AFA82
New Member
Hello ladies and gents,
I have been playing around with 170gr Lapua Lock Base bullets for a bit recently (in a .308).
My load is 44.5grs of N540 in Lapua cases with cci br2's.
I get 2840fps with minimal variations, in other words its very accurate out to 1200m.
The rifle in question is a Weatherby Vanguard with a 27" Lothar Palma match barrel (1:13 twist)
This load pretty much replicates the HPS factory Lapua ammo.
HOWEVER!
The issue is that I get pressure signs in the form of a sticky bolt, not much but enough to call it a "sticky bolt". With the Factory HPS ammo I never have this.
Since 44.5grs according to the big book is well under max pressure, I am at a lose as to why I'm getting this excessive pressure sign.
I've tried neck sizing and full length re-sizing but same result.
Primers look fine, not pancaked.
Could I just simply have a roughly cut chamber that needs polishing or should I look elsewhere to solve this problem.
I would love to make this combo work since its so accurate to long ranges and I have recently stashed up on 170 LB's and N540.
Many thanks, and if someone could be kind enough to run this load through Quickload I would very much appreciate it.
After shooting these possible over pressure loads, would the rifle still be safe to shoot?
Cheers.
I have been playing around with 170gr Lapua Lock Base bullets for a bit recently (in a .308).
My load is 44.5grs of N540 in Lapua cases with cci br2's.
I get 2840fps with minimal variations, in other words its very accurate out to 1200m.
The rifle in question is a Weatherby Vanguard with a 27" Lothar Palma match barrel (1:13 twist)
This load pretty much replicates the HPS factory Lapua ammo.
HOWEVER!
The issue is that I get pressure signs in the form of a sticky bolt, not much but enough to call it a "sticky bolt". With the Factory HPS ammo I never have this.
Since 44.5grs according to the big book is well under max pressure, I am at a lose as to why I'm getting this excessive pressure sign.
I've tried neck sizing and full length re-sizing but same result.
Primers look fine, not pancaked.
Could I just simply have a roughly cut chamber that needs polishing or should I look elsewhere to solve this problem.
I would love to make this combo work since its so accurate to long ranges and I have recently stashed up on 170 LB's and N540.
Many thanks, and if someone could be kind enough to run this load through Quickload I would very much appreciate it.
After shooting these possible over pressure loads, would the rifle still be safe to shoot?
Cheers.