Peterson pressure 6.5 cm

[il_cop]

Looking for some guidance here....

Tikka 20" 6.5 cm
Peterson brass once fired
143 ELDX .05 jump/ 2.24 cbto/ 2.88 coal
240 rounds down tube
OG 6.5
WLR primers

40 gr h4350
2595 avg.
45 es 15 sd
2577 - 2622

Heavy bolt lift and extractor marks on 1/4 cases

Just keep dropping the charge (?)
Seems super low already but velocity seems to track, though I'm seeing reports of higher charges and velocity here and elsewhere.


Tight chamber?
Is this just what the rifle's gonna give me?

Anything you can think of or recommend?

Appreciate it

 

[wind gypsy]

Extrapolating to my 24.3" CTR barrel, it gets about the same before getting sticky bolt lift.

140 Hybrids to low 2700s, 144 LRHT to around 2670 is about max i can run with Lapua or Norma brass and h4350 without frequent heavy bolt lift. Even that gets a little sticky time to time. So with the 4" of additional barrel length and larger capacity brass, that tracks close to what you're seeing.

I know others push em faster, maybe their tolerance for sticky bolt lift is higher than mine or they just have setups that dont show it as much.

Also, if you were shooting into the wind and it was cool out, i've had bolt thrust issues show up way earlier when shooting suppressed in such conditions.