Long range load development at 100 yards.

[ch21]

I don't think my bullets like the 20 jump(groups really open up), but I guess that is not the point of the first round of this method. I pretty sure I pulled that high round in 59.5.

 

[SHootSTraight22]

Just what shootstraigh22 said , I would look into 29.1 to 30 in one tenth increments

Thanks everyone for your input. I'm still learning how to identify pressure signs. When I mentioned "ever so slight pressure signs" at 29.2 I noticed that the bolt was just "ever so slightly" harder to lift than at lower powder loads. I did not check for ejector marks. Since this is new to me - I figured I would stop there (29.2) to be safe.

I can shoot 29.1 and 29.2 (again) and check for ejector marks (I just googled images of that). If it looks ok - I'll try one round at 29.3 and check for heavier bolt lift and ejector marks on the brass. I can repeat for 29.4 if everything checks out at 29.3. I can see how the grouping goes - but given my lack of experience, I am hesitant to go all the up 30gr even in .1 increments (unless one of my more experienced friends comes along to double check everything).

You'll be okay... When people say harder bolt lift they mean they noticed it "without trying to notice it.." I have a feeling you purposely was lifting up your handle slowly, feeling for heavier lift.. Look, shoot a higher loads until you start seeing ejector marks that are shiny.. You'll start showing light ejector imprints before that stage occurs so you will know when to stop.. It want sneak up on you I promise.. What caliber and brass/powder are you shooting???

 

[SHootSTraight22]

I don't think my bullets like the 20 jump(groups really open up), but I guess that is not the point of the first round of this method. I pretty sure I pulled that high round in 59.5.

Where do you see pressure at sir??? We need to know how high you can go because your rifle may just be finding its tune... It helps to know what we are looking at so we know what the barrel/rifle/shooter/caliber/powder can do... I mean lets say your shooting an Ultra Mag here, well the first thing I would ask is why don't you increase your powder charge weight.. Just give a little information most importantly rifle, caliber, and powder.. Thats all... It will help people help you instead of moving on...

 

[ch21]

Pressure signs at 61.5-61.3. 6.5 SAUM, Norma brass, h1000, 24 inch brl.

 

[weejohn]

Hi folks , hope you don't mind me joining in.

No velocity figures as I run a magnetospeed and didn't want any chance of that effecting groups.

284 Winchester with 162 amax H4831SC @ 100yds . 58gr "just" started showing pressure with 1 primer very slightly cratered. Also the bullet hole top left on 54.5gr was a fouler round.

I was thinking 57.5gr and playing from there .

 

[Marksman63]

Strange behaviour! Charge grows while POI goes down?

 

[weejohn]

I also wondered that , I also done some load development with my 6x47lapua at the same time and the
POI did rise with increased powder charge.

Both new barrels with only 10 round through them.

 

[Marksman63]

Seating depth test
308 215 Hybrid at 2705 fps
3 shots

I would get the 0.020" one

 

[Hollywood]

Seating depth test
308 215 Hybrid at 2705 fps
3 shots

I would get the 0.020" one

Did you adjust for poi? That seems to be alot of vertical change for rl the same charge weight and different seating depths.

 

[Marksman63]

Sorry I forgot to tell that after the first 3 shots at 0.020" I adjusted the vertical turret in order to see the POIs on the white background.

 

[pemo]

Hello,

I am just in the process of going through this exercise with my 6.5x55 Sauer 200 STR using the Moly coated 130grs Norma Diamond Line.

Max load of Norma N1214 is 48.8grs (900 m/s / 2952 fps) and I cut back in 0.5grs intervals to find a good/better node of the Match profile 74cm barrel.

I have match prepped my Norma brass and made 10 of each loads. Two loads revealed just "one ragged hole" on 100m - 3 shot groups after the first session. And today I did another round of three shots group testing and one of the previous good loads generated 18mm C-C spread compared to 6-7mm previously. And this made we wonder about the need for a statistical understanding of these pictures you post.

