Reloading Data Difference

[desertbandit]

I was looking at to reloading data web sites....Barnes and Alliant.....On max powder charge there is a 6 grain difference between the two....Yet the velocities are about the same...They are both RL 26 powder.....Does that sound right??

Thanks, Bandit

 

[10XSHOOTER]

What Cartridge?

 

[CJ6]

I was looking at to reloading data web sites....Barnes and Alliant.....On max powder charge there is a 6 grain difference between the two....Yet the velocities are about the same...They are both RL 26 powder.....Does that sound right??

Thanks, Bandit

Using the same bullets? ?
Hornady and Sierra had a similar issue in their manuals awhile back. One books starting loads were 4 full grains HIGHER than the others MAX loads. Now these were using each other prospective bullets but at the same weights.

 

[desertbandit]

Using the same bullets? ?
Hornady and Sierra had a similar issue in their manuals awhile back. One books starting loads were 4 full grains HIGHER than the others MAX loads. Now these were using each other prospective bullets but at the same weights.

Makes me a little nervous when I see the discrepancy....

 

[Murray Brook]

A great reason to have several different manuals so you can compare data. Keep in mind that bullets of different construction of the same weight will often have different data. JMO

 

[std7mag]

It all goes back to the.....

This load is for MY rifle.
YOUR rifle is different and may not react the same.

Different receivers, different barrels, different length barrels, actual rifle or a test rifle setup, different firing pin, is the firing pin bushed, different chamber reamer..

You get the picture.

Not to mention different lots of powder..

 

[Hipshoot]

It all goes back to the.....

This load is for MY rifle.
YOUR rifle is different and may not react the same.

Different receivers, different barrels, different length barrels, actual rifle or a test rifle setup, different firing pin, is the firing pin bushed, different chamber reamer..

You get the picture.

Not to mention different lots of powder..

AND it depends on how hard you pull the trigger!

 

[Bill Norris]

I was looking at to reloading data web sites....Barnes and Alliant.....On max powder charge there is a 6 grain difference between the two....Yet the velocities are about the same...They are both RL 26 powder.....Does that sound right??

Thanks, Bandit

Lots of variables no doubt. Chambers, barrel lengths, powder lots, cartridge size, atmospheric conditions at locations of testing, etc. and the list goes on.

 

[desertbandit]

What Cartridge?

270WSM.....Both charts list 24 inch barrel with 1-10 twist....Velocity is only 23fps faster with the hotter load

 

[RabbitSlayer]

It is usually less than that, but I have seen discrepancy too. Its my understanding published data can be from quick load, firing and looking for pressure signs, or actual pressure measurement.

Another thought is lot to lot variation in powder and powder moisture. I would like to think they carefully control the powder moisture after it is opened, but who knows. That would be interesting to ask Hornady or other companies.

 

[BHP9]

The other thing to check, if noted, is the equipment used. ie, rifle or test barrel, primers used, and RabbitSlayer already mentioned powder.

 

[Doom]

Look at the COAL!

 

[dellet]

I was looking at to reloading data web sites....Barnes and Alliant.....On max powder charge there is a 6 grain difference between the two....Yet the velocities are about the same...They are both RL 26 powder.....Does that sound right??

Thanks, Bandit

It doesn’t really sound right, but mostly it sounds like missing information. Without knowing the bullet, it’s a pointless conversation.

It looks like you’re using the Barnes 130 tsx. Data has a difference of .075”. “Hotter” load being the longer. That would explain the discrepancy.

Add to that different lots of powder where a difference of 10% is considered acceptable, a 65 grain load, could easily have that difference with exact same components and conditions.

Doom posted the same while typing

 

[Doom]

It doesn’t really sound right, but mostly it sounds like missing information. Without knowing the bullet, it’s a pointless conversation.

It looks like you’re using the Barnes 130 tsx. Data has a difference of .075”. “Hotter” load being the longer. That would explain the discrepancy.

Add to that different lots of powder where a difference of 10% is considered acceptable, a 65 grain load, could easily have that difference with exact same components and conditions.

Doom posted the same while typing

Thanks for detailing. I was doing this last night but fell asleep at the keyboard! So I just shot the info out first thing.

 

[K22]

I prefer to use published and tested data from the bullet manufacturer since, as others have said, bullets differences can produce significantly different results. I found this to be true both from a pressure and accuracy standpoint.

 

[kenhwind]

Barnes 130 gr. TSX
Alliant, Federal case, Federal 215, COAL 2.79, Reloader 26: 70.3
Barnes, Nosler case, Federal 215, COAL 2,715, RL26: 64.6

These loads are not the same!

 

[Big Mc]

I was looking at to reloading data web sites....Barnes and Alliant.....On max powder charge there is a 6 grain difference between the two....Yet the velocities are about the same...They are both RL 26 powder.....Does that sound right??

Thanks, Bandit

LAWYERS. !!!! TOmmy Mc