I tried some 130 grain Nosler Accubonds in my 270 and sighted it dead on at 100 yards and expected a bit of a drop at 200 but it was 2 1/2 inches high. 60 grains of H4831 and no indication of high pressure. Is it the bullet or am I over pressure and velocity is too high? No chrono.
Shooting 2 1/2 " high at 200 yards
- Thread starter Varmit
- Start date
Im not sure why then, but your bullet is still climbing between 100 and 200 yards, and the only reason a bullet will ever climb is if the barrel is pointing up.
If the barrel was perfectly level the bullet would only drop due to gravity.
I plugged some numbers in my balistic calculator too, for a 130 gr berger bullet going 3000 fps zeroed at 100 yards, with a scope hight of 1.5. it says @ 200 drop: -2.92
If the barrel was perfectly level the bullet would only drop due to gravity.
I plugged some numbers in my balistic calculator too, for a 130 gr berger bullet going 3000 fps zeroed at 100 yards, with a scope hight of 1.5. it says @ 200 drop: -2.92
Jack O'Conner
http://en.wikipedia.org/wiki/Jack_O'Connor_(American_writer)
Varmit, I grew up reading anything I could get my hands written by Jack O'Conner and his .270 rifles, He sighted in his .270 to shoot 2 1/2 inches high at 100 yards and he could aim dead on out to over 300 yards.
Most reloading manuals have a trajectory charts for their bullets at given velocities and what your are seeing has to do with the line of sight and the line of the bore, meaning the height of your scope above the bore.
The way your rifle is sighted in now by the Nosler manual at 3000 fps 100 yards 0.0, 200 yards "minus" -3.1 inches so it may be your scope mounts and the height above the bore.
I would shoot it at 300 yards and see how low it shoots, my .270 with 130 grain bullets would be approximately seven inches low, and I was using high see through mounts.
http://en.wikipedia.org/wiki/Jack_O'Connor_(American_writer)
Varmit, I grew up reading anything I could get my hands written by Jack O'Conner and his .270 rifles, He sighted in his .270 to shoot 2 1/2 inches high at 100 yards and he could aim dead on out to over 300 yards.
Most reloading manuals have a trajectory charts for their bullets at given velocities and what your are seeing has to do with the line of sight and the line of the bore, meaning the height of your scope above the bore.
The way your rifle is sighted in now by the Nosler manual at 3000 fps 100 yards 0.0, 200 yards "minus" -3.1 inches so it may be your scope mounts and the height above the bore.
I would shoot it at 300 yards and see how low it shoots, my .270 with 130 grain bullets would be approximately seven inches low, and I was using high see through mounts.
yes, I've heard of Jack O, and have quite a few of his books and know how he sighted his 270. I have Talley (medium I believe) lightweights on a featherweight M70 and I just measured it and the bell of the objective lens is about 1/4 inch above the barrel and I would say the center of the scope is 1.5 inches above the center of the bore, so it's not mounted very high.
I shot N BTips the same day at 100 yards and 300 yards. 100 yards 0.0, and 300 yards, -7.0 inches. I didn't shoot the BTs at 200.
So, do you guys think a scope at that height would give figures like this? It's just that I was expecting 2 or 3 inches low and thought maybe I had too hot of a load.
I shot N BTips the same day at 100 yards and 300 yards. 100 yards 0.0, and 300 yards, -7.0 inches. I didn't shoot the BTs at 200.
So, do you guys think a scope at that height would give figures like this? It's just that I was expecting 2 or 3 inches low and thought maybe I had too hot of a load.
Ok, I will, so you're thinking I'll see them a little higher with a cold barrel. Maybe so.
Varmit
In the end it doesn't matter what the charts and graphs show, and all that counts is what "YOUR" rifle is doing and how accurate it is at 100, 200, 300 yards. Your rifle is shooting very similar to the .270 I had and if it was my rifle I would raise the 100 yard POI to raise the 300 yard POI and call it quits as long as your groups are acceptable at the longer ranges.
