Still doubts about shoulder bump...

[Bora72]

That's phenomenal! is that a 4 or 5 shot group there?
The fact you are using a bipod also shows your technique for holding the rifle, pressure etc is very good.
Since bipod discipline can be something that takes awhile to learn to get the gun to react the same every time

They are 4 shoots, velocyes on the target side (m/s).
Thanks for the compliments.
Yes, shooting with a bipod, especially a Harris bipod, from the bench requires a certain technique, but I can't always put it into practice; I still need to gain experience.
I'd like to buy a bipod like the Atlas BT72 or AccuTac FC5G2.
Where I shoot, the targets aren't all on the horizon; some, the furthest ones after 200 meters, are upward, even at 15-20° angles.
I'm not sure I'd be able to shoot with them with a non-tactical bipod like the JoyPod.

 

[Bora72]

An 'O' ring between the die and press and in place of the shell holder clip can be helpful for alignment.

Oh, thanks for the advice.
When I have cases to resize again, I'll try both the O-ring under the die and in place of the shellholder clip.
Otherwise, I'll change presses. I'm sure, as you advised, there's no need to change presses for this little misalignment, but you know how it is when you don't like something and can't get over it...

 

[Bora72]

You cannot anneal at 750/800F. you may be stress relieving. You need to be at about 1050/1100F to anneal. The neck should just turn red for 1-2 seconds.

When I look at the charts I compare 15% cold work reduction in thickness to the several temperatures. It seems like a good guess at % cold work since we don't know the actual %. The trends are what I look at rather than the actual numbers. The next chart in the report was 600C=1112F this is much higher than I want. The shortest time in the study was 15 seconds at temp in a lead bath. The sample had thermal couples on them and time was time at temp

What I see is practically nothing happens at 15 seconds at temp at temp in a lead bath.

There are many scales for reporting hardness this study used the Rockwell H scale. The cold work was achieved by cold rolling a small plate about 1/8" thickness to various thicknesses. Don't jump on they are not cartridges. The numbers basically give you an idea of what's going on.

Results:
15% cold work 30 seconds at 842f showed a .8 RH increase. 10% cold rolled showed 2 unit decrease. Probably within the error because they are different pieces of metal even though they were processed under similar conditions.

1/2 hr at temp before grain size changes.
450C=842F
View attachment 1714676
550C=1022F
View attachment 1714674



Below are the results of my annealing study done at work on cartridge necks annealed in a small laboratory accurate furnace. I chose 15 sec hold time in the furnace since I didn't know how long it took the neck to reach temp. 5 minutes at 800F the hardness only dropped about 2 units HRB sale.
View attachment 1714679

Webster, thanks for the explanation.
I had some undersized cases and used them to make the video, but I forgot to set the firing time to 4 seconds.
That's enough time for turned necks.
For non-turned necks, I use 4.5 seconds.
I'll make a new video tonight and tell me if you think it's okay.
If I leave the case annealing for 15 seconds, all that's left is the case head...

 

[ELR LVR]

Looks like you did a great job. What temp do you think the necks are reaching. I don't see a color change in the video?

I just relooked at his video, nice work
I couldn't see color change at first either
the body seems to be hidden and only the neck opening visible
---
Nothing happens for 3 seconds then
The neck just begins to glow red right at the last second and then drops away instantly through a chute
It's hard to catch because as soon as the neck starts to glow, the case drops away

 

[Murray Brook]

I believe you posted that your rifle was a factory rifle. If this is the case then change nothing. Those groups are great, and IMO will not be improved upon regardless what you do. You might only make them worst. JMO