QuickLoad Question

[Murray Brook]

The bullet /start pressure is a subject up for debate. A poster just a while back that has a Trace system posted that the jamming of bullets would never raise the pressure by 7200 psi. He said that start pressure with a jammed bullet would be more like 5000-5500 psi rather than 10825. I tend to believe this.

 

[Murray Brook]

If those figures do tend to produce more accurate results, I am surprised that Neco doesn’t change the default numbers to match.

My thoughts exactly. I've tried to research this but to no avail.

 

[BCBRAD]

The bullet /start pressure is a subject up for debate. A poster just a while back that has a Trace system posted that the jamming of bullets would never raise the pressure by 7200 psi. He said that start pressure with a jammed bullet would be more like 5000-5500 psi rather than 10825. I tend to believe this.

I have loaded ammo with QL a lot in the past 4-5 years. Last month I loaded for my 260 Rem target rifle, I shoot everything everytime beside a Labradar. Same load as always, however, velocity was up 100+ ft/s. Here was the problem, I set COL from another 260 Rem 'dummy' round which had a longer COL ,thus jamming the bullet.
I back engineered the velocity and low and behold the figures worked out for the jammed bullet.

 

[Murray Brook]

That's good to know. So you feel that the 7200 psi figure is valid.

 

[BCBRAD]

That's good to know. So you feel that the 7200 psi figure is valid.

Yes I do, I take anything that QL describes /prescribes at face value.
Many users have trouble , I think, because they try to mix traditional methods & myths of finding a load with QL.

Just got back from the range (exercise of the day was bench technique and is H-4350 better than RL-22 for this application), the same 260 is on a node for the barrel length, where ever the 'dot' was when the trigger was released is where the bullet went.

I don't think my rifle can do any better.....but I sure need to improve.

 

[Butte Sink]

BCBRAD,

I’m thinking you maybe right on regarding jamb & pressure.
So I made major rookie mistake and I did bring this up in another thread.
I did a load with a Nosler bullet and by mistake did the exact same load again, at different time, but with a Berger bullet.
When doing my seating depth, I thought I was .010 jump but in reality with the Berger I was actually jamming the riffling by .080. No issue at all with that load and it shoots lights out but I’m not comfortable with that being a hunting load and did make all corrections needed to get it back to a starting point with .010 jump.
This brings me back to beginning of this thread “reason for the pressure jump” roughly 6000psi
Now with it corrected, I just need a range to open and get a chrono reading to see were it’s at but what you stated I believe has answered my questions!!

 

[Murray Brook]

@BCBRAD You guys on the west coast are lucky that the snow is mostly gone and you can shoot. I'm still knee deep here.

 

[ASD9055]

I was glancing at something earlier and the conversation was a “weighting factor”
They talked about a graph sheet showing different factors
http://www.mamba-reloading.co.za/QL Weighting Factor.xls
I didn’t really get into it but is this what you maybe referring to?

Do you by any chance still have a copy of this Factor.xls sheet. Can't get it on mamba

 

[ASD9055]

I opened it with Open Office (free). Here is a sneak peak.
View attachment 1169842

Any way I can get a complete copy of this file?

 

[Beiruty]

Can you post the "input data" you used
For the
Case capacity
COAL
Exact bullet you used
Powder, charge
Magnum Primer used
Barrel length

I would like to run a GRTiools sim to find out how far it would be to your observed MVs.

 

[jepp2]

Any way I can get a complete copy of this file?

I looked and it must have gotten deleted when I did a reinstall on my laptop. Surprised I didn't have a copy on the NAS, but so far I can't find it. Appears it is no longer available on the web. Sorry.

 

[ASD9055]

I looked and it must have gotten deleted when I did a reinstall on my laptop. Surprised I didn't have a copy on the NAS, but so far I can't find it. Appears it is no longer available on the web. Sorry.

Thanks anyways, I found one that has both the QL WF and GRT Sebert.

 

[NCIowan]

Thanks anyways, I found one that has both the QL WF and GRT Sebert.

Would you be able to share this?
Thanks,
Duane

 

[ASD9055]

Would you be able to share this?
Thanks,
Duane

I found this on the internet yesterday and I am posting here. I don't remember where I found it. Afterwads, Mr. Cassie Nienaber send me the one he had. I believe they are the same.

Oops, it was on the LRH forum

 

[NCIowan]

Thanks ASD. Appreciate your help.
Duane

 

[ASD9055]

Just like everything else, but especially when ti comes to modelling, use everything with caution. Just because it is published, its not necessarilly right. But at least it is a starting point.