Node with Copper Bullets?

[seidersjoden]

I wouldn't accept a load that shot great at .006" and bad at .011. Are you talking most people shooting this projectile or just in general?




I recommend listening to the Modern Day Sniper Podcast episode 14. That really opened my eyes about seating depth and made me reexamine my whole load development process. Other than that, dude, you are shooting good groups with a single digit SD. How far down the rabbit hole you gonna go chasing a couple of FPS better SD across your loads? How many people on this forum are shooting SD in the 1,2,3? How far you have to shoot for 4 or 5 FPS to cause a miss? Also- how many rounds is going to take you to shoot a group at every .002" increment between .002" and .025"?

All good points. You do have to weigh the wear and tear, I've never been one to continue to over-test a load, I'm not the type that enjoys driving back and forth to the range a bunch and testing loads, once I get something acceptable I quit testing. With 105.5g of RL33 and 300g OTMs, I achieved a SD of 3.0 in a five shot group before hunting season this year and I was done testing and very happy about being done. Being stationed in Colorado currently, the shooting range is much more convenient than San Diego, so before I head back I want to finalize a Copper bullet load here. I appreciate all the help

 

[coyotezapper]

All good points. You do have to weigh the wear and tear, I've never been one to continue to over-test a load, I'm not the type that enjoys driving back and forth to the range a bunch and testing loads, once I get something acceptable I quit testing. With 105.5g of RL33 and 300g OTMs, I achieved a SD of 3.0 in a five shot group before hunting season this year and I was done testing and very happy about being done. Being stationed in Colorado currently, the shooting range is much more convenient than San Diego, so before I head back I want to finalize a Copper bullet load here. I appreciate all the help

Start here and then read on. There is a lot of data here on jump.

Bullet Jump: Is Less Always Better?

About 2 years ago, Mark Gordon shared some preliminary research he’d conducted with the Applied Bal...

precisionrifleblog.com

 

[OrionsStar]

I don't like to stand on a soap box but this is not fake news.
Hammers are great! Terminal performance is off the chart.

 

[seidersjoden]

Start here and then read on. There is a lot of data here on jump.

Bullet Jump: Is Less Always Better?

About 2 years ago, Mark Gordon shared some preliminary research he’d conducted with the Applied Bal...

precisionrifleblog.com

I've read that, I am a subscriber to Kyle's articles. My rifle is made by Mark at Short Action Customs. Over the life of the throat and chasing the lands, that theory makes sense. Again, I'm not scared to jump that's not what this is about, I'm just trying to find a node with copper bullets but I'm trying to cross all my T's and dot all my I's and work my way out, just collecting first-hand experience with these copper bullets which is great feedback here, thanks fellas.

 

[seidersjoden]

Possible problems is neck tension, wrong powder charge, primer or even wrong powder. Can you list all of your load details?

bullet and weight
powder and charge, fps
bbl length
oal
primer
method of sizing brass

Every detail you can think of will help, CE bullets are used in ELR comps so they have to be somewhat easy to tune.

Forgot to fill in all of your questions, I size brass with custom Whidden dies, my overall length to ogive is 2.8890" with these particular Bullets, as best predicted using the Hornady OAL gauge, which isn't perfect, and I'm jumping off of that.

 

[coyotezapper]

Forgot to fill in all of your questions, I size brass with custom Whidden dies, my overall length to ogive is 2.8880 with these particular Bullets, as best predicted using the Hornady OAL gauge, which isn't perfect, and I'm jumping off of that.

If I was you I would stay with same powder charge and work with seating depth. Everything looks real close .

 

[DBoone]

Start here and then read on. There is a lot of data here on jump.

Good read. Thanks for the info.

 

[coyotezapper]

Forgot to fill in all of your questions, I size brass with custom Whidden dies, my overall length to ogive is 2.8890" with these particular Bullets, as best predicted using the Hornady OAL gauge, which isn't perfect, and I'm jumping off of that.

If the bottom group is .011" jump I would bet that .013-017" will be a accuracy node.

 

[seidersjoden]

Just returned from the range, I tested the jumps of .002", .004", and .006" off the lands. It looks like the advice that I have gotten on here is correct, CoyoteZapper, you called it, the closer I get to the lands the less accurate it seems to be getting:

2.8880

3059, 3094, 3079, 3058, max 3094, Min 3058, AVG 3072, SD 17.2

2.8860

3079, 3063, 3058, 3056. Max 3079, MIN 3056, AVG 3064, SD 10.3

2.8840

3044, 3064, 3057, 3058 max 3064 MIN 3044 AVG 3055 SD8.4

Going to go back out to .011" off of the lands as I did for my last trip to the range and increase the jump by every .005" until I find a node.

 

[coyotezapper]

Just returned from the range, I tested the jumps of .002", .004", and .006" off the lands. It looks like the advice that I have gotten on here is correct, CoyoteZapper, you called it, the closer I get to the lands the less accurate it seems to be getting:

2.8880

3059, 3094, 3079, 3058, max 3094, Min 3058, AVG 3072, SD 17.2

2.8860

3079, 3063, 3058, 3056. Max 3079, MIN 3056, AVG 3064, SD 10.3

2.8840

3044, 3064, 3057, 3058 max 3064 MIN 3044 AVG 3055 SD8.4

Going to go back out to .011" off of the lands as I did for my last trip to the range and increase the jump by every .005" until I find a node.

Are you shooting free recoil? If you put your off hand on the forearm behind your rest it may eliminate the vertical in the .006" group. It may be hopping a bit but looks promising.

 

[seidersjoden]

Are you shooting free recoil? If you put your off hand on the forearm behind your rest it may eliminate the vertical in the .006" group. It may be hopping a bit but looks promising.

My left hand is squeezing the bag, shooting off an Atlas bipod. I have a real nice steady rest. In the seated position off of a table, in an indoor hundred yard range. I feel confident that it's not my execution as with lead bullets I don't seem to have this issue. Only picture that I have of the gun. XLR chassis, lone peak arms titanium action, Short Action Customs did the barrel, 7 x 35 night force. Here's a picture of a group with SDs in the threes shooting 300 OTMs.

 

[seidersjoden]

the bottom group is .011" jump I would bet that .013-017" will be a accuracy node.

Agreed. I'll probably start with .013" and then work back every 4-5 thousandth from there.

 

[coyotezapper]

Agreed. I'll probably start with .013" and then work back every 4-5 thousandth from there.

Keep us updated.

 

[Troutslayer2]

You should at least load some with some big jumps and see what happens It might surprise you.