6.5x47 lapua load issues

[Savageseven]

hey guys thought i might ask you what you thought was going on here.
im shooting 6,5x 47 lapua with 34 grains of varget and cci450 primers and berger 140 hybrids
.020 off jam. and the firing pin in punching a hole in primer.
no heavy bolt lift or bolt swipe. and the firing pin is .050 protrusion .
so what would be causing this? as most guys run 36.7 - 37.1 grains of varget

 

[4xforfun]

Did it do it with other loads in the past?

 

[Savageseven]

its a new gun to me. just got it in july. guy said it had 300 rounds down the tube

 

[hogpatrol]

Get a borescope and look for a carbon ring. The cheap Teslongs will work.

https://www.amazon.com/s?k=teslong+borescope&ref=nb_sb_noss&tag=accuratescom-20

 

[Pawnee Bill]

Get a borescope and look for a carbon ring. The cheap Teslongs will work.

https://www.amazon.com/s?k=teslong+borescope&ref=nb_sb_noss&tag=accuratescom-20

If you are going to keep the gun have the firing pin bushed also.

 

[Savageseven]

what does having the firing pin bushed do ?? this is a savage action

 

[hpshooter]

what does having the firing pin bushed do ?? this is a savage action

Reduces chance of and or stops pierced primers. Had to do it on my Savage target action in 6.5x47 Lapua with a load of 37.5 grains of RL15 under a 123 Scenar using BR4 primers. Not a raggedly hot load but the original bolt head had a lot of clearance around the standard diameter firing pin.

Did this at 100 rounds with 10 or 15 pierced primers on the action from new, 1400 rounds later same load no pierced primers. Lots of threads on the forum regarding the whys and wherefores of bushing the firing pun and several members here do an excellent job of it. Condition of excessive clearance can happen on most center fire actions regardless of manufacture.

 

[Sixgun]

What are you sizing your brass to? 1.473-1.4735 using the Hornady gauges?

 

[rogn]

Could you have a bad batch of primers? If thats a posibilty firing them in another rifle using them to prove or disprove.

 

[PopCharlie]

I had a similiar problem with my custom Remington 700 in 6.5x47 Lapua. The issue turned out to be loose primer pockets. I was shooting 36 gr. IMR 4451, cci 450s and Berger 140 gr VLDs. I had cratered, backed out primers. I checked the primer pockets with a go-no go gauge. I found them to be loose. I tossed the brass.

PopCharlie

 

[Savageseven]

i was doing load testing and it fired every round as it should with no blown primers till we got to 34 grains of varget.
then it would blow a hole in primer like every third shell. i havent tested anything in the 36 grain of varget yet

 

[Savageseven]

What are you sizing your brass to? 1.473-1.4735 using the Hornady gauges?

using brand new lapua brass

 

[JFrank]

Double check your headspace

 

[CharlieNC]

You can get a replacement bolt head from PTG which has tighter tolerances, fixed the pierced primer on my Savage.

 

[Savageseven]

will do

 

[msalm]

Blanked primers, meaning a perfect disk cutout of the primer (SRP’s) is a firing pin issue. I’ve had to bush multiple bolts because of this. Firing pin is too large (Win 70’s mostly) and too much skip around the firing pin tip in the bolt. Anything over .074ish in fp diameter will cause problems. Have your bolt bushes to under .070” and the firing pin turned/ground down to .001” under or so and you won’t have those issues again. On one Win model 70 I was blanking the small rifle primers on a 6.5x47 Lapua with mild starting loads. Bushed it to .068” and never another problem with it (it was over .080” to start with).

As CharlieNC stated, you could just buy a replacement bolt with a smaller hole and possibly be good too, not sure if they sell them down to .065” or less, but that would be ideal, and turn fp to match.

 

[wedgy]

Grimstood on the forum does Savage bolts and has a very fast turn around time

 

[Savageseven]

Grimstood on the forum does Savage bolts and has a very fast turn around time

thanks wedgy