How many times must a three shot group be better than the other loads for us to be sure that it is statistically significantly better than the other loads. Surely it cannot be based on just one session / one three shot group of each load ?

A lot of unknowns eg. brass volume variations, bullet hold etc...

 

[Marksman63]

After my load development following EC's method, here is my final test at 600 yds.
10 shots - .308 Berger 200 Hybrid at 2770 fps - V-bull is .5 MOA

is it OK or still need further tuning?

 

[savageshooter86]

I'd say you're close

 

[BartsBullets]

Erik,

Went through your method yesterday and selected a load. Today I finished it off with seating depth. I'm shooting a 6 Dasher using my 105 gr Infinity boattails. A couple of good things happen today. I figured out why my rifle was flipping shots and I think I have a pretty good setting depth and load. All groups are 3 shots at 100 yards.

Row 1 is my action with a different fireing pin assembly. Row 2 are the same loads with the original fireing pin assembly! As it turns out it was an ignition problem.

Row 3 are all different seating depths starting at -005 from Jam. Rifle shot pretty good but came to life at -040. It was fairly windy with a good bit of mirage! No chronograph data! My Magnito Speed won't work on this barrel. It's a straight 1.250 and my ladradar is back ordered!

Did I pass?

Bart
Bart's Custom Bullets

 

[SHootSTraight22]

Sorry I forgot to tell that after the first 3 shots at 0.020" I adjusted the vertical turret in order to see the POIs on the white background.

You need to reshoot your seating depth test and see which lengths have the same impact spot.. Pick the window where consecutive loads have the same impact spot.. The load within that window that's the longest would be a good place to start when it comes to picking a load.. This way you never have to adjust your load as your barrel wears because your impact will be the same place (within the window.)

 

[comagutsa]

hey guys just quick question for my 6BR
i did my load testing and found a node and used 30.2gr of 2208 (or varget as you call it) but i wanted to find a quick seating depth so i shot the pic below and will fine tune from here
using berger 108gr BT as we cant get any berger 105gr hybrids in australia atm or just about anything berger in 6mm in australia

now conditions were good as i had set up but the old blokes at the range wanted to talk and it took me nearly an hour to test and by this time it turned to crap, mirage (backed scope off to 25 power) and wind coming from behind swing left to right and back again, gusting but i was there and i wanted to test as don't know next time i could get down
my target was set up at 200m (i normally test at 300m) and couldn't bring it back in as other were shooting so i shot my groups anyway
i saved 4 rounds at end and put magnetospeed on and got an avg of 2907fps with ED 7 and SD of 4

any idea on what ones i should go back and fine tune on better conditions


cheers

 

[rmist]

OK. ..Looking for help !!! . ...today shot these powder charges at 100 yds
This is my 308 Win for F TR rifle. Shot groups of 3 rounds with 185 juggernauts and varget with CCI 450 primers and palma brass 30 " barrel. Shot .010" off the lands. It was shot vertical. It's the way it posted ! Grains of powder and FPS are in the notes for each bull.
What do you think?
Thanks Rmist

 

[savageshooter86]

44.1 to 44.5 look good to me

Seems to be right in line where I see most shooting this combo. Around 44 to 44.2gr. I'm at 44.2 2655fps. Shoots well.

 

[Dos XX]

OK. ..Looking for help !!! . ...today shot these powder charges at 100 yds
This is my 308 Win for F TR rifle. Shot groups of 3 rounds with 185 juggernauts and varget with CCI 450 primers and palma brass 30 " barrel. Shot .010" off the lands. It was shot vertical. It's the way it posted ! Grains of powder and FPS are in the notes for each bull.
What do you think?
Thanks Rmist

If you aren't seeing any pressure signs, I would keep going. You are likely getting close to something.

 

[rmist]

There's no sign of any pressure. ...primers aren't cratered at all. No hard bolt lift. I might go on a little more.
Thanks again