OCW 28nosler

[Gobears16]

Decided to try RE33 based on everyone’s results and do a OCW Test. Shot 83,84,85 then did a 3 shoot group with 85.6, 86, 86.4. started with a .04 jump as that’s as far as my mag box will let me. I never saw pressure signs. Unfortunately I didn’t have a chronograph.

Aim point was the tips of the diamonds.

85.6: .51 MOA
86: .58 MOA
86.4: .53 MOA

What’s your expert opinions on where I should narrow my load. I know this powder isn’t very stabile. Should I go with the lower powder charge or go in the middle? Go for speed? Seems like this gun shoots everything well. I don’t know if it’s worth chasing smaller groups and waste barrel life.

 

[BigTex]

There is not enough info here. I think you'd be better off doing the full OCW test. Which corners were you aiming at?

 

[Gobears16]

There is not enough info here. I think you'd be better off doing the full OCW test. Which corners were you aiming at?

I was aiming at the tip of diamond where the crosshairs meet ( 6, 9, 12 o’clock)

 

[BigTex]

I think you'd get better results from loading up 6-9 (3ea) loads 0.3gr apart and shoot them on a target designed for OCW testing.

 

[Ranger188]

I agree, not enough to go by.
If you didn't see any pressure signs at 86.4
then I would end their and go down by .3 of powder
at least with 10+ rounds ( one per charge weight.
You need some way to measure the velocity, or your wasting your time
doing a 10 shot ladder test.
Otherwise you can start with the 84.6 and go up by .3 powder weight and load
3 per and do a grouping test. You still need to do 10+ groups to make
sure you cover at least one node and maybe 2 if lucky
Don't change anything but the charge weight, keep the jump @ .004 for all rounds
put 2 targets up next to each other and try to get it sighted in on the center dot
you can use the points of the red triangle to line up the reticle, horizontally and vertically
that will give you 10 targets, 5 per target. You need the same aim point
so you can see the node coming and going.
Let the barrel cool once in awhile and take a break if you feel tired
but do it all in one session.

 

[Deleted member 113831]

86.2 grains

 

[Gobears16]

I agree, not enough to go by.
If you didn't see any pressure signs at 86.4
then I would end their and go down by .3 of powder
at least with 10+ rounds ( one per charge weight.
You need some way to measure the velocity, or your wasting your time
doing a 10 shot ladder test.
Otherwise you can start with the 84.6 and go up by .3 powder weight and load
3 per and do a grouping test. You still need to do 10+ groups to make
sure you cover at least one node and maybe 2 if lucky
Don't change anything but the charge weight, keep the jump @ .004 for all rounds
put 2 targets up next to each other and try to get it sighted in on the center dot
you can use the points of the red triangle to line up the reticle, horizontally and vertically
that will give you 10 targets, 5 per target. You need the same aim point
so you can see the node coming and going.
Let the barrel cool once in awhile and take a break if you feel tired
but do it all in one session.

Wow I appreciate the detailed response... I will go back in the next day or two and set up a bigger sample size. I’ve looked up OCW target and will print out a few and then start sending rounds down range. The more I’ve researched tonight I noticed my rear bag set up is t as consistent as it needs to be for this test....I hope I don’t find myself chasing my tail for those last bits of accuracy and wasting barrel life but I feel I can get a few more the tenths out of my groups. This will be set up for long range elk and deer.

I’ll also try and locate a Labrador or Magntospeed for the test. Does the MS affect accuracy?

 

[Ranger188]

A Labradar would be the best choice but if you can find a Magnetospeed thats
very accurate, but since your attaching it to the barrel, it will change the point of impact ( POI )
and might affect the groups, by changing the harmonics of the barrel.
The Magnetospeed should be used for the 10+ shot ladder test only, since your looking for the muzzle
velocity changes.
The Labradar can be used for both.
That's why it's important to do either test once the barrel is broken in and do it right the first
time, as to not used up valuable barrel life.

 

[Gobears16]

Welllll I couldn’t waste an opportunity of good weather as it’s supposed to be crappy for the next 5 days. I loaded 86.4-85.1.

 

[Gobears16]

Well The weather forecast for the next few days looked horrible so I ran out and loaded some bullets and hit the range. I started at 85.5 and went up to 86.4. I was shooting with a bipod and a rear bag. Groups looked okay and wish I would have had a front rest as I noticed when I didn’t load the bipod The impacts went low, I shot an extra at each charge because I thought I pulled the shot. I released I was loading the bipod and had a much better hold on the target while dry firing... I went back to the shop and loaded 85.1 and 85.3 as it looked like 85.5 grouped well when I loaded the bipod, I also made a smaller target as I thought it would help refine the aim point. I was glad I did because I shot my best group ever and if I stack the 85.1,85.3, 85.5 they are all nice and tight. I think I will go with 85.2 and run with it. What do you guys think?

 

[Ranger188]

Looks like you have a good load.
Just load a couple more and hopefully it repeats it's self
Nice job. That looks like a elk killer..
You'll also need to get a speed on them to figure drop at distance.

 

[Gobears16]

I will definitely get More long range sessions before deer and elk season 300-1200yards. My hunting partner has the Magnetospeed and I’ll be using that to get velocities for drops.... I’ve got a Seekins Havak 6mm to shoot all spring and summer to feed the addiction of precision rifles. Hopefully save some barrel life on this one.