C h r i s
Well-Known Member
I don't think the problem is with the Sako rifle, its the Hornady ammunition.
Pressure Sign on Factory Hornady Super Performance
- Thread starter Hook'N'Bullet
- Start date
I don't think the problem is with the Sako rifle, its the Hornady ammunition.
If you get those kind of marks with new factory ammo - Its too Hot! If you badly size home loads you can also get them . I should return them to the seller so the batch can be identified , sale of goods act applies " fit for purpose " of course !
Dealers are normally very co-operative in these regards and the UK importers likewise.
As an aside if your home loading it can be created by poor sizing as well as too much powder . Pressure signs do not always have raised primers , ringed or extractor marks on the brass and it could be just a stiff bolt lift and nothing else .
The Brass should be returned with the rest of the fired cases
Dealers are normally very co-operative in these regards and the UK importers likewise.
As an aside if your home loading it can be created by poor sizing as well as too much powder . Pressure signs do not always have raised primers , ringed or extractor marks on the brass and it could be just a stiff bolt lift and nothing else .
The Brass should be returned with the rest of the fired cases
Hook'N'Bullet
Well-Known Member
I did shoot them over a chrony, they are coming out of the muzzle at around 2,880 fps. Superhammerhead were coming out at 2,741 fps.
I didn't chrony the difference between the two boxes of Superformance though as I didn't have then new ones at the time
6.5-06 TIKKA
Well-Known Member
As mentioned before, if you are not happy with the ammunition then return it to the shop you bought it from.
The dealers are usually ok regards this.
The dealers are usually ok regards this.
Hook'N'Bullet
Well-Known Member
ah I bought the box a year ago at this stage - probably not worth the hassle
Not being at the front of the Math class in (prison camp).... read school,
what is the mathematical / % expression for a one in nine slightly smoothed primer event,?
what is the mathematical / % expression for a one in nine slightly smoothed primer event,?
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No, not even close to what i was saying.
2 shot groups are statistically meaningless - you can't look at these 3 targets isolation.
For example, if you overlay group number 1 (spicy rounds the gun doesn't like) with group number 2 (not-spicy) then you end up with a group of 1"ish and a flier, which could have been a pulled shot. Or if you overlay groups 1 and 3 (which I think are both shot with not-spicy rounds) then you end up with a 1-1.5" group - which could actually be worse than the mixed spicy/not-spicy group. Basically, you can interpret those groups in so many different ways and convince yourself they tell you several different outcomes.
To have any certainty you need to a) shoot 5 or 10 shot groups and b) run the rounds through a chrono so you know ES / SD etc.
Hook'N'Bullet
Well-Known Member
Sorry just to clarify:
Group 1 - 2 shots at 9 o clock was not spicy, they are touching each other
Group 2 - Spicy boys and group opened up considerably
Group 3 - Not spicy, small adjustment on windage and they are back touching on the bull
I realize 2 shots is not the norm, but I'm a backyard scientist and in the name of conserving ammo it was adequate for me. I just know one box had some loadings with more recoil, stiff bolt lift, damaged brass and grouped poorly. The other shoots as expected. I'm not scientifically analysing this. It was a post because it peaked my curiosity and thought it might do the same for others
6.5-06 TIKKA
Well-Known Member
If you cannot return the ammunition...then.....
If you can disassemble the ammunition with a kinetic hammer and weigh the powder.
Would let you know the difference and reload with the the components.
Use the load data from manufacturer or lowest disassembled case....
Lot of work I know...
If you can disassemble the ammunition with a kinetic hammer and weigh the powder.
Would let you know the difference and reload with the the components.
Use the load data from manufacturer or lowest disassembled case....
Lot of work I know...
Kinetic hammers, Good chance of losing powder / Kernels .. better to use a collet.
There’s evidence of brass flow on 6 of those cases!
6.5-06 TIKKA
Well-Known Member
Kinetic hammer....wrap in polyethylene bag.
I've done this myself on factory ammunition.
Collet too would work.
Trying to be helpful here.
I've done this myself on factory ammunition.
Collet too would work.
Trying to be helpful here.
C h r i s
Well-Known Member
True, looked like the case at 3 o'clock had more of a flattened primer but could just be the angle of the light.
Is that a crack on the case at 9 o'clock?
Not a crack but there must be a square recess on the opposite side of the bolt to the plunger, probably the recess for the extractor claw, as several other cases are showing the straight line.
Really not good!
Stalker-of-the-deer
Well-Known Member
I had one box in 308 and will never use it again.
It kicks like a mule, it shoots like a shotgun and a sticky bolt.
Had the exact same problem in 243 a few years before and quite clearly didn't learn my lesson!
It kicks like a mule, it shoots like a shotgun and a sticky bolt.
Had the exact same problem in 243 a few years before and quite clearly didn't learn my lesson!
Primers are not a good indicator of pressure unless they have been pierced/blanked (which can also be caused by the firing pin hole being oversize) or if blown out of the case completely.
I suspect the short action(243,308)/223 rounds from Hornady are manufactured so the brass is either at minimum or below SAAMI spec, so they are more friendly to being shot out of semi automatics.
Whilst not 'good' for the brass, shooting it won't hurt your firearm.
I suspect the short action(243,308)/223 rounds from Hornady are manufactured so the brass is either at minimum or below SAAMI spec, so they are more friendly to being shot out of semi automatics.
Whilst not 'good' for the brass, shooting it won't hurt your firearm.
C h r i s
Well-Known Member
Quite right. I'd forgotten how large the recess for the extractor is on the S20.
Attachments
I don’t think the primers are the issue on these, it’s the flow of brass back into the extractor and plunger recesses that are indicating these rounds are definitely over pressure.
I wouldn’t be using any more in my rifle, I’d be taking them back to the shop for a refund
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