H20 case fill Quickload question

[TackDriv3r]

I am stumped with a reading on QL for my 7mm Mag. I used the Berger 140 grain VLD under 66.7 grains RL19 for a chronograph reading of 3250 fps this morning. I have a 25.5 inch barrel.

The QL program default reading for H20 is 82 grains, so I changed it to 88 after the average of weighing 5 cases. I weighed each unsized fired empty brass ( 5) for a final weight of 219.5 grains and 5 fired unsized cases of H20 and ave weight is 307.8 and final weight after calculations is 88.4 grains of H20, so i entered that in the tab in place of the program's reading which was 82 grains. Now I added the charge weight, and other data.

Now my velocity is way lower by 220 fps slower than my chrono reading and 100 fps slower than the program's 82 H20 reading. I tried the same weighing method with my 6.5 Creed and 6.5 x 284 and reading is just off by .4 to .6 grain of H20 which is normal. Why is the 7 Mag reading off by 6 grains? Could someone help me with this issue? Please check the link, Thanks
http://imgur.com/a/fMbWx

 

[savagedasher]

I am stumped with a reading on QL for my 7mm Mag. I used the Berger 140 grain VLD under 66.7 grains RL19 for a chronograph reading of 3250 fps this morning. I have a 25.5 inch barrel.

The QL program default reading for H20 is 82 grains, so I changed it to 88 after the average of weighing 5 cases. I weighed each unsized fired empty brass ( 5) for a final weight of 219.5 grains and 5 fired unsized cases of H20 and ave weight is 307.8 and final weight after calculations is 88.4 grains of H20, so i entered that in the tab in place of the program's reading which was 82 grains. Now I added the charge weight, and other data.

Now my velocity is way lower by 220 fps slower than my chrono reading and 100 fps slower than the program's 82 H20 reading. I tried the same weighing method with my 6.5 Creed and 6.5 x 284 and reading is just off by .4 to .6 grain of H20 which is normal. Why is the 7 Mag reading off by 6 grains? Could someone help me with this issue? Please check the link, Thanks
http://imgur.com/a/fMbWx

How are seating your bullets jumped or jammed ?

 

[TackDriv3r]

It's .020 off the lands.

 

[savagedasher]

It's .020 off the lands.

I would try another crony . Not running the numbers but 3250 with a 25.5" barrel seems fast Larry

 

[jlow]

Did you enter the correct OAL for your rounds and barrel length?

 

[Joe R]

[

I am stumped with a reading on QL for my 7mm Mag. I used the Berger 140 grain VLD under 66.7 grains RL19 for a chronograph reading of 3250 fps this morning. I have a 25.5 inch barrel.

The QL program default reading for H20 is 82 grains, so I changed it to 88 after the average of weighing 5 cases. I weighed each unsized fired empty brass ( 5) for a final weight of 219.5 grains and 5 fired unsized cases of H20 and ave weight is 307.8 and final weight after calculations is 88.4 grains of H20, so i entered that in the tab in place of the program's reading which was 82 grains. Now I added the charge weight, and other data.

Now my velocity is way lower by 220 fps slower than my chrono reading and 100 fps slower than the program's 82 H20 reading. I tried the same weighing method with my 6.5 Creed and 6.5 x 284 and reading is just off by .4 to .6 grain of H20 which is normal. Why is the 7 Mag reading off by 6 grains? Could someone help me with this issue? Please check the link, Thanks
http://imgur.com/a/fMbWx

I'm not familiar with the 7mm Mag, so I can't help you there, but I do know QL. Are you new to QL?

Is the other cartridge information correct? Case length and OAL? Have you adjusted for the ambient temperature? What about the Ba Burning Rate factor and the Shot Start Pressure? Those look like they are still in the default values.

 

[TackDriv3r]

Did you enter the correct OAL for your rounds and barrel length?

Yes, the OAL and barrel length is correct.

 

[TackDriv3r]

[

I'm not familiar with the 7mm Mag, so I can't help you there, but I do know QL. Are you new to QL?

