Originally Posted by Lefty7mmstw
Muddy, I think you've gotta step back a bit more than that on your 7stw if she's sticky. Here's a pressure graph you've seen before from my old sendero 7stw; the win 150 grain load hit over 70 Kpsi peak and she didn't have heavy bolt lift. I'd go 3 to 5 percent down on charge as your pressure should fall twice as fast as the charge drop.
How does one go about measuring chamber pressure? I have always wondered that...All these guys know how much kpsi their loads produce, but I guess I have no idea how they measure that stuff.
I was reading on another thread, and a guy was having the sticky bolt issue with a 300 WM, sounded alot like mine, but he fixed his very quickly and simply, just by backing off the lands a couple thou. He said the bullet on the lands was causing some funky excess pressure spikes and causing his bolt to stick. He said he backed them off a couple thousandths, had his chamber polished, and now he has no issues at all. I guess I'll try his fix to see if it doesn't fix it first. Then I might have to get my chamber polished by my smith. Since it keeps leaving rough drag marks about 1/8" above the belt, even on brass on its second load...Which shouldn't be happening. Obviously I need to have my smith scope the bore anyway. Just want to make sure the throats still in great shape. Should be, since I should only be about 1/2 way theough my barrel's lifespan.
Found out the new (to me) 700 .338 WinMag won't hit the broad side of a barn. Cold-bore, shoots great. Second shot, close. Third shot, God's knows if it's gonna shoot high, low, left, or right, or any combo of those...
Looks like a good candidate for another 7STW...Being it's a Magnum LA receiver.
OR, I'm gonna make it a lightweight .257 Wby Mag for whitetail hunting. Haven't decided...