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Discussion Starter #1
Would like to hear of results, good or bad, of seating depth from lands using the Hornady 178 grain HPBT projectiles.

Please include powder, primer, brass, and barrel length used as well.

Thank you.
 

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didn't find any 178 bthp but here is what I found for what its worth.. savage model 11 Lrh 300 wsm..
powder was H380
fed 215 primers
fed and rem brass
hornady 168 bthp coal of 2.855 to lands, load at 2.830" 63 gr h380 (.192 moa at 300 yards)
168 amax coal of 2880 to lands, load at 2.830" 63 h380 (never shot enough of these to settle on anything accurate)
178 bthp not available
178 amax coal of 2.870 to lands, load at 2.825" 61.3 h380 (.439moa at 300 yards) next node at 63.1 ish ) 63.1 was too hot in my rifle but accurate.. these were run on Dan newbarrys OCW and he confirmed these were the nodes for h380 and 178
worked in my rifle, hope its some help
 

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I found that when I started treating the 178 gr A-Max as if it was a VLD my results improved. I find that in my rifle I get great results with 42.2 gr of IMR 4064, Lapua Brass, Tula Primer, and a "Jump" of .040". Also does real well at "Magazine Length" (or just a little longer) of 2.820".

Take some time and read this:

VLD: Making it Shoot | Berger Bullets

The A-Max, unlike the popular SMK's has a secant ogive just like the VLD's. Lots of people have problems making the secant ogive bullets perform because the want to treat them the same as the tangent ogive bullets such as the SMK. Like the author says, time to think outside the box. Worked for me.
 

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Discussion Starter #4 (Edited)
Thank you all for responding.
I did read VLD: Making it Shoot | Berger Bullets and intend to utilize the method once charge is established. I was hoping to see sort of a pattern emerge from the responses given.
I did an OCW with 41.4-42.2 grain IMR 4064 @ 0.035 jump giving me the best group (.295) at 42.0 grains. 41.8 and 42.2 were slightly larger.

DD2, what was your velocity with the 42.2 load? I do not have a chronograph, used to be able to shoot out to 600 yards and match the comeups with Hornady's online ballistic calculator to get my velocity.

I will be able to shoot Sunday and have another go at a load. Looking for a lower node. Once I get the powder charge I will start with the seating.
 

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Discussion Starter #6 (Edited)
Thank you for that information; that correlates closely with the 42.0 load shot @ .35 off the lands. Our estimated velocity was 2600 for original "comeups" , but when shot to 600 yards it required adjustment that yielded corrections for 2700+ velocity.
This was shot through a new (less than 50 rounds) Bartlein 1:10, 5r, 24" barrel at sea level, ambient temperature 85.
We are looking to hit a lower velocity node in the 2500-2600 range.
 

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I load my 178 BTHP and AMAX .020" off the lands with 44grns of Varget in a Hornady case which gives me 2690fps from my 20" barrel.
 

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Discussion Starter #10
Rob01,

I am loading the 178s into Lapua brass and using WLR primers with the 42.0 grains of IMR 4064.
I have not seen Varget here for about 3 years.
 

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Discussion Starter #11
Shot 3 strings today at different settings. 41.0 grains at 0.010 off lands gave me a 0.158 3 round group with the 178 Hornady HPBT. The 41.9 3 round group was 0.218 with a 175 Nosler CC .090 off lands. Shot at Ukumehame range.
Lapua FL sized brass, IMR 4064 and WLR primers. The BTO is in the COL space.
I will load up 10 of each to verify at my next range day, August frickin 30th. I miss living in a free state.

IMGP0009.JPG IMGP0008.JPG
 

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Disclaimer first.. I’m new to reloading. I just started reloading the Hornady 178 BTHP 308s because of the .530 bc. I shot a group of 5 with 41grains of accurate 2495. Backed the bullet .021 off the lands and 4 out of 5 hit 2” low but inside a [email protected] 42grains brought it up dead ctr. I know it’s only 100yds but that’s what I’ve got to work with in SW Michigan 😉 fed 210 primers
29028

This isn’t the five shot group, I was working up a powder load. I need a chronograph.
 

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I should get a commission for doing this but, Here's the link for a great article on load development done right. I've been reloading for a few years now and I re-read the article every once and a while.

 
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