Range report.

Wait till I get home. Still tinkering with this load to see how far up this accuracy nodes goes. Worked up to 68.5 grains Magpro with the 140 grain BT. Shoots really well. 5 shot group well under 1 inch at 100i think. Even though my cold bore shot was slightly out of the group. Should have been thinking and fired a couple fouling shots since I cleaned it the other day.

I will post photos later from my computer
 
140 grain BT 68.5 Grains Magpro

Measured outside to outside. Then subtracted bullet diameter and divided by 1.047. Wound up measuring .78 MOA. The shot that was out of the group a little was the first shot. And the group started walking back toward zero. This is at 100 yards.

The reason for today's range trip was to see if I could get a little more velocity from this bullet and powder while staying inside the accuracy node. For a Deer rifle I am happy with it.

Coal was 2.757 Putting me around .020 from the lands.
Nosler 140 grain BT.
CCI 250 LRM
68.5 grains of AA Magpro
I will also Chronograph this load when I get my new Chrono. I figure I will settle on a load in the mean time.

I only loaded 5 rounds with this charge weight, because I had other powder and bullet combos to try. I loaded up to 69.5 grains of Magpro, but the groups started opening up. Could be me, could be the weather. It was 18 degrees this morning with about a 10 MPH cross wind. Maybe 3/4 value.

I intend to try this same load with the Sierra 140 grain HPBT Game king. Gonna load some of them up tonight. They are shorter though, COAL with the 140 grain Sierra HPBT Game King is 2.683. That leaves me just .010 from the lands. And the boat tail below the shoulder Datum. This will be a compressed load with this bullet. The reason for the change to the Sierra is the fact that they are less than half of the price of the Nosler. And if they shoot as well then I will continue to load the sierra.

I also loaded some of the Sierra 140 grain Game Changers for this and shot them today. I will post a photo of that group later. They did not shoot as well. ALthough with that bullet I am limited to Magazine length and I am .070 from the lands.
 

Attachments

  • 68.5 grain magpro 140 grain BT.jpg
    68.5 grain magpro 140 grain BT.jpg
    93.4 KB · Views: 11
140 grain game changer

I wasn't very impressed with the 5 round group of these that I shot. Mag length is .070 off of the lands. So I decided to turn it into a 20 round group and shoot up the rest of the game changers that I had loaded. All 20 of these shots were fired giving about a 30 second break between shots. The barrel heated up and started to scatter them around pretty good. LOL Still minute of deer though!!
 

Attachments

  • 140 grain gamechanger. 67.5 grains magpro 20 round group.jpg
    140 grain gamechanger. 67.5 grains magpro 20 round group.jpg
    129.5 KB · Views: 9
Here is an odd one. This was the Sierra Game Changer 140 grain with 68 grains of H-1000. The first three shots were low, so I adjusted my elevation. This was after shooting the other groups. I have never seen such a POI change at 100 yards using a different charge.. Needless to say, I don't think H-1000 is the powder for this rifle. At least not with 140 grain bullets. with Magpro I was more than 2 inches higher POI.
 

Attachments

  • game changer with H-1000.jpg
    game changer with H-1000.jpg
    116.8 KB · Views: 9
Jsnake711 said:
With that sight height, I'm still getting 3275fps
Click to expand...
I have spent the time to get a more accurate measurement of scope height. Then using Actual Bullet trajectory at 100, 200 and 300 yards. Along with Bullet specs. 3100 FPS is the value that basically fits the bill to within 1/4 inch at 300 yards on the trajectory. I am gonna set my guess for bullet velocity at 3100. Then get actual readings with my new chronograph in a couple weeks.
 
you know I don't think I have ever changed the scope height when using the JBM calculator I just leave it set the default. I can chrono a round at 100 then run it out to 800 and be within a half MOA just using the programs data. I suppose if I were a precision rifle competitor I would need to be more concerned. Those guys don't get sighters

On the scope dope there is only 1.6 inches of difference at 300 yds going from 2600 FPS to 3000 FPS. Do a come up of 4.25 inches (1 and 1/4 or 1.5 MOA) and shoot for the middle and your group center should be golden on the vertical, or at least within a half MOA if you do your part
 
Hounddawg,

The photos are on the first page at the bottom. I posted several times in a few minutes so I wanted to make sure y'all knew they were already posted.
 
