Thread: How hot?

Exactly

How many stamps out of say 50 shots is to many?

Going to go and shoot a case till it dies at that charge an measure on the way as well

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See ya in 3 shots then?

Once I think I have settled on a load I test a case till it dies. Takes a wee while as I want the barrel cold for every shot.

Originally Posted by R93

See ya in 3 shots then?

Once I think I have settled on a load I test a case till it dies. Takes a wee while as I want the barrel cold for every shot.

You you have money on 5 shot life?

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Na! You know what your doing and you are smarter than me coz you speak fluent Swahili. Hard to judge things like that without seeing first hand. It will be interesting.

Originally Posted by R93

Na! You know what your doing and you are smarter than me coz you speak fluent Swahili.

hahahahaha

I get ejector stamps like that randomly when using Norma brass. No other pressure signs at all, every powder charge weighed, every loaded round measured for length to ogive... Mate has a 7mmRM that does the same with Norma brass

It is soft thats for sure.
Will be interesting how long my wsm brass will last, its on its 4th firing using rl17.
Nice and uniform tho and very well priced, cant see myself changing

I get same thing in my screamer as well little slap every now and then to most will when couple of gr off the top only needing small things to push it up.

I get 12 firings out my 6.5 300 with it before necks start to die but I toss it after 10 with most my easy brass since new is nice

Even after 10 firings brass etc cost is nothing

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I reckon you will get 8 from ya blaser mag brass using that load.

Originally Posted by L.R

I reckon you will get 8 from ya blaser mag brass using that load.

That case had 12 firings now gave it 10 them still holding primer but split the neck.. . . Body sized twice in that.
Speed dropped off a little to what I told you yesterday but only 40feet

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Originally Posted by tui_man2

That case had 12 firings now gave it 10 them still holding primer but split the neck.. . . Body sized twice in that.
Speed dropped off a little to what I told you yesterday but only 40feet

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That's pretty good going from Norma brass mate. Now go shove some 180's in the case and report back to me. It's looking to be a very promising chambering.

Originally Posted by Neckshot

looks similar to mine and they arnt hot loads either.Winchester mod 70 action 260ai 6 to 7 firing.
Attachment 12702

Loads not hot ??!!????

Dude, if that is what is happening to your brass your loads ARE way too hot. Lapua cases are generally harder/tougher than most other makes. (i.e. - good.)

Brass swell into the plunger ejector hole, then getting sheared off as you rotate the bolt face on the jammed case.

the primer 'cratering' is caused by the EXCESSIVE pressure pushing the firing pin tip back as the cartridge discharges, during peak pressure.

These are the main fixes for these conditions:

1. reduce your powder charge or neck tension, or take the bullet out of 'jam' condition.
2. Go to a custom action or bolt with a reduced diameter firing pin tip.
3. use primers with a harder 'cup'.
4. Increase the force of your bolts mainspring.
5. Norma brass is notoriously soft compared with other makes, reduce your loading intensity.
6. Go to a stiffer/bigger custom action that is better able to handle the higher pressures.
7. Reduce your loads. velocity for velocities sake is not always a good pursuit.
8. All of the above.


(9. ensure your medical/income protection insurance is paid up if you want to keep pushing the limits of a bit of brass that is the main think separating you from 60,000+ PSI of 'nasty'.........)

Originally Posted by L.R

We all know how hard it is to get lapua case head brass to leave ejector marks tho.

Have definately done it during load development in my own 260 with Lapua .243 brass though. The load was fine if the barrel didn't get too hot and I dropped down as soon as i got a sticky bolt lift with it.

Originally Posted by L.R

That brass looks to only have the 1 ejector mark on it, so if it was fired 6-7 times maybe the fireform load did it?

The fireforming comment is smart. When fireforming i always set the projectile so that when chambered it is hard into the lands. This forces the base of the case hard against the bolt. Maybe if this wasn't done you could get an ejector mark as the case expands in the chamber back toward the bolt face?

Originally Posted by tui_man2

That's only one mate, I need to ladder higher to get better signs an know this combos limits
An will see when I fire the other 5 loaded to this charge again an check speed to the 2 ladders I have done as well

but is it getting a better MOA as you go higher?