Re: Blaser r93 - is it accurate. Did it deserve the \"Rifle of the Century\"
I’ve copied across a couple of posts I made in answer to Torsten’s reloading questions for the R93 that may be of interest(see quote box below).
As regards the qualities of the R93 design itself: The R93 is a really, really neat idea –straight pull bolt, convenience for travel, weight, calibre interchange etc.
As indicated below, I’ve owned 2. A sporter 308 that shot 0.75 and a jagdmatch 243 that shot sub 0.5. But....
They’ve both ended up going back to the factory………
Two major drawbacks:
1. Ask any R93 owner how often his R93 fails to fire.
Compare that to your own experience of ‘conventional’ rifle misfires.
In my experience, Blaser owners seem to put up with misfire rates between 2 and 4%.
(My 1st Blaser took this to 40% due to the fact that the rifle’s chamber had been cut too short!! The 2nd misfired at about 4%. Blaser owners seem to think that 4 out of a hundred is OK [img]/ubbthreads/images/graemlins/shocked.gif[/img]. Interested in a Dangerous game calibre?!! [img]/ubbthreads/images/graemlins/crazy.gif[/img]).
2. [When reading this point bear in mind that the previous point could suggest that they ain't got the design or engineering quite right]
As ds said above,
unlike most conventional rifles, any sort of breech failure is going to put the bolt body through your head –there’s nothing to stop it if the collet fails!
So, whilst R93s may be very accurate, ...........they certainly give you two things to think about each time you pull the trigger [img]/ubbthreads/images/graemlins/cool.gif[/img] [img]/ubbthreads/images/graemlins/confused.gif[/img]!
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I've owned 2 R93s in the last few years and am very familiar with their design (I bought the second to demonstrate that I had a horizontal learning curve following all that went wrong with the first. It had the same problems but to a lesser degree .).
I believe, but would stand correction, that because of the 'collet' style locking mechanism of the bolt head you should reload ammunition for the R93 in the same manner as for a semi-auto; ie; full-length resizing and not just neck-sizing so that your reloaded ammo is always returned to factory dimensions. Because of the nature of the collet's lock up under pressure (it allows the cases to elongate slightly), you will have to pay particular attention to ensuring that the case shoulder is returned to factory dimensions. If you allow the cases to 'grow' the R93 will start to fail to fire due to light primer strikes.
Because of the peculiarity of the R93 bolt head (I can't think of any other design (except maybe the HK G3 etc series of assault rifles) that allows the bolt face to move back slightly whilst the round is fired. The critical length that changes (in the R93) is from case head to shoulder. It is this 'case head to shoulder' length increase that will cause the R93 (again, because of its unique locking system) to start to strike light.
The OAL of the case is not the critical dimension to prevent this (ie trimming the case mouth will not address the problem).
You will need to ensure that you 'bump' the case shoulder back to factory spec.
Bottom line is to return your ammo to factory dimensions; if you just neck size, or fail to bump the shoulder when full length resizing, the R93 will start to light strike your ammo after 2 or 3 reloads
Hope this makes sense!
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