cratering?

[Jinx-)]

Shot few rounds using CCI 450 primers in light 29.5 gr Varget load in my 6BR, any thought why they look like this?

 

[AaronVan]

how tight is your firing pin to the pin hole?
were there any signs of exceeding pressure?
had the same problem till i put an oversized holland firing pin and spring in my 300 rum.

 

[Jinx-)]

Firing pin, bingo!!! It's like half size of the ejector when engaged.... Wonder why it didn't puncture holes in them... Thanks!

 

[Gene]

Just looking at the width of the craters, I think you need to have the bolt face bushed.

 

[Jinx-)]

Gene, do you think adjusting firing pin won't do it?

 

[Gene]

Well, from the width of the craters, you could have a hard strike, and perhaps some adjustment would help. You need a good smith to measure the FP intrusion and adjust if needed. But, I also recommend having him install a bushing in the bolt face that will allow the FP to glide thru without abraiding on any side.

 

[Jinx-)]

This morning I adjusted firing pin, its Savage after all anyone can be a smith and drove to the rifle range, that was big mistake it was 105 F in the shade, for this place 90 used to happen once or twice in the summer, I have coal stove to keep place warm, but never had a need for AC, but everything changing now... I think because of the temperature outside my loads ran hotter then usual, but here is what primers look like after I adjusted that firing pin, the Norma brass loaded with 29.5 gr Varget and 105 gr A-Max then Lapua brass from 30 gr Varget and 105 A-Max



Looking at the primers they did change from previous what I had...

Do you still think bushing will do me any good?

by the way I switched to CCI BR-4 primers

Thanx

 

[Gene]

You still have very mild cratering, but in the absence of any other pressure signs, I would leave it there. Thumbs up on the BR4's. I use them in everything except my 6BR's. Those only get magnum primers.