My try at HV cast

[fiver]

I wouldn't be too sure about that.
when I use H-414 with jacketed 150's.
I pretty much just full length size them so I have .005 neck tension then fill the case to about half way up the neck and seat the bullet down compressing everything to about 105%.

 

[Will]

In my velocity test loads I went up to 47gr which was still a little below the case neck. That charge gave me 2476 FPS

 

[Ian]

I did about 45 grains to get the volume I wanted and made up the difference with buffer, both to seal and protect the bullet and to bump the burn speed up some. When you get H414 up to the full-case level it really starts to work well, but doesn't get stupid with sudden pressure rise.

 

[Will]

Shot again today and more of the same. I’m not sure what to tweak next.
Today’s ammo was loaded in the thicker necked lake city brass. I tried several loads with W760 behind the 308 hunting bullet and the groups sucked.
Had a couple groups with 4350 that would have been good if I could get rid of the flyer. The bigger charge of 4350 seemed to drop the SD’s down but didn’t increase velocity much.

 

[fiver]

oh man that flyer.
that would have been a beautiful group.
I think your there with that powder.
once the velocity levels off like that adding more just ups the pressure.

 

[Will]

The question is how to get rid of that flyer. I may try to load up some 10 rounds test loads. That will give me a real idea of how the load is performing.

I think the little bit of compression I’m getting with a full case of 4350 is really helping it to burn more consistently.

May also start messing with seating depth a little.

 

[fiver]

hard to tell what it is.
neck tension.
wet lube.
a small void [shrug]
a softer or hotter primer blast.
gas check a little crooked.
all we can do is look for a pattern or pull the case..

 

[Will]

Forgot to add this pic. This one was a heartbreaker.

 

[waco]

Loading up more RX15 with the 30 XCB for a long range test. Hope to be more consistent at 500.
Loading up new Starline brass with same bullet using H414 for the first time. Going to stick with my guns and run a Satterle test again.
Seems to work. I'll load up 10 rounds from 46.0gr-47.8gr
These should run between 2480 and 2600

 

[Will]

I’ve got velocity data with w760/h414 and the xcb if you want it Waco.

 

[waco]

I’ve got velocity data with w760/h414 and the xcb if you want it Waco.

Sure. I'll take a look. This is going off Qiuck Load Data Brad gave me using new Starline brass.

I'd be interested in seeing your results to compare notes if nothing else.
Thanks Will.

 

[Will]

I’ll put it in the xcb thread so people don’t get confused.

 

[Ian]

It would help when referring to the "XCB" whether it is the bullet itself (NOE 30-whatever it is) or the cartridge. Fiver and I both have rifles chambered in the .30x57mm XCB cartridge, and he's been generating as much data with that rifle as he has with .308 Winchester shooting the NOE XCB bullet.

 

[fiver]

I have been trying to make it clear which is which, but much of the data has overlapped.

 

[waco]

Sorry. I'm just testing .308