Sierra .308 165 grain HPBT

[Jeffo]

Going to load some of the above to try out with Vit N140 any advice regarding a starting load and max,was thinking of starting at 42.0 grains

 

[Dr. Strangelove]

This is from the Viht app:



Although not a Sierra it’s perhaps a good place to start.

 

[Humpy]

You will probably get your best groups at the 42 grain area. Are you familiar with step loading?

 

[Jeffo]

No never heard of step loading, can you explain

 

[Humpy]

Already done. See thread Load Development How do you do yours? thread.

 

[Jeffo]

Will have a look as I normally do either a ladder test or ocw
Thanks

 

[antsa]

When I lived in Europe and had access to Vihtavuori powders I used N140 under the Sierra 165gr HPBT. Always shot around .25MOA at 100m off the bench with my Sako 85 Hunter with a 570mm, 1:11" barrel. My load was 43.9gr, Norma brass and CCI200 primers. Used them for wild boar, fallow and moose.

Cheers

 

[Caesium]

I've got these Sierra heads and I use N540 at 41gr. Certainly got some go to them and nice and accurate through a TAC A1

 

[Miki]

Bullets, did you mean @Caesium ?

I put your load into GRT and am slightly confused .. the max pressure was well below PMax-25% @ 43100psi and the bullets MV was around 2490fps and only a 92% powder burn ?
What made you settle on this load ?

 

[Caesium]

Never used that tool, I use what gets me the most accurate grouping at my range. I'm not that far into my reloading journey to be as scientific as using a tool, I only use the bullet manufacturers load data.

My RFD recommended the powder as I couldn't get N140

 

[big ears]

Sierra app gives 38.8-44.3gr
COAL 2.750”

BE

 

[Jeffo]

Thanks for all your input

 

[eldon]

My usual 308 load in a Remington is 44.5grs N140 behind a Sierra 2140 at a col of 2.820"