It doesn't mean the die is good or bad. It would mean the relationship between that die and that chamber simply doesn't allow for sufficient sizing is all. Nothing "wrong" with either, just a poor fit of the two together. It's a fine line between just right and not enough sizing and everything has tolerances. Measure as best you can, the largest area ahead of the extractor groove with a good micrometer, not calipers. You need a minimum of about .0005(tenths), sized vs fired. Sized being smaller of course.
6BRA Heavy bolt lift
- Thread starter Rehner23
- Start date
Just the 2nd firing on the brass, the first being fire forming.
I’ve bumped the shoulder .002” and .005” with no difference in lift effort.
2nd firing on the brass.
I don’t know what a 200 line is!
That rules out length, which is rarely the problem with heavy lift anyway. It shows up on closure. Bumping the shoulders back more has very little effect on diameter. If a case has .010 TPI(taper per inch) you'd have to bump them .100 to gain .001 in diameter. You can do the math and see how little difference it makes to diameter.
The Wilson Br-a fl die as per their tech is based off the JGS wheeler #1 reamer, I took a couple notes when I got mine.
.200 sizing .468
CSJ sizing .458
I had mine honed slightly and now I get .469 at the .200 line, I’ve also shaved the shell holder about .005 . I don’t normally have pressure issues unless I get lazy and leave excess lube somewhere.
.200 sizing .468
CSJ sizing .458
I had mine honed slightly and now I get .469 at the .200 line, I’ve also shaved the shell holder about .005 . I don’t normally have pressure issues unless I get lazy and leave excess lube somewhere.
rwj
Gold $$ Contributor
Axial offset of .200 inches from the case primer face moving towards the neck. This location coincides with where the chamber begins to support the case. This offset dimension is cited on many SAAMI chamber drawings.
It's just a reference point...industry standard spot.
I don’t, I haven’t asked the gun smith that chambered it yet.
My .200 line is sized .0015” smaller than on a fired case.
That's quite a bit and should rule that out too.
Ink up a fired and a sized piece of brass and see where it's tight.
Ok, put up with a couple stupid questions...does resized, unloaded brass cycle fine? Does a loaded round cycle fine? Is there a light load that you can try to make sure it's a pressure problem? Have you closely inspected the chamber/neck of your barrel (with borescope)to look for a rough chamber/ wall? I clean my chamber with a bore mop and 99% isopropyl everytime I clean, might try that....and, as stated above, make sure to grease your lugs....rsbhunter
Mark W
Gold $$ Contributor
I’ve had a similar problem twice since I’ve been reloading. The first time was caused by solvent left in the bore from cleaning and the second time was caused by insufficient neck clearance.
Now I always swab a bore with a clean patch and isopropyl alcohol before I take a gun out to shoot. I also check to make sure that a new bullet fits into a fired case neck.
Now I always swab a bore with a clean patch and isopropyl alcohol before I take a gun out to shoot. I also check to make sure that a new bullet fits into a fired case neck.
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Yes, definitely check bullet fit in a fired case to make sure it slips in easily. Had a 243 LBC ar that was showing slight pressure at mid level loads...at a match I tried slipping a loaded rounds bullet into a empty case. Would not go ... ended up turning necks from .015 down to .011 ! Might be a good thing to look at...rsbhunter
Why do you think neck clearance could cause difficult bolt turn?
Mark W
Gold $$ Contributor
Lack of sufficient neck clearance will cause a high pressure situation that is accompanied by all of the classic signs of high pressure including heavy bolt lift, flattened primers, smears on the case head, blanked primers….etc.
If the bullet "release" is restricted, pressure also rises in the case. At the speed that the pressure rises, any restriction can cause a spike in the pressure curve, causing resulting pressure increase in the case. Same principle of having light bullet/neck tension vs a crimped neck. Why most top level shooters try to keep neck tension so consistent. rsbhunter
TylerFromMS
Gold $$ Contributor
Color a fired case with a sharpie or dykem and run it in your sizing die. I’d be willing to bet the case is not being fully sized or sized only on one side. We just had a guy go through this same situation with Lapua and Peterson brass and a LE Wilson die. Modified AW1 reamer. I recommend Harrels.
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