actual targets and measured drops I'll take the targets every time. Up until that point its all theory at least at longer ranges where everything matters. At powder burn range like 300 yards or so you can get away with shortcuts. I'm not recommending shortcuts, but what's my opinion against a few million shooters that sighted in 3" high at 100 and went home? 3, 3 and 3 works.
 
Tried again today.

ended up with

100m +2.0
200m -.6
300m -12 -15?(averaged) Very poor shooting Barrel quite warm, stuffed up an didn't check target after each shot. couple felt nice an couple not so, results varied.. dissapiinted in myself to be honest.

with so much heat im running out of light waiting for the barrel to cool, I threw the rifle in the truck with the aircon goin flat out, seemed to help quicker.

tomorrow arvo il punch 300 slowly


WL

The name of your thread is, "Does this sound like 270 trajectory(?)"
After looking at this post my answer is a definite NO. It is about like 300 Savage trajectory.
I once did considerable shooting over a bench rest at ranges from 100 to 500 yards, with a good 270 rifle. I sighted 2 1/2 to 3 inches high at 100, which was about 3 inches low at 300. With 130 grain pointed bullets my load was either 60 grains of the old war surplus H4831, which is faster burning than modern H4831, or 60 grains of Norma 205.
At 500 yards the loads with the H4831 were 34 inches low and the loads with N205 were 32 inches low.
58.5 grains of the same powders put a pointed 150 grain bullet almost to the identical groups at 500 yards as the 130s were going.
However, I will point out that my thoughts on shooting and the methods I use, are so far removed from the methods that you, and the majority of shooters on here use, that we are not on the same page, we are not even singing from the same hymn book!
Examples of what I mean. I never let the barrel cool between shots, but simply fire five shot groups one after the other, as in normal bolt action loading. I can do this and consistently make either 1 MOA five shot groups, or very close to it, because my barrels are always bedded, meaning pressure under the barrel at the front of the stock. Thus, the barrel shoots the same, hot or cold.
I completely ignore what most of you are calling "nodes," at various velocities. To find a load for a bolt action rifle I keep upping the powder until I get excess pressure signs, like a sticking bolt, then I drop back a grain or so, until excess pressure signs go away, and that is my load for that rifle.
The first time I tried 165 grain bullets in my favourite 30-06 rifle, I used this plan. I had my loading outfit beside me at the range. I loaded one round with a charge of Norma 204, then increased the next one a grain, until after five rounds, when there was some sign of excess powder and the last round had 4 grains more powder than the first.
I fired each shot at a target at 100 yards. When I retrieved the target I found that my five 165 grain bullets, with the lowest loaded four grains less the heaviest, were all in a group that was half a bullet diameter over one inch!
Damn, I guess that stupid rifle of mine doesn't know a thing about those speed nodes you guys all talk about.
 
Some realistic figures from todays afternoon shoot.

100m +2
200 0 -.5 if any
300m -10-12 average.

target100.jpg~original


200
target200.jpg~original



300

IMG_0392target300.jpg~original



Anybody interested in slamming some numbers through a ballistic calculator thing and seeing for a rough Velocity?

I'm happy enough with this set up an plan on stalking in as close as I can get, rather than shoot 350m.

cheers!

WL

BTW- I had to swap primers from the other loads, side by side not much difference, no scope adjustments but a PB group @ 100.
 
All this wandering down memory lane got the better of me, so I had to break down and get another .270 Win today. You'd think that I had it covered with a .270 WSM and a .270 Weatherby but apparently not. Besides I'm a sucker for a pretty handle.
 
Back
Top Bottom