Long range load development at 100 yards.

[savageshooter86]

I would say you found your max

 

[TZaun]

Yup. Pretty confident that 32.7 is over max.

 

[Steve Blair]

Yup. Pretty confident that 32.7 is over max.

[br]
What primer are you using?

 

[TZaun]

CCI 450.

 

[Steve Blair]

Great primer. Takes a lot to pierce one.

 

[TZaun]

Yes they are. My eye tells me that 31.8 is the one to go with but I was hoping to get any other input. For some reason I keep looking at the 30.5 area also. I used this method a week ago with my 264 Win Mag and had great success. That one showed the vertical patterns real nice and easy and those 120 Sierras tightened right up at around .030 to .036 so I settled with .033. They shot great at 600 and a 1000 last weekend when I was out playing around.

 

[savageshooter86]

My opinion 31.3 looks to be a good area too?

 

[Erik Cortina]

I would do a seating depth test 31.3 gr.

 

[TZaun]

Hate to be a pest, but I must not have a handle on how you are supposed to look at the groups. I put a red dot where I consider the center of the the three shots. I thought that might help you see how I am picturing this. Isn't 31.0 and 31.3 where the groups start to rise and then plane out at 31.5, 31.8, and 32.1 be fore starting to rise again at 32.4? I'm glad I decided to ask for help as I am not doing this correctly.

 

[Erik Cortina]

Try both loads, 31.3 and 31.8, the target will answer all doubts!

 

[TZaun]

I have no doubts that you are correct. What I'm troubled by is that I thought I had a handle on how to do this correctly after reading all the posts. What am I seeing incorrectly? If you don't mind, can you explain what's wrong with my guess and why you reached your conclusion?

 

[Erik Cortina]

I have no doubts that you are correct. What I'm troubled by is that I thought I had a handle on how to do this correctly after reading all the posts. What am I seeing incorrectly? If you don't mind, can you explain what's wrong with my guess and why you reached your conclusion?

The problem is the groups are not clearly defined, so they both might work. I just took a guess as good as yours. The deciding factor would be the chronograph, but since you didn't use one, we are still guessing.

 

[TZaun]

I see. Thanks for your time. Do you trust the plain old Chronys to give good enough data for this? I know earlier you mentioned you favor the Oehler. Sometimes I really wonder about the consistency of the Chronys. I have recently put the LED hood on mine and early indications are that is making a significant difference as there aren't any more "errors" and the velocity swings have really tightened.

 

[Erik Cortina]

I see. Thanks for your time. Do you trust the plain old Chronys to give good enough data for this? I know earlier you mentioned you favor the Oehler. Sometimes I really wonder about the consistency of the Chronys. I have recently put the LED hood on mine and early indications are that is making a significant difference as there aren't any more "errors" and the velocity swings have really tightened.

I have used some others before, and when they worked they were ok, they were usually off on speed, but they served the purpose of identifying consistent loads. The Oehler and the PVM-21 are the two that I would really trust to give accurate speed readings.

 

[jsthntn247]

What you think, shot this today with a .243 and berger 95 hunting hybrids seated .020 off lands. Top left group is 39.6 of imr 4350 bottom left is 42.0, shot in .4gr increments.

 

[Erik Cortina]

I would say between the first two groups is the best place to test.

 

[jsthntn247]

Initially thought that myself but the more I look at it I think between 5 & 6 looks best. Not really liking the alternating 2 on 1 off of the first 2. How far off the lands do the hunting hybrids like to be?

 

[Erik Cortina]

Initially thought that myself but the more I look at it I think between 5 & 6 looks best. Not really liking the alternating 2 on 1 off of the first 2. How far off the lands do the hunting hybrids like to be?

"Yeah, you're probably right"

 

[broncman]

I would say between the first two groups is the best place to test.

Listen to Erik......

One and two have nearly no vertical and can most likely be tuned by seating depth...

 

[jsthntn247]

I would say between the first two groups is the best place to test.

Listen to Erik......

One and two have nearly no vertical and can most likely be tuned by seating depth...

Will do, this is a huntin gun so I'll start at .o20 and work backwards to around .060 off and see what happens.