Those are nice groups for a hunting barrel, you can really see where it heated up

better be careful or you will get bit by the long range bug and that's a deep rabbit hole
 
Also I forgot to mention.

The velocity estimation based on bullet trajectory and actual atmospheric conditions at the time of the groups. Was not with the New load I tested today.

It was with the load tested when I first posted this thread. They were tested today as well as last week.

I used the trajectory that I observed last week to compare to today. Making sure that the reaults were comparable. The trajectory that I observed today, was just about Identical to what I observed last week.

The "Trajectory Test" groups were each fired after the barrel had some fouling shots in them. And given just enough time for cooling for the barrel to be close to room temperature between the three groups. Here are the details for the load and conditions.

270 wsm, 22 inch barrel
Nosler 140 grain BT .277 Caliber. G1 BC .456
67.5 Grains of Magpro
cci 250 LRM primer.
COAL 2.757. (.020) from the lands.

Scope height= 1.785 (Rounded to 1.8" for the calculator"
Zero= 200 yards
Zero height= 2.5"
Height at 100 yards= 2.6
height at 300 yards= -2.5

I used the actual Atmospherics for my location at the time the groups were shot.
21 degrees F
Elevation 800 Feet
pressure 30.09"
Humidity 43%
 
Plugging this same info in for a 300 yards zero put me at 3 inches high for 100 yards. So I sighted them 3 inches high at 100. Then fired another group at 100 and a group at 300 to confirm. Again plugging that velocity in with my load. The calculator was right on.

I will post the 100 yards group when I get home. Forgot to bring my 300 yard target off of the range, but all 5 shots landed into about a 2.5 inch group.

Also ran this test with the Sierra Game changer as well as the Sierra 140 grain HPBT Game king. The Game changer had same point of impact as the Nosler BT. The HPBT Gameking was 3 inches lower at 300 yards than the other two bullets. I assume this is because it's not a very streamlined bullet, and the BC is considerably lower.
 
First image is 5 round at 100 to confirm zero height with the Nosler BT and 67.5 grains of Magpro load. Not sure if that one shot was me or coincidence.... Would have been a mighty fine group...

Second photo is the 140 grain HPBT Game King. 68.5 grains of Magpro. As I suspected, I had pressure signs. I will back these off by 1 grain, back to the start of this node. I feel like they will shoot better at 67.5 grains of Magpro. Also by the time I had shot this group I was getting very cold from being on the range. So maaybe I had something to do with the groups windage opening up.
 

Attachments

  • IMG_26012019_160124_(750_x_750_pixel).jpg
    IMG_26012019_160124_(750_x_750_pixel).jpg
    231 KB · Views: 9
  • IMG_26012019_160911_(750_x_750_pixel).jpg
    IMG_26012019_160911_(750_x_750_pixel).jpg
    205.3 KB · Views: 8
I got my Magnetospeed chronograph today so I will be takign both my 6.5 creedmoor and this 270 wsm out to confirm velocity and adjust sight the optic for the velocity I get. then shoot a 300 yard group.
 
So I have a ton of data that I collected today. It will take several posts through the day.. I will begin with the most interesting data of the day.

270 wsm. TC Venture.
Winchester case, CCI 250 primer, COAL 2.737
130 grain Sierra game king
72 grains H-1000
Avg- 3305 fps
Hi- 3325
Low- 3289
SD- 18

71.5 grains H-1000
Avg- 3305
Hi- 3324
Low- 3281
Sd- 16

These numbers near Hodgdons starting data are 140 FPS faster than their listed max charge. I already know that 71, 71.5 and 72 grains of H1000 and that bullet shoot pretty well. Also these were the highest velocities of any of the loads I tested today. Should be an excellent load for deer hunting.
 
That load with Magpro that's shoots really well was slower than I figured.

140 grain Sierra
67.5 grains Magpro.
Avg-2987
Hi-3017
Low-2968
Sd-18

I think with a different 140 grain bullet (that isn't seated so far into the case) and a little more powder I can get the velocity up a bit.

However. I may end up sticking with a 130 grain. And H 1000. Trying to tweak that load. Velocity was stellar. I was surprised to see 3300 FPS with a starting charge in a 22 inch barrel.

If I find a higher BC 130 grain bullet that's shoots good at that velocity. I will have a great mid to long range deer cartridge.

Although the slower 140 grain load will be great as well.
 
You must log in or register to reply here.
Back
Top