155gr for .308 win

[gsg5pk]

What is the standard seatdepth for 155gr projectile?

Example ;

155 AMAX
155 Palma (2156)
155.5 Fullbore

Shorter that 168 SMK ?

 

[Martin52]

No standard but as a guide you will probably hear that the Berger FB 155.5 and the Sierra 2156 generally perform well when seated off the lands, in my case I seat 40 thou off - saw my groups tighten up once I got past 25 thou. This is for palma shooting, 30 inch barrel 1:12 twist.

Martin

 

[NateG]

The 155 Hybrids shot best for me (in two different barrels so far) at a jump of .030"**, but they shoot well from .015" onward, so I've been setting them at .015" when the barrel's new, and leaving it alone from then on.

The 2156s seemed to shoot best at a bit more jump, .040"** or so. They also shot well with ammo loaded for a 2011 fullbore chamber in a 95 Palma chamber (which meant a good bit more than the .040" jump in the other chamber).

I'd have to see if I can find my seating depth when I shot the 155 Scenars, but I think it was probably a jump of about .020". I didn't have to mess with them much; they shot well with my initial loads.

I'm shooting them sling-and-irons, so my ability to discern the accuracy of the loads isn't that of a top F/TR shooter, but I've had strings good enough that I'm pretty confident that those loads shoot well in my guns.

**I got the impression from the forums that these were pretty common jumps for these bullets, and my experience lined up with what I've read here and elsewhere.