So, uh, it turns out that decimal places matter...

[BurnOut]

I have been having a problem with one of my rifles (Tikka T3) not being able to reliably fire ammo that I reloaded. I've been cussing at this thing off and on for a few months now, disassembling the bolt, polishing the firing pin, etc...

None of it seemed to work.

So this morning I decided to take a closer look at the ammo that I loaded... it seems that instead of pushing the case shoulder back .002", I had my full length resizing die set to push it back .020"... NO FUCKING WONDER I had unreliable ignition... the whole cartridge was able to basically "run away" from the fucking firing pin for .020".

​

So, I guess the moral of the story is, pay attention to WTF you're doing at the loading bench....

 

[Forward543]

.020" is pushing excessive headspace by a bit. Glad you caught it and shared. Never hurts to be reminded. Probably means your rifle was chambered .020 over or your dies are .020 under. You might verify either way. I like .001-.002 for bolt and .002-.004 for gas.

 

[patriot07]

Good reminder for sure. Happens to the best of us. There is so much math in the reloading game that I'm surprised we don't run into issues more often.

 

[BurnOut]

.020" is pushing excessive headspace by a bit. Glad you caught it and shared. Never hurts to be reminded. Probably means your rifle was chambered .020 over or your dies are .020 under. You might verify either way. I like .001-.002 for bolt and .002-.004 for gas.

I'm 99.999% sure that headspace in the rifle is fine... I came up with the .020" number by checking the base-to-shoulder measurement (with the Hornady headspace comparator set) of case that managed to fire in my rifle vs. a loaded (by me) round. I then compared several other fired cases to other unfired rounds and got the same results.

Pure boneheadedness on my part adjusting the FL die.

 

[supercorndogs]

I trashed about 700 pieces of LC 223 brass like this.

 

[bax]

I tossed half a box of Lapua doing something similar. This is why handloaders need to have OCD. Check and double-check.

 

[918v]

What fl die bumps the shoulder .020”?????

 

[Bender]

What fl die bumps the shoulder .020”?????

This?

 

[Diver160651]

What fl die bumps the shoulder .020”?????

Op ^

Check everything now, headspace your own measurements, etc..

Make sure you mark your brass because if you fired it, it will certainly start to have a premature thin spot about an .124-.25 inch up from the inside of the base causing case head separation.

If it’s hard or brass like Lapua, it may now die in just a few firings. While you can look for signs outside the brass, you should make a tool and look for a ridge inside the case by feel. It will save you some grief and shows up before the outside starts looking like the images to the right.

 

[lash]

You will likely get early case head separation on this brass that you headspaced this much. You should seriously consider trashing any brass you sized this way and replacing it.

 

[BurnOut]

What fl die bumps the shoulder .020”?????

One that's seriously misadjusted? Using the Hornady comparator set, I'm measuring fired cases at 1.550-1.551 (base-to-shoulder) while previously resized/reloaded cases are showing 1.528-1.529 for the same measurement.

Fortunately, the brass is nothing special... once-fired (in my gun) Fiocchi in .204 Ruger. I have around 150 pieces that I've cleaned but haven't yet resized, so I should be in good shape. I just need to recover the powder and projectiles from my remaining loaded rounds and I should be in good shape.

 

[TheGerman]

People don't think decimal places be like it is, but it do.

 

[lash]

I’d like to say that I’ve never made mistakes while loading, but I would be lying. I once ruined three or four Lapua .338 LM cases while decapping because I didn’t check to make sure that they didn’t contact the necks. Rolled those neck right over big time because I was distracted for the first few cases. Felt like an idiot.

 

[Bradu]

I’d like to say that I’ve never made mistakes while loading, but I would be lying. I once ruins three or four Lapua .338 LM cases while decapping because I didn’t check to make sure that they didn’t contact the necks. Rolled those neck right over big time because I was distracted for the first few cases. Felt like an idiot.

I think we have all made mistakes reloading. Luckily, I think my worst mistake was having a couple rounds that I forgot to prime. I dropped powder and seated a bullet only to figure out that it wouldn't chamber worth a fuck because of the powder that was between the bolt face and cartridge.

