Blown primer in .243 Ackley

[243winxb]

Your copper bullet and L brass both require a reduced powder charge.

Nech turning is also needed to remove the donut at the neck shoulder junction to better fit yout tight neck chamber.

 

[adam32]

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

They were .025 off the lands.

Even changing COAL and case capacity a lot didn't make a huge difference in the calcs. Never even over 60k.

I used a 95gr TSX in the program since the LRX isn't listed.

Once I changed shot start pressure in QL it went up to about 64k. Even that pressure "shouldn't" blow a primer especially in fresh brass.

I really think it's a donut issue hanging onto the bullet and possibly too tight of neck with the Lapua brass. I'm going to measure and form up some Win brass then start again with a chrony at 38gr.

 

[denobravo]

They were .025 off the lands.

Even changing COAL and case capacity a lot didn't make a huge difference in the calcs. Never even over 60k.

I used a 95gr TSX in the program since the LRX isn't listed.

Once I changed shot start pressure in QL it went up to about 64k. Even that pressure "shouldn't" blow a primer especially in fresh brass.

I really think it's a donut issue hanging onto the bullet and possibly too tight of neck with the Lapua brass. I'm going to measure and form up some Win brass then start again with a chrony at 38gr.

good luck, stay safe
10-7

 

[Rich Coyle]

What is 10-7?

 

[adam32]

What is 10-7?

Police lingo...10-7 is out of service/signing off

 

[TX Badger]

I actually did acknowledge it, I said I didn't know the exact COAL but know it wasn't touching or jammed. And then followed up later after measuring that I was correct and was .025 off the lands. And like I figured from that first page, COAL is not the issue.

[/QUOTE][/QUOTE]

I think the concern people had was that you listed COAL and not BTO so people were questioning how you knew how far you were off the L&Gs.

 

[coyotezapper]

Yup, changing the Shot Start Pressure definitely bumped the chamber pressure WAY up. Thank you for that info!!!

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

Where are you getting the 68K number?

 

[adam32]

Where are you getting the 68K number?

Experience, and knowing rifles are running at 65-70k and not blowing primers. So it was more of an educated guess that 68k and above is when someone should start seeing issues of blown primers. Definitely not below 60k.

 

[coyotezapper]

Experience, and knowing rifles are running at 65-70k and not blowing primers. So it was more of an educated guess that 68k and above is when someone should start seeing issues of blown primers. Definitely not below 60k.

Not sure that answer is valid. "Knowing rifles that are running 65-70K" Without pressure testing equipment how do you know the pressures?

I would like to see all of your QL input data to see why your pressure prediction is so low. Like I said before using a different bullet to establish load data is not a good idea. I will say this though, .025" jump is too close to the lands and is most likely the culprit. Start over at .050" jump. Barnes solids like to jump and are very accurate if loaded right.

 

[adam32]

Not sure that answer is valid. "Knowing rifles that are running 65-70K" Without pressure testing equipment how do you know the pressures?

I would like to see all of your QL input data to see why your pressure prediction is so low. Like I said before using a different bullet to establish load data is not a good idea. I will say this though, .025" jump is too close to the lands and is most likely the culprit. Start over at .050" jump. Barnes solids like to jump and are very accurate if loaded right.

The guys with those rifles have pressure testing equipment.

I loaded 4 more up at .050 jump, even at 40gr's I'm getting an ejector mark. I'm really leaning towards carbon ring/tight neck with Lapua brass and a possible donut.

I'll take a picture of quickload later today.

 

[coyotezapper]

The guys with those rifles have pressure testing equipment.

I loaded 4 more up at .050 jump, even at 40gr's I'm getting an ejector mark. I'm really leaning towards carbon ring/tight neck with Lapua brass and a possible donut.

I'll take a picture of quickload later today.

I don't remember, did you turn your necks? If a bullet will not freely drop into a fired case it sounds like you have a tight neck chamber and need to turn your necks. The case neck has to have room to expand and contract. Stick with this bullet, it hits like a sledgehammer.

 

[adam32]

I don't remember, did you turn your necks? If a bullet will not freely drop into a fired case it sounds like you have a tight neck chamber and need to turn your necks. The case neck has to have room to expand and contract. Stick with this bullet, it hits like a sledgehammer.

No, I haven't turned necks yet. I never had this issue with Bergers or V-max.

 

[denobravo]

[/QUOTE]

I think the concern people had was that you listed COAL and not BTO so people were questioning how you knew how far you were off the L&Gs.[/QUOTE]
yes there is that
actually I have never read where he listed the COAL...only how far off the lands which is not the COAL
The boxes on QL as for cartridge length, COAL, bullet length seating depth, barrel length.
If the bullet is not listed you have the option of creating the bullet profile
but no where does it ask for distance from the lands. So it became very hard to help problem solve and one member indicated resistance from the OP.

 

[denobravo]

Don't you think the homosexual community doesn't need you to defend them? After all they are adults.

maybe I am one