I built a 7mm 338 Papua imp. I fireformed brass over 2 yrs hunting with 104 gns of wc872 175 gameking in lands. They shot great. Killing several deer. Now I'm loading up my first loads with formed bUrass and getting lots of pressure very sticky bolt. Can't hardly open. People that I read about was going up to 110 gn I started at 104 what I formed with even went down and still have pressure. So I backed off lands .025 and down 1gn n still pressure. Having to trash alot of brass cause the case won't go in shell holder. Please help.
7mm 338 lapua imp pressure problem
- Thread starter joe30007
- Start date
Re: 7mm 338 lapua imp pressure problem
WC872 is the slowest powder known to man.
Simply back down the charge. WC872 also varies lot to lot in burn rate.
WC872 is the slowest powder known to man.
Simply back down the charge. WC872 also varies lot to lot in burn rate.
Re: 7mm 338 lapua imp pressure problem
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">WC872 is the slowest powder known to man.</div></div>
Yep, certainly not a powder speed issue.
Back down to about 98gr and work up from there. A friend of mine has the same thing and he's getting pressure at about 99.5-100gr of Retumbo, at 104gr of WC872 I'm a little surprised but if you tried 110gr of it I'm not surprised you got pressure.
Might also try the 189 Cuateruccio bullets too. They have nice thick jackets like the 175 SMK does but with a bunch of BC on them and it's a little more suited to the behemoth of a case you have there.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">WC872 is the slowest powder known to man.</div></div>
Yep, certainly not a powder speed issue.
Back down to about 98gr and work up from there. A friend of mine has the same thing and he's getting pressure at about 99.5-100gr of Retumbo, at 104gr of WC872 I'm a little surprised but if you tried 110gr of it I'm not surprised you got pressure.
Might also try the 189 Cuateruccio bullets too. They have nice thick jackets like the 175 SMK does but with a bunch of BC on them and it's a little more suited to the behemoth of a case you have there.
