Marks on case base on extraction from Ruger 1

[WhelanLad]

I think you have two problems. One is a burr on the breech face that becomes a problem with tight fitting cases, the second is somewhat over-length cases. In the second of your original pics, the last case on the right actually shows three scuffs on the case head. That tells me it's been loaded and fired at least three times.
Your firing pin doesn't strike dead centre in the primer. From what I see the fresh scuff marks on the case are directly in line with the scuff on the primer, and also in line with the part of the FP indent closest to the edge of the primer.
I'm willing to bet your FP "offset" from centre is at the 12 o'clock position. As the action opens the burr drags over the expanded primer and case head, leaving the scuff.

Try loading a round, then ejecting it without firing. Mark it first so you can tell where the 12 o'clock position is. There should be no new marks on it after ejecting unless the case is too long, but I doubt you'll see a scuff on the primer unless your primers are seated above the case head surface.
The firing pin and rebound spring itself is probably fine, the scuff mark looks too wide to be caused by the tip of the pin as I first thought it might be.

You are right to a degree mate, the 3 scrapes may of well been where i have loaded the Chamber for stalking, an not fired the shot! IIRC i may have loaded these PPU/NNY stuff with the 308 Projectiles maybe once or twice, an then these woodleighs were all loaded in the NNY/PPU brass... ive saved the RP stuff as i dont have much & rekon i would get different results loading the same charges an expecting same POI.

im about to go an load a loaded round for you..... result below.

Also the Fellow mentioned the NNY brass is THICK, in the rim, Well my RP brass hasnt got a single mark on it!

but i also havnt Reloaded the RP much more than once or twice!

the result of loaded round is below



Here is prior to loading, i picked a Case with no markings..........

nd here it is once i pulled it out,,,, I had PPU at the top...

I Also loaded a RP, neck sized unprimed into the Chamber, and Not a mark on it, or any of the RP brass............?????


do you now rekon that my Brass is perhaps...too long??? or needs shouder bumped?

 

[WhelanLad]

Biped, i tried to do the primer thing but wouldnt work ,primer was too tight lol

however, i measured the Rim thickness, an i think its Aparent, the NNY RIM is larger.....but noticable margin.................. isnt this itself, my problem? including a slightly over length case? meanin my case is 'shouldered out'/ bottomed out in the chamber, so when the Block closes up it is not able to "move" and thats giving the Brass a shave on the way through??


an i should try find different brass, like RP if i can?

Thanks legends, appreciate this help as always via CGN memebrs!

 

[bigedp51]

WhelanLad

Minimum headspace or the GO gauge is .064 for the .303 British and American NO-GO is .067 and max military is .074.

You need to measure the rim thickness of your Prvi Parizan cases and Remington cases. And from my past experience I doubt the Prvi Partizan rim thickness is over .063 and causing the cases to rub.

I would chamber a new unfired Prvi Parizan case with no bullet seated and see if you get any rub marks.

Question, do you have a good vernier caliper and can you buy a Hornady cartridge case headspace gauge?

I would measure the new cases, once fired cases and the cases with the rub marks and see what the difference is. My gut feeling is the shoulders need to be bumped back .001 or .002.

The problem without using gauges that can measure in thousandths you may push the shoulders back too far. And this could cause case head separations that you do not want.

Below the image shows what happens when you full length resize. And squeezing the diameter of the case makes it "grows" in headspace length and becomes longer than its fired length.

Bottom line, without a accurate gauge measurement from case shoulder to the base of the case you will have to go by feel when closing the action. And also looking for scrape marks on the base of the case.

 

[Lionel]

I get that from my gun, and I thought it was from loading the bullet out too far in the case. My #1 in 303 has a very abrupt leade and I loaded a bunch of cast boolits rather long and that is what happened with my gun.

I have been using PPU cases that are different from my W-W and R-P brass that I use in my Lee Enfield and Ross rifles.