Blown primer in .243 Ackley

[theosmithjr]

I ran some numbers in Quick load and the program says you are overcharged and are in a high pressure zone

The only logical explanation here fellas is INEXPERIENCE! GUESSTIMATING & TRULY OVER CHARGED EXTREM HOT LOADS! Hes extremely Lucky he walked away LQQKING the same and that the Bolt Luga did their job & held it! I'm willing to bet if a Smith LQQED at it under a microscope there are gonna be miniscual Stress cracks! Theosmithjr

 

[adam32]

I ran some numbers in Quick load and the program says you are overcharged and are in a high pressure zone

What PSI?

 

[TXAoudadKlr]

I ran out of pressure...I can't recall if it was 99 or 101gr but I ended up using 3-5gr less powder with the 200gr LRX compared to my 200gr accubond load.

 

[denobravo]

What PSI?

52931

 

[denobravo]

What PSI?

53964

 

[denobravo]

The only logical explanation here fellas is INEXPERIENCE! GUESSTIMATING & TRULY OVER CHARGED EXTREM HOT LOADS! Hes extremely Lucky he walked away LQQKING the same and that the Bolt Luga did their job & held it! I'm willing to bet if a Smith LQQED at it under a microscope there are gonna be miniscual Stress cracks! Theosmithjr

you are correct sir

 

[adam32]

53964

Max should be 55-58k for a standard .243 win casing. It "shouldn't" blow primers until well over 68k plus.

 

[muleystalker]

Adam There is a Guy running 47.6 Grains of H4831sc with a 95 NBT. He is around 3140 FPS. Another runs 44 grains of the same powder with a 100 NP. tot eh tune of about 3050fps. Last but not least another guy runs 47.2 grains of same powder with 107smk bullets to the tune of about 3240 fps ..

You guys can't compare lead cot bullets to mono bullets by weight. Just because a 105 lead core Bullet works with a given weight of powder doesn't mean it will work with a monolithic Bullet if same or a little lesser weight. Most the times a mono Bullet is going to have quite a bit longer bearing surface than a lead core given the mono is made from less dense material. That means they have to use more material to get the weight, the material has to go somewhere, thus the longer Bering surface. Longer Bering surface means more pressure

 

[NEMTHunter]

You guys can't compare lead cot bullets to mono bullets by weight. Just because a 105 lead core Bullet works with a given weight of powder doesn't mean it will work with a monolithic Bullet if same or a little lesser weight. Most the times a mono Bullet is going to have quite a bit longer bearing surface than a lead core given the mono is made from less dense material. That means they have to use more material to get the weight, the material has to go somewhere, thus the longer Bering surface. Longer Bering surface means more pressure

Thanks again for bringing this up.

Never did I say they were safe for the solids. Then again neither did I say they were not safe for the solids. But I do recall and maybe you did not see it. I said I suggested I would start @ 40 grains and worked up from there.

Just because it's solid copper does not in any way mean it has a longer bearing surface. There are plenty solids that have shorter bearing surfaces then the lead core bullets. Most modern solids have just as short bearing surface and in same cases even shorter. hence for the same weight they need a faster twist. they stretch the bullet out to get the weight. Again we can not make it a blanket statement. I feel there is more to it then the powder charge.

Max should be 55-58k for a standard .243 win casing. It "shouldn't" blow primers until well over 68k plus.

This is right. Or close to it. ANSI/SAAMI list the .243 win with a MAP of 52,000 CUP. OR 60,000 PSI.

55 to 58k PSi is below max suggested.

 

[denobravo]

Thanks again for bringing this up.

Never did I say they were safe for the solids. Then again neither did I say they were not safe for the solids. But I do recall and maybe you did not see it. I said I suggested I would start @ 40 grains and worked up from there.

Just because it's solid copper does not in any way mean it has a longer bearing surface. There are plenty solids that have shorter bearing surfaces then the lead core bullets. Most modern solids have just as short bearing surface and in same cases even shorter. hence for the same weight they need a faster twist. they stretch the bullet out to get the weight. Again we can not make it a blanket statement. I feel there is more to it then the powder charge.




This is right. Or close to it. ANSI/SAAMI list the .243 win with a MAP of 52,000 CUP. OR 60,000 PSI.

55 to 58k PSi is below max suggested.

sorry guys its 55200 MAP
I hurridly just gave the pressure without looking at the type
A mistake by an experienced reloader

But I have to ask
If you use quick load
How did you not see it yourself

 

[Rich Coyle]

The Barnes manual is old.... But... It does state, and it is true..... DO NOT SEAT BULLETS ANY CLOSER THAN .050. As a matter of fact, most people have found that .100 to .125 off the lands and grooves proves more accurate and with more speed.... Remember- these are a solid bullet and they liked to be forced with jump. Most all, if not all Barnes factory ammo is set at about .125 off.
If the rifle is chambered correctly, most Barnes factory ammo is very accurate. Your hand loads will be too, just give them some jump.

One of my rifles is .120 off and the other is .180 off to get accuracy.

 

[adam32]

sorry guys its 55200 MAP
I hurridly just gave the pressure without looking at the type
A mistake by an experienced reloader

But I have to ask
If you use quick load
How did you not see it yourself

I came up with 45k when I did the calcs.

 

[denobravo]

I came up with 45k when I did the calcs.

ok..
so you have measued COAl or BTO and have a solid bullet profile and barrel length
what are they?
you have to input case length
bullet length
and COAL
How could you have done this without measuring

 

[denobravo]

What would be the poor loading practice? I know they aren't at the lands, even if they were I don't see it being that much overpressure with a mild load???

not measuring is poor loading practice and this is where it began
After re reading the comments I am sorry I got sucked in.
My apologize to all
Stay safe folks 10-7