284 Shehane fine tuning

[JamesnTN]

For the past two mornings at day light I've been out at the range fine tuning the 284 Shehane beginning with seating depth and today neck tension.

Today I tested same loads with neck tension by using bushings .307, .306, and .305 the load is 57.5 grains of H4831sc and a F210m primer.

The target below represents each bushing, via color marked on the target by the bullets.
The bare holes the bushing used is a .307 and showed verticle. The red holes are with the .306 bushing and the blue is the .305 bushing. As you see as the bushing got tighter the group did as well.

I stumbled along with maybe a slower velocity the other day so in the morning I'm going to back my load back down and see if it's still there. I'm hoping to find the best of both worlds accuracy and velocity but if I have to choose between the two the accuracy is going to win every time.


Here's the target shot at 500 yards

Here's the rifle and setup.

Here's the range I shoot at. Berms are 100,200,300 and 500 yards

Here's the long range side, berms are 100, 600, 750, 1000, and 1250 yards you can't see the 100 yard berm in the pics, but it's mandatory to shoot 100 first then 600 to get your zero on the rifle. Some 6000 yards back is a state park so that's why its mandatory. Also at 600,1000 and 1250 yards we have a wireless camera setup to see the shots.

 

[Terry]

James

If you would circle each hole with the corresponding color
they would be easier to see.

Thanks!

Terry

 

[JamesnTN]

James

If you would circle each hole with the corresponding color
they would be easier to see.

Thanks!

Terry

Since I'm at work I'll do my best to describe each hole in relation to color

Bare: top right square middle of right square, bottom right in solid blue circle , bottom left of square and at outer 3 o'clock x ring

Red: x, 7 o'clock in 10 ring then there are three diagonal in solid blue practically inlign to each other.

Blue: ten, eleven and six o'clock on x ring eight o'clock ten ring and bottom right of the square

 

[Keith Glasscock]

How far did you have that target set?

 

[JamesnTN]

How far did you have that target set?

I'm sorry it's at 500 yards

 

[1shot]

Could you also supply us with the neck wall thickness and the clearance of the chamber to a loaded round.
Thanks,
Lloyd

 

[JamesnTN]

Could you also supply us with the neck wall thickness and the clearance of the chamber to a loaded round.
Thanks,
Lloyd

Chamber neck is .313 loaded round is .309 necks are .0125

 

[Scott Harris]

Wow, what a shooting setup.....I'm jealous. You should put some flag poles up too! Don't burn that barrel out doing load development James.

 

[JamesnTN]

Wow, what a shooting setup.....I'm jealous. Don't burn that barrel out doing load development James!

Thanks Scott,

Currently it has 110 rounds thru it, I'm not sure what's the life span on them may be someone can chime in. I think one more outing with some loads backed off to the other node I found will do for me on all I can squeeze from the rifle.

 

[Scott Harris]

1500-2000 rounds depending on the barrel and how picky you are.

 

[JamesnTN]

1500-2000 rounds depending on the barrel and how picky you are.

That's good to know, it finally quit copper fouling as well.

 

[ShootDots]

1500-2000 rounds depending on the barrel and how picky you are.

That's good to know, it finally quit copper fouling as well.

James, there will come a time where it will start "coppering up" again.. That's when you will know you have the onset of some firecracking..

 

[ericskennard]

Your vertical string indicates that the bullets need to be seated longer. Try them at + .010, +.020, +.030.

What bullets are you using??

 

[JamesnTN]

Your vertical string indicates that the bullets need to be seated longer. Try them at + .010, +.020, +.030.

What bullets are you using??

They were .015 off in this test and I made a slight change to seating depth and now they are .011 off the lands .01-.024 is where it likes to shoot.

Vertical is a sign of not enoughowder or too light neck tension.

The bullets used are the Berger 180 Hybrids