Range report.

K

kilotanker22

New member
Here is a range update on my TC Venture 270 WSM. Pretty sure I am gonna keep this load for this rifle.

This is the Nosler 140 grain ballistic tip, with 67.5 Grains of Magpro. Seated .030 off the lands at a COAL of 2.744. CCI 250 LRM primers.

The first target is 200 yards 5 round group. the third round I pulled and ruined the group. So I measured the group without that shot. so 4 shot group was 1.311" , so .626 MOA.

Second photo is 300 yards. 5 shots. 2.025" or .644 MOA.

I am impressed with this rifle. I have a 3-9 power Nikon on top so nothing special.

At the moment I do not have a chronograph so I am gonna try to figure velocity by the elevation difference from 200-300 yards. (The range I was at today only goes to 300. At 200 yards The center of my group is approximately 2.75" high. At 300 yards the center of my group is 2.5 inches low. That is without adjusting the elevation on the optic. Now I have got to figure out what velocity numbers would make that bullets trajectory... I will compare it to a new chronograph in a couple weeks.

Anyone care to make a guess at the velocity?
 

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Yeh, I just used a standard height in the ballistic calculator... what is your height?

That's a lot of powder, my manual has no listing for mag pro but none of the listed powders are anywhere near that amount of powder
 
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That load is toward the bottom of the load data for Western powders who make it. And right in the middle of the load data for Nosler.
 
I'm interested in how you calculated the MOA. If the group diameter was 1.311, you subtract the bullet diameter, .277 and the group is 1.034.

With 5 shots measuring 2.025, subtract .277 = 1.748.

Your calcs were a group of 1.311 = .626, yet a group 154% larger, 2.025 gives a MOA only103% larger, .644

?????

As well, your photo show a circle drawn a great distance away from the outside diameter of the group. The circle drawn should be just at the outside of the two or three bullets holes that are furthest apart. That is the group size, then subtract the bullet caliber diameter.

For example, draw 2 one-inch circles touching each other. Each circle represents a bullet diameter of one inch. When they touch each other the overall diameter of that "group" is 2 inches. If you measure the distance from the center of one to the center of the other, it will bea MOA of one inch. You get the same result by subtracting the bullet diameter (one inch) from the group diameter (2 inches).

The goal of MOA shooting is to have both bullets exactly covering each other so the center-to center distance is zero. If the overall group measurement of my example is 1.5 inches, that group is 0.5 MOA.
 
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The measurements I gave were after subtracting bullet diameter.

To convert that to MOA. At 200 yards. You divide the group size in inches by the number of inches in 1 MOA at that distance. I believe that 1 MOA is 1.047 at 100 yards so 200 yards 1 MOA is 2.094. Divide 1.311 by 2.094 to get .626 MOA.

The 300 yard group measuring 2.025 inches after subtracting bullet diameter. Use the same process as before. 1.047 inches is 1 MOA at 100 yards so multiply that by 3 for 300 yards. Which equals 3.141. so divide the group size in inches by the size of 1 MOA in inches at 300 yards. 2.025 divided by 3.141 equals .644 MOA.
 
But aren't you just considering a 100 yard group as the basis for calculating the 200 and 300 yard groups? It almost sounds like the recommendation that 1" high at 100 yards will be 2" at 200 and 3" at 300 yards.

I don't know, I've never heard of it being measured as you describe. I'd be interested in what others have to say.
 
How else would you measure it?

1 MOA is not the same number of inches at 300 yards and 100 yards. 1 MOA is 1.047 inches at 100 yards. 2.094 inches at 200 yards. 3.141 inches at 300 yards etc. The increase in the number of inches in 1 MOA is linear across distance.

These targets were shot at those distances.
 
Group size in inches divided by the number of inches in 1MOA at that distance eqals the group MOA.

At 100 yards that is 1.047 inches. So most people just call it 1 inch. So 1 inch at 100. As the distance increases the number of inches in 1 MOA also increases.
 
The only thing changed from factory settings is the trigger. I kept the factory trigger, but adjusted the Take up, over travel and clipped 1.5 coils off of the spring. Then ground the spring end flat again.

Trigger breaks at 2.5 pounds. Clean, no take up. And try as I might. I can not get the sear to fall without pulling the trigger.

The Stock trigger in the TC Venture is actually quite serviceable.
 
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