28 nosler load development

[ColeT96]

I pumped the breaks and actually did a ladder test for OCW. I circled what I think are nodes to try now. Please critique

Also, my barrel has sped up around 80fps (shooting original load smith worked up) and since original my zero shifted has changed about 3". Will a barrel speed up cause this?

 

[lancetkenyon]

83.0/83.5/84.0 definitely look like your node. Proofed it out twice.
Start .2gr below (82.8) and test 3-shot groups for both precision and ES.
82.8, 83.1, 83.4, 83.7. 84.0

3122fps from a 22" shooting 180s is no joke.

 

[ColeT96]

83.0/83.5/84.0 definitely look like your node. Proofed it out twice.
Start .2gr below (82.8) and test 3-shot groups for both precision and ES.
82.8, 83.1, 83.4, 83.7. 84.0

3122fps from a 22" shooting 180s is no joke.

I agree. That was a please surprise

Will a barrel speed up cause a zero to shift? I had some Vld running 2920 and was zerod perfect. Now it has sped up to almost 3000 and it's off 3". Would this be a scope issue or just due to barrel change ?

 

[lancetkenyon]

I agree. That was a please surprise

Will a barrel speed up cause a zero to shift? I had some Vld running 2920 and was zerod perfect. Now it has sped up to almost 3000 and it's off 3". Would this be a scope issue or just due to barrel change ?

3" is pretty drastic for 80fps.
I would be looking at something loose in either the mounting system of scope internals first.

Re-zero, and see if it moves again.

 

[ColeT96]

3" is pretty drastic for 80fps.
I would be looking at something loose in either the mounting system of scope internals first.

Re-zero, and see if it moves again.

I figured. I'll verify mounts first. I would naturally hope it's not the scope. It's a ZCO 420.

 

[ColeT96]

3" is pretty drastic for 80fps.
I would be looking at something loose in either the mounting system of scope internals first.

Re-zero, and see if it moves again.

Well I just remembered I added a keymo brake quick attach for my suppressor that wasn't on k last time I shot. I suspect that is root cause for the poi shift.

A few times ago it took a bad beating on the ground and held strong

 

[ColeT96]

Here is an update. Not done. Why the random bullet always flying faster on the Vld h? I'm not quite done, just ran out of light

 

[ColeT96]

The Vld is .010 off and hybrid is .035 off

 

[Dmagna]

Could have also changed because you lost throat too. You will be chasing to keep this in tune, just need to get and back in and leave it alone. It's not really the cartridge that you can shoot a lot.

 

[Phil Rizzo]

I'd stick to 3 shot groups, maybe prove it with 5 when you think you have the right combo.
This isn't a paper puncher.