338 ocw opinions?

[Kampfjager]

Hey guys, just did this ocw and this was my results..... thoughts?

 

[Blackdirt Cowboy]

That's a tough one. There almost no vertical at 88.7. But it looks like 89.5 to 90.1 grouped in the same general area and in similar fashion. Were it me, I'd prolly load up around 89.8 and play with seating depth to see if I could get the groups to tighten up a little bit.

 

[Tiny Tim]

^^^^ This. What distance was this shot at? 89.5-90.1 looks like a stable node. As above, load to the middle of the node and adjust seating depth.

 

[QuietTexan]

What did you use for COL/CBTO?

I agree with working seating depth around 89.8, but I'd also load 5x at 88.7 just to see if it that speed was an oddity.

 

[Dmagna]

Yeah have any numbers for these groups? Speed and standard deviation?

 

[Kampfjager]

That's a tough one. There almost no vertical at 88.7. But it looks like 89.5 to 90.1 grouped in the same general area and in similar fashion. Were it me, I'd prolly load up around 89.8 and play with seating depth to see if I could get the groups to tighten up a little bit.

Exactly what I was thinking, sir..... thank ya

 

[Kampfjager]

^^^^ This. What distance was this shot at? 89.5-90.1 looks like a stable node. As above, load to the middle of the node and adjust seating depth.

100 yards

 

[Kampfjager]

Yeah have any numbers for these groups? Speed and standard deviation?

No velocities yet, ill get velocities once my node is found..... I use a magnetospeed and that alters group size and poi...... so me getting velocities while running an ocw would show a false reading...

 

[Kampfjager]

What did you use for COL/CBTO?

I agree with working seating depth around 89.8, but I'd also load 5x at 88.7 just to see if it that speed was an oddity.

I will have to get those lengths to ya..... they are sized to the magazine which sets it at 0.060" jump

 

[338 dude]

Hey guys, just did this ocw and this was my results..... thoughts?

It looks like it's starting to come together go a little higher if you're not seeing pressure signs

 

[JMW67]

If you did not run into pressure I would go a little further and see what happens, If you did blackdirt is on the money

 

[Kampfjager]

It looks like it's starting to come together go a little higher if you're not seeing pressure signs

I'm not seeing pressure signs, so yes I can go higher.... but is there a trade off?..... throat erosion, temperature instability, etc ?

 

[338 dude]

I'm not seeing pressure signs, so yes I can go higher.... but is there a trade off?..... throat erosion, temperature instability, etc ?

There is always a trade-off but the actual difference between a grain or two I don't believe would be noticeable over the life of a barrel

 

[Kampfjager]

There is always a trade-off but the actual difference between a grain or two I don't believe would be noticeable over the life of a barrel

I'm anxious to see what what the velocities look like at 89.9-ish.... it will be awesome if SD & es are tight