Is the other cartridge information correct? Case length and OAL? Have you adjusted for the ambient temperature? What about the Ba Burning Rate factor and the Shot Start Pressure? Those look like they are still in the default values.

No, I did not touch the Ba burning rate factor or the shot start. I assumed if you change the powder, the Ba burn rate factor changes itself. I had QL for a couple months now. Is there a list of burning rate factors Ba?

 

[Joe R]

Here's a paper that Chris Long wrote, you'll find this very helpful.

Good luck,

Joe

 

[savagedasher]

What FB Larry

 

[savagedasher]

What FB Larry

Why would you use a un size fired brass to set your case capacity . You have added. 6.4 more grain to the default setting . That is over 10 percent difference . When you do H 20 capacity size the case and trim to length
Install a sent primer in bottom side up. Put the case on the scale and zero the weight. Carefull fill the case Wipe off the bubble and dry any excess off then weight. That is a references of one case . Do the same to at least 2 others. That will give you case capacity . To enter . I see you only have
Only .135 Shank of the bullet in the case is that a mistake? My advice is go back to the default setting and start over . Larry

 

[Twoboxer]

Why would you use a un size fired brass to set your case capacity . . . .

From the QL manual, pg 64:

"This measurement [determining average (case capacity] is easily done using a dry, empty fired case (with fired primer in place)."

Later down the page:

". . . for rifle and other guns using peak pressures above 30,000psi use a case fired from the specific gun you are working with. Do not resize the case before making the capacity measurement."

You want the volume of water contained in your chamber less the volume of the brass in your case. The SAAMI chamber presumably represented by your sizing die is of no interest.

 

[Joe R]

From the QL manual, pg 64:

"This measurement [determining average (case capacity] is easily done using a dry, empty fired case (with fired primer in place)."

Later down the page:

". . . for rifle and other guns using peak pressures above 30,000psi use a case fired from the specific gun you are working with. Do not resize the case before making the capacity measurement."

You want the volume of water contained in your chamber less the volume of the brass in your case. The SAAMI chamber presumably represented by your sizing die is of no interest.

Good man, you nailed it.

Joe

 

[savagedasher]

From the QL manual, pg 64:

"This measurement [determining average (case capacity] is easily done using a dry, empty fired case (with fired primer in place)."

Later down the page:

". . . for rifle and other guns using peak pressures above 30,000psi use a case fired from the specific gun you are working with. Do not resize the case before making the capacity measurement."

You want the volume of water contained in your chamber less the volume of the brass in your case. The SAAMI chamber presumably represented by your sizing die is of no interest.

Sorry I don't agree .
Your doings the same as I do when we fire fourm brass When we load for fire fourm we use the capacity of 6 mm BR Not the dasher size .
H20 capacity is used two when loading
1 for powder drop and pressure and loading
2. To check the cases and sort Their internal size one could hold 66 .0 and the next 66.6
That's when I laugh when someone says the measure to the kernel And the case very 50 . Larry

 

[dmoran]

Obviously there is QuickLoad's ways.... and then there is Larry's ways.... lol

 

[Zero333]

Don't forget to measure the bullets oal and use that measurement instead of QL's measurement for that bullet.

 

[Twoboxer]

Sorry I don't agree .
. Larry

As long as you've convinced yourself that QL is wrong, feel free to carry on.

 

[savagedasher]

As long as you've convinced yourself that QL is wrong, feel free to carry on.

Have used it 13 years it hasn't failed me yet. So I will Larry

 

[Joe R]

Have used it 13 years it hasn't failed me yet. So I will Larry

Larry,
I'm pretty sure you don't have a copy of QL. So, don't you find it a little bit odd that you're here giving advice on software you don't even have?

Kindest regards,

Joe

 

[savagedasher]

Larry,
I'm pretty sure you don't have a copy of QL. So, don't you find it a little bit odd that you're here giving advice on software you don't even have?

Kindest regards,

Joe

Your correct I don't have one .
I would guess I have over 10 up dates .
If you were at the shot show you would of seen our product in his booth.
Sometimes it don't pay to be sure. Larry