 

[Dirty8404]

 

[918v]

One that's seriously misadjusted? Using the Hornady comparator set, I'm measuring fired cases at 1.550-1.551 (base-to-shoulder) while previously resized/reloaded cases are showing 1.528-1.529 for the same measurement.

Fortunately, the brass is nothing special... once-fired (in my gun) Fiocchi in .204 Ruger. I have around 150 pieces that I've cleaned but haven't yet resized, so I should be in good shape. I just need to recover the powder and projectiles from my remaining loaded rounds and I should be in good shape.

My shallowest die bumps the shoulder .006” if I cam over.

.020” is a lot.

 

[BurnOut]

Well, intermittent "light strike" fix proven out... didn't have a single failed ignition today.

While I feel like a bonehead for causing the problem, I'm sure glad I finally figured it out.

 

[eklarsen]

Preach brother... I've been there.

 

[mdmp5]

My shallowest die bumps the shoulder .006” if I cam over.

.020” is a lot.

I was thinking he’d need to shorten the die to get it to push the shoulder back 20 thou. That’s an inordinate amount of headspace

 

[trob_205]

Must have a stout AF bench the press is attached to. Might want to recheck mounting bolts if you got it to cam over and move that much.

 

[supercorndogs]

What fl die bumps the shoulder .020”?????

I have a Lyman die that got damn close.

 

[FLIGHT762]

What fl die bumps the shoulder .020”?????

I trimmed a bunch of 222 Remington using a Dillon RT1200 with the Dillon 222 Rem. trim die. That fucking die pushed the shoulders so far back, I got case head separations on the first shot. I scrapped a hundred or so 222 cases. So pissed off.

 

[BurnOut]

So, after reading some feedback from some of y'all, I decided to do some more investigating into what may have been the cause of my extreme shoulder bump. Not surprisingly, you guys were correct in concluding that the FL resizing die cannot be adjusted to bump the shoulder back that far. It turns out that the culprit was my Lee factory crimp die (sort of... read on).

Due to a lack of understanding regarding how the FCD actually works, I shamefully admit to shortening mine... which led to the extreme shoulder bump. I thought (for some reason) that the FCD worked off of the case shoulder to actuate the crimping functionality, but that's not how it works; it works off the shell holder. When I first got the FCD and was adjusting it, I noticed that it was contacting the shell plate prior to giving any significant crimp (duh), so I shortened the die in order to let the shoulder of the case actuate the crimping function "like it should". Jackassery ensued.

So, to make a short story long, I'm still the cause of the problem, but the mechanism that I used to actually cause the problem has been positively identified. It turns out that I'm certainly a bonehead, and fortunately, the only thing it cost me was the price of a new FCD and ~150 pieces of once-fired brass.

 

[lash]

Thanks for owning up and letting us know what your issue turned out to be. It’s possible that it could help someone else later.

 

[FishDr]

So, after reading some feedback from some of y'all, I decided to do some more investigating into what may have been the cause of my extreme shoulder bump. Not surprisingly, you guys were correct in concluding that the FL resizing die cannot be adjusted to bump the shoulder back that far. It turns out that the culprit was my Lee factory crimp die (sort of... read on).

Due to a lack of understanding regarding how the FCD actually works, I shamefully admit to shortening mine... which led to the extreme shoulder bump. I thought (for some reason) that the FCD worked off of the case shoulder to actuate the crimping functionality, but that's not how it works; it works off the shell holder. When I first got the FCD and was adjusting it, I noticed that it was contacting the shell plate prior to giving any significant crimp (duh), so I shortened the die in order to let the shoulder of the case actuate the crimping function "like it should". Jackassery ensued.

So, to make a short story long, I'm still the cause of the problem, but the mechanism that I used to actually cause the problem has been positively identified. It turns out that I'm certainly a bonehead, and fortunately, the only thing it cost me was the price of a new FCD and ~150 pieces of once-fired brass.

Thanks so much for taking the time to investigate and share the information. This type of comms is what the site is all about. I’ve made several reloading mistakes - thankfully non were catastrophic. Just replace some pieces for stupidity.
Love my Dillon presses - but graduating to a progressive press was a steep learning curve for me.
Thanks again for sharing.

 

[JimLee]

I keep this on my bench, as a reminder to not be a dumbass. Doesn't always work. That is all.