Long range tuning

[Nature Boy]

We’ll see how things play out. The NF comp is certainly top tier glass and I’ve been a good boy this year.

I would say I see more NF Competition scopes on the F Class line than any other brand

 

[JFrank]

I had some reservations about this scope due to some problems in the past however I’ve not heard the same scuttlebutt regarding poi shift on these newer zero stop models, and the glass is world glass.

 

[Nature Boy]

There were a lot of Scope Checker threads running on ASF for a while. Haven’t seen any recently.

 

[JFrank]

There were a lot of Scope Checker threads running on ASF for a while. Haven’t seen any recently.

My buddy (Jet) is a big advocate of scope checking but he himself is returning to Nightforce comp series. My Deep Creek family seems to have started mist of the scope checking so if I had a question or incident I have a resource plus they are lifetime warrantied

 

[JFrank]

Earlier in this thread I was trying to understand why my sighters were impacting a different location than my record rounds, I suggested that I may have a mental error of some type of disconnect. I don’t always take a chronograph to the range rather let the target tell me when it’s in tune. What I’ve discovered is that while brass number one shoots as small as brass number two they do not share the same capacity or fps leading to point of impact shift.
Brass batch number two averages 40 fps faster.

The lesson here is to test your brass by feet per second.

 

[Varminterror]

So Jim, the gremlin in the back of my head REALLY wants to know if brass #1 has a different internal capacity from the others - is that the smoking gun for the fps change?

 

[JFrank]

So Jim, the gremlin in the back of my head REALLY wants to know if brass #1 has a different internal capacity from the others - is that the smoking gun for the fps change?

Dude brass one shoots from 2911-2940 ish and brass 2 shoots at 2936-2976 that’s quite a bit
(Just off the top of my head not going out to the shed now) so it has to be different case capacity in my mind.

 

[JFrank]

Here’s a sample of brass number two

 

[JFrank]

Brass number one

 

[Nature Boy]

I’ve never see variation like that

 

[JFrank]

It’s been right in front of me all along, posts 168-176 sh and might explain why this group shot with brass number one hit so low when I knew I was center bull on sighters. Any way I’ve made a point to really spend more time with a chronograph. Hopefully I’ll get this stuff figured out one day.

 

[JFrank]

I have 200 new cases neck turned and ready for fire forming.
More to follow…

 

[JFrank]

Wednesday looks good …

 

[Nature Boy]

Not for me

 

[JFrank]

Well it ended up being jusssst a tad colder than expected and quite frankly we went into a sit around the wood stove mode through the holiday’s but now the new year is upon us so it’s time to get out and form some brass.

 

[JFrank]

My backordered scope arrived today, leaving Indiana on the 22nd it went to Puerto Rico for a few days then headed north to Montana.
All I could do was laugh it off and be happy it’s here in one piece.
ya just can’t make this stuff up…

 

[JFrank]

Looks pretty good, I’ll set the eye relief and cross hair to a plumb line at the range.

A mention towards my range mate Tom , he earned shooter of the year, he outworked the competition and earned this highly regarded honor.. they’ll be no living with him now….
https://forum.accurateshooter.com/threads/ibs-1000-yd-shooter-of-the-year.4082285/

https://internationalbenchrest.com/posts/2021-1000-yard-soy-point-standings
On a side note- 6 of the top 23 shooters in the country are my range mates, no wonder winning at Deep Creek is so hard.

 

[Varminterror]

Glad that NF found its way home. I always wonder how in the world some packages get routed to far corners - I had a package ride a boat for a week to Guam on its way from California to Kansas. Once it made landfall, it jumped a plane to Honolulu and another back to Denver, before a couple of brown trucks carried it down the mountain to my door… but, it made it…

 

[Nature Boy]

That’s a nice looking rig Jim!

 

[taliv]

Dude brass one shoots from 2911-2940 ish and brass 2 shoots at 2936-2976 that’s quite a bit
(Just off the top of my head not going out to the shed now) so it has to be different case capacity in my mind.

my money is on neck tension

 

[JFrank]

my money is on neck tension

I’m certainly open to all opinions and options, moving forward I’ll set a goal to keep better data. I think I posted earlier some groups after some bushing adjustments using two sets of brass.
Both of these below are the same load but different brass and shot on different days..@ 500 yards, unfortunately I don’t recall any chrono data but I did feel these were shooting pretty decent

 

[Walkalong]

my money is on neck tension

Agreed.

Even when using a bushing style expander for match rounds, especially if using non neck turned cases, I want my bushing to size a hair more than needed, just enough so that my expander does a tiny bit of expansion on every case.

 

[taliv]

Anecdotally this is my bullet selection in shooter for 6.5x47L



Same load but second and following loadings on a given case are faster than the first firing.

 

[JFrank]

Your 16 fps doesn’t seem that unreasonable although I would expect the opposite considering once the case is formed the capacity is slightly increased.
Are these the same lot number brass?
How does the new brass to old brass neck tension compare ?

 

[JFrank]

Agreed.

Even when using a bushing style expander for match rounds, especially if using non neck turned cases, I want my bushing to size a hair more than needed, just enough so that my expander does a tiny bit of expansion on every case.

I appreciate y’all weighing in, all my cases are turned as close to.0108 as I can get and my loaded rounds are .265 plus a couple 10/000 at the pressure ring, I use a .262 bushing.