Normally in magnums you’ll have a slight primer flattening you can only see after punching the primer before your bolt lift is pressured! That is a good notification you are getting close, but you can’t see it unless you punch the primer. If you can see the primer flattened or protruding crater on the primer before you punch it you normally already have a slight restriction on bolt lift! Just what I have foundI’m trying to identify pressure signs and I think I have too many variables in the mix.
The easiest sign to identify seems to be bolt lift. A heavy bolt is hard to not identify. The question is whether a heavy bolt lift is a pressure sign or something else? What causes heavy bolt lift? I assume it’s the case expanding at the shoulders and the shoulder rubbing as it’s rotated to free the bolt when the handle is lifted? If this is true, it has to be a relative amount because all cases expand, so some expansion is ok and the bolt doesn’t get heavy, but excessive Pressure causes excessive expansion which causes heavy bolt lift?
Last night i shot virgin h1000 and 1x reloaded rl26 out of my 7 Saum. I was trying to find pressure and got a stiff bolt immediately from the 1x fired rl26. I had bumped the shoulders back .002-.003 and the bolt closed easily on the loaded rounds. I find it hard to believe I was hitting pressure already but the bolts were noticeably stiff (starting load 59.1gr and 2576fps out of a 20” barrel.
On my last round of h1000 I got a stiff bolt but no other signs of pressure. I just measured the shoulder and it was longer than the other virgin h1000 shoulders that I fired last night by .002”. So I assume I hit pressure there? That was with 64.6gr h1000 in adg brass with a 180eldm out of a 7saum. No ejector smear, no flat primer. A little mark where the cutout on the bolt face where the extractor is.
I never saw any extractor smears or flat primers or cratering on any brass h1000 or rl26. Just variations in bolt lift.
Im not even sure what help I’m asking for…I’m just confused! I am FL sizing and shoulder bumping, but am I doing something wrong on the 1x fired brass to cause the bolt lift? Should I ignore bolt lift and keep an eye out for primer/ejector signs?
Here are a couple of pictures. Not sure if they’ll help.
the gun shoots great, just trying to get into the 2700-2750fps range. The ladder test was 625 yards. The wind shifted from north to south at the end of the h1000 which explains the last 3 hitting far left.
I got out of order on the h1000 at the end as you can see on my note pad. Smh