The Nosler manual shows 59 grains of H-4831 as a max, BUT this varies with each rifle and load, case capacity etc and as long as you don't have over .001 base expansion of your cases your good to go.
In the end it doesn't matter what the charts and graphs show, and all that counts is what "YOUR" rifle is doing and how accurate it is at 100, 200, 300 yards. Your rifle is shooting very similar to the .270 I had and if it was my rifle I would raise the 100 yard POI to raise the 300 yard POI and call it quits as long as your groups are acceptable at the longer ranges.
The Nosler manual shows 59 grains of H-4831 as a max, BUT this varies with each rifle and load, case capacity etc and as long as you don't have over .001 base expansion of your cases your good to go.
nowarningshot
CGN Ultra frequent flyer
I would, without knowing you or your sighting in procedure have to agree with Dogleg. When a barrel heats usually you get vertical stringing. I believe you said it is a Model 70 lightweight, which means a pencil barrel. Given that the laws of physics are not at fault, something in the setup is.
What i would do is check the torques on the mounts, and shoot really slow groups with a cold barrel. I am always happy and excited to be at the range, so i take a 22 along and shoot my hyperness out with that. Aimed center fire shot, mag or two of 22 lr, another careful center fire shot....at least 1 minute and better yet 5 minutes between center fire shots. As a shooter, where else would i rather be than at the range. If i dont have the time to shoot in this way, i dont go at all. YMMV
What i would do is check the torques on the mounts, and shoot really slow groups with a cold barrel. I am always happy and excited to be at the range, so i take a 22 along and shoot my hyperness out with that. Aimed center fire shot, mag or two of 22 lr, another careful center fire shot....at least 1 minute and better yet 5 minutes between center fire shots. As a shooter, where else would i rather be than at the range. If i dont have the time to shoot in this way, i dont go at all. YMMV
There is no way a bullet can rise 2 1/2 inches at 200 yards if it is "dead on" at 100. Physics. No hot powder charge, or "barrel whip" can change the effects of gravity. That means that there is some other weird rifle/scope thing going on, or you just shoot very badly. Lets rule out bad shooting for now. It is conceivable that as your gun heats up, there are forces changing the point of impact to produce the effects you see, but any bullet that is high at 200 yards would have to be higher still at 100 - not "dead on". My guess is that a scope issue may well be part of the problem. It is unlikely to get that much difference in trajectory from barrel heat.
Follow the advice already given. Check ALL the screws you can see. Shoot all your test shots from a dead cold barrel, and see what that does to the results.
Your post with the ballistic tips seems to be perfectly normal performance. I have no real solution to the issues you saw with the Accubonds, and I do not know what your procedure at the range is like, so everything is a guess. I would also suggest you develop a process that you use at the range for sighting a rifle and do it exactly the same way every time. You need to eliminate variables in order to understand what is producing any effects you see.
Follow the advice already given. Check ALL the screws you can see. Shoot all your test shots from a dead cold barrel, and see what that does to the results.
Your post with the ballistic tips seems to be perfectly normal performance. I have no real solution to the issues you saw with the Accubonds, and I do not know what your procedure at the range is like, so everything is a guess. I would also suggest you develop a process that you use at the range for sighting a rifle and do it exactly the same way every time. You need to eliminate variables in order to understand what is producing any effects you see.
It can't be, the Star Gate is in Vancouver. (after you thieving Canadians moved it from Cheyenne Mountain Colorado)
You could try rubbing ###### on the barrel but if the barrel stays stiff for over four hours you have to call a gunsmith.
It can't be, the Star Gate is in Vancouver. (after you thieving Canadians moved it from Cheyenne Mountain Colorado)
we didn't steal anything.............you guys moved it here so you could stretch your dollar................
back to the main topic..........try it on another calm day, 3 cold barrel shots at 100 and then 3 cold barrel shots at 200, wait ten minutes or so between shots to let the barrel cool, you may have caught some weird wind the day you thought gravity died
