I have two different 62s that are having the same misfire problem - slight dent on first try, then fires on the second try. I am using WLRs and both rifles have new firing pins. I can not see any raised primers after seating. I am thinking that the problem may be my Lee shellholders. I have used the Lee hand primer and my Lyman press to seat primers for both rifles - same results.

What shellholders and primer seating systems are y'all using? I have this posted on the Medium Bores Forum as well.

I use an RCBS hand primer and Federal Primers. I've never had a single mis-fire with any of my 3 9,3x62's.
Have you checked the headspace on this rifle? It's possible that the shell is chambering too far forwards and the firing pin is driving the case forward. Does the problem only happen with new brass or with reloads also?.....................DJ

Are you using the same 9.3x62 brass for both guns?? Measure the depth of the primer pockets on cases that displayed the misfire and ones that did not. Is the brass new or fired multiple times. How do the primers seat, are the pockets still reasonably tight?? Make sure you mark the brass exhibiting the problem, and see if (when reloaded) the problem reoccurs.

I use the Lee Autoprime to prime Lapua brass with CCI 200 - I have not had a problem thus far.

- mike

On my 9.3 X 62 I resized my new brass and my die locking ring moved. I had a brass headspace problem. Had to fireform brass with a false shoulder then set dies correctly.

I have had the problem with both Graf and Lapua virgin and once fired brass. Primer pockets are still tight.

mho, what Lee shellholder are you using?

One rifle is a Heym and does have a slight headspace problem, so I fireform the brass I use in it. The other is a custom on a Model 70 and has no headspace issues. Both rifles have new firing pin springs.

I have had no problems either. I use Grafs brass, CCI primers & the RCBS hand priming tool

Are you uniforming the primer pockets and, if so, what tool are you using? Can you check the pocket depth?

The RCBS uniforming tool can be self-adjusting, and not all tools have a depth stop.

If you are over-sizing the brass, the rifles don't have to have head-spacing problems. What lock rings are you using? Lees can be self-adjusting.

I am not uniforming the pockets. I'm using Redding dies and am adjusting for full length resize just as I do many other calibers (per Redding directions). I guess it's possible that the dies are the problem - i.e. pushing the shoulder too far back when adjusted normally.

I don't have a way (that I know of) to measure the depths, but find it strange that both Grafs and Lapua brass would be problematic. Does anybody else think it could be the shellholders?

I'd suggest that you clean the primer pockets with a small flat blade screw driver or a tool made for that purpose before you reprime.

I'd check my bolt and make certain that it is clean and there is no junk inside the bolt.

Rather than full length resize, adjust it to neck size plus a bump.

Since you are reloading for two rifles, I'd set my die to resize the brass for the tighter of the two chambers then test those loads in the looser chamber to make certain they fire. If they don't you will have to segregate brass and load for each one separately.

Kudude

You may be better served by partial full-length sizing. Screw the die into the press only far enough that the brass chambers in your rifles. Sizing beyond that point creates additional headspace. The Redding Competition Shellholder Set is designed to make the process simple and repeatable, but is probably not necessary to your purpose unless you wish to fit brass individually for each rifle.

I try to avoid saying very much positive regarding Lee products, but I doubt that the shellholder is culpable unless it is a modified piece acquired used.

I have loaded 9,3x62 in Sako brass, CCI200 primer, Dillon 550 press with 308 Win shell plate, no problems.