Please confirm my data

[Texas Solo]

I've been shooting 80gr Berger VLD's in my .223 Wylde chamber with 24.5gr Varget.
That's 1/2gr under max with excellent results.
Now I want to try the 82gr Berger BT Match because of the different ogive it has.

Here's the question: Hodgdon site shows 25.0 max Varget with the 80gr VLD's.
It shows only 21.5 max for the 82gr. ??????????????????

I don't understand how 2 more grains of bullet can make that big a difference in the max load data.

No, I won't be attempting max, that's not my intent. But when comparing datas, it's just useful to compare the max loads to see how they compare.

Other websites don't even list the 82gr bullet, nor do my Sierra or Lyman manuals.
Can someone please look this stuff up and tell me what you find for the 82gr Berger and Varget??

Thanks much.

 

[ALBULLET]

All components are not the same. Being safe is number ONE priority at all times. The two bullets you have mentioned are different. Some books list twist, barrel length, barrel diameter and even action used. All these different components will result in different results in speed and pressure. Your book is normal. We have all seen this before when trying to compare grapes to raisins ... Apples and oranges too much.
The book you use to load your ammo is for all guns. Not just your gun. Look at the pressure listed for the loads in your book. Pick a spot below the pressure limit of ur gun and start there. Good luck... But to try something else you must presently not be satisfied with what you are currently getting.

 

[Zero333]

The 80grVLD has less bearing surface then the 82grBT. That extra bearing surface along with 2 more grains raises the pressure.

Hodgdon's data shows a coal of 2.55" for the 80vld and 2.375" for the 82 bt. (the 82gr bt is .185" deeper inside the case according to Quickload)
Seating a bullet deeper in the case raises pressures.

More weight + longer bearing surface + deeper inside the case = more + more + more pressure.

Work up to 22gr of varget and if you don't have any pressure signs before 22gr, keep going up in small increments paying close attention to pressure signs.

Hodgdon tested these loads with Winchester brass which has a lil more internal capacity than Lapua brass and even more capacity than LC/FC brass.

Even if you use the same components, same firearm, same COAL, and same lot of powder, it doesn't mean the pressure will be the same. Could be more or less.

Work up and be safe.

Quickload prediction...

223 Rem.
H2O case capacity 28.8gr
82 Berger BT.
2.375" coal.
23gr Varget
106% case fill
58,088 psi.

 

[Texas Solo]

I get it. I was only looking at bullet weight, not bearing surface.
I know about seating depth (oal) etc etc. My OAL is longer than book @ 2.600, a product of reaching the lands with a Wylde chamber. I'm trying this bullet because of the tangent ogive. The secant ogive on the VLD, when seated to reach the lands, leaves me only a tiny bit of bullet in the case. This 82gr bullet measures much better in my chamber.
Thanks

 

[waldo1979]

You might need a faster/slower powder with the less case capacity. Haven't tried 82gr VLDs yet only 80gr.

 

[L1986]

Comparing the hodgdon data to the Berger data this is what I see. Berger does not list varget for either bullet you listed. The heaviest bullet the have varget listed for is the 77 OTM bullet and the max charge is 22.5g. Now looking at hodgdon data I see the 80g bullet being a Sierra MK. If this is the same data you have I would guess the difference is in the match king verses the Berger VLD. Same weight bullet but much difference in size and shape.