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Old January 17, 2019, 05:01 PM   #1
kilotanker22
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Range report.

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?
Attached Images
File Type: jpg 200 yards.jpg (62.3 KB, 63 views)
File Type: jpg 300 yard.jpg (58.6 KB, 58 views)

Last edited by kilotanker22; January 17, 2019 at 05:12 PM. Reason: Change Title
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Old January 19, 2019, 03:56 PM   #2
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Depending on your scope height, I'm getting 3295fps.
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Old January 19, 2019, 04:00 PM   #3
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Sight height 1.5"
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Old January 19, 2019, 04:20 PM   #4
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sight height is center bore-line to center of scope right? I will attempt to measure that
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Old January 19, 2019, 04:22 PM   #5
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3295 would be really cooking for that bullet. I will know for sure in a couple weeks
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Old January 19, 2019, 04:23 PM   #6
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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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Old January 19, 2019, 04:48 PM   #7
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1.795"
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Old January 19, 2019, 04:50 PM   #8
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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.
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Old January 19, 2019, 06:18 PM   #9
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I think the Muzzle Velocity is more in the tune of 3050 FPS.
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Old January 19, 2019, 08:22 PM   #10
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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.

Last edited by cdoc42; January 19, 2019 at 08:35 PM.
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Old January 19, 2019, 08:32 PM   #11
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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.
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Old January 19, 2019, 08:41 PM   #12
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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.
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Old January 19, 2019, 08:49 PM   #13
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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.
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Old January 19, 2019, 08:53 PM   #14
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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.
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Old January 19, 2019, 09:30 PM   #15
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Nice groups Kilo, varmint barrel ?
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Old January 19, 2019, 09:48 PM   #16
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Sporter barrel.

This is a factory TC Venture. 270 wsm
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Old January 19, 2019, 09:56 PM   #17
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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.

Last edited by kilotanker22; January 19, 2019 at 09:57 PM. Reason: Spelling
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Old January 20, 2019, 06:31 PM   #18
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With that sight height, I'm still getting 3275fps
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Old January 20, 2019, 09:08 PM   #19
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Is that measurement at the objective lens?

I've never had a scope be a flat 1.5", or 1.6", etc..
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Old January 20, 2019, 10:54 PM   #20
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The measuerement for scope height was center bore line to center of the tube of the scope.
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Old January 25, 2019, 10:13 AM   #21
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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
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Old January 25, 2019, 01:45 PM   #22
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Quote:
I will post photos later from my computer
looking forward to seeing them. I wish more people posted targets here
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Old January 25, 2019, 02:47 PM   #23
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Strelok specifies at the oblective lens for your scope height.
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Old January 25, 2019, 03:00 PM   #24
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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.
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File Type: jpg 68.5 grain magpro 140 grain BT.jpg (93.4 KB, 10 views)
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Old January 25, 2019, 03:20 PM   #25
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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!!
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