big difference in load data (berger vs hodgon)

Hildy99

Hildy99

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just comparing load data from berger and hodgon for a 284 win. I emailed berger for data for the 168 VLD and looked at the hodgon site for a 168 Sierra HPBT. I know they are different bullets (hodgon doesn't list the VLD) but why is the charge weight so different as they are the same weight? (powder is H4350) Here is what they said:

BERGER DATA:

H4350

start load: 44gr--2457fps
Max load: 49.1gr--2734fps

HODGON DATA:

H4350

start load: 50gr--2668fps
Max load: 53.5gr (compressed)--2822fps



anyone have an idea as to why bergers max load is lower than hodgons start load?
 
There are a few differences. First, as you mentioned, they are different bullets so may develop significantly different pressures with the same amount of powder. Second thing is that Hodgdon's uses pressure testing to determine their loads. The couple of times I emailed Berger for data they replied that they used Quickload for their data. I haven't gone wrong using the Berger data though, or their bullets :).

Chris.
 
This is the reason why you should never use data for one type of projectile with a different one.

Each manufacturer uses different specs. The thickness of copper jackets on the bullets make a huge difference on measured pressure levels.

I read an interesting article once where the writer had access to pressure testing equipment. He took 150gr pills ffom 8 different manufactures and loaded up 3 of each with the same brass, powder charge and primers (30-06 if my memory is correct). The pressure was measured from 45K to 80K. 60K (if memory serves) is the max pressure for that cal.

Always use load data from the source of the projectiles!
 
work up in .5 grain incraments, Berger uses computer software and no real world test action/rifle, watch your cronograph and have fun.........
 
At best, a manual tells you what worked in their gun. It might be a SAAMI spec test barrel or a average production barrel. Either way, it is not the same as yours. Start low and work up and find what your rifle likes.

When you make your first test, don't make much ammo of each charge weight and be prepared to bring some of it home. Or even almost all of it home.
 
The powder manufacturer has the best handle on lot-to-lot variations and the bullet maker does not want the liability of telling you how much of another company's explosives to use. Plain and simple. You should always use the EXPLOSIVE MANUFACTURER'S DATA
 
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