Blaser R8. Swapping barrels between stocks. Changes in point of impact/precision ?

[R eight]

Just thought I’d pass on what I’ve observed when switching barrels between stocks on my R8’s .

I’ve got 3 R8’s. Two are the professional model and one is the heavier PH model.

Long story short…when swapping barrels between the professional models there is no difference (none that I can measure) in precision/accuracy or point of impact. I’ve tried that with.22 LR, 223, 308, 30/06 and 9.3 x62.

Today I tried shooting my 9.3 barrel on my PH stock. There was a significant difference in point of impact. 4 inches lower , with the PH stock. at 100 meters. No difference in precision.

I’ve only tried it with the one barrel. At first I was surprised by the difference. But when I think about it it makes sense. But I would never have guessed that it would be 4inches.

Anyway, just thought I’d share. Anyone else got similar experiences ?

 

[Kevin375]

I also had this problem with my R93's.

When my walnut stock started to crack, I decided to fit my .375 H&H mag barrel onto my Professional stock for driven hunt. I had the good idea to check on target if the POI shifted. I was surprised to see my bullets hitting the target much higher.

Very curious, I decided to fit the .300 Winchester magnum onto the walnut stock and this time, the point of impact was much lower.

Later, when I bought a new professional stock, I tried to see if there was still the same problem, but in this case, the POI was the same.

I haven't tried with my R8's so far. However, I know someone who had the same problem between a woodstock and a synthetic stock. He sent a mail to Blaser for complaining but he never received any news. Later, I spoke with a man from Blaser who confirmed me this problem was known.

 

[R eight]

I don’t see it as a problem. Just something to be aware of. When you consider that the PH stock is at least a kilogram heavier than the professional stocks I can see how they would recoil differently and therefore shift point of impact. I was just really surprised that it was 4 inches at 100 meters.

I’ll try the rimfire barrel in the PH stock next visit to the range. My guess is that with almost no recoil there shouldn’t be much, if any, change in the POI. But, I shall see.

 

[Kevin375]

Unfortunately, there are some people who don't know it because many gunsmiths used to say that swapping barrels didn't affect the point of impact.
It's not necessary the case, but it happens.

In my case, both R93's are light but the receiver seems to be not exactly the same between the walnut stock and the synthetic stock. I was told they don't give the same harmonics to the barrel and here is why there is a shift. But I just repeat what I heard.
Keep us informed.

 

[AimSmall]

As with any firearm, after any changes it would best to retest zero before taking afield.

 

[SETH RINGER]

OUR R93'S HAVE ANYWAYS SHOT POA MIX AND MATCH BARRELS AND WALNUT/PRO STOCKS. BOTH STOCKS ARE STANDARD THOUGH.

 

[Rob.450/400]

Today, I tested switching my Blaser 458 Win. Mag. barrel from an R8 Pro Safari stock with steel receiver to an R8 Pro Safari stock with alloy receiver, and there was a change in POI. In the alloy receiver, my group was very high and left. With the steel receiver, I was dead on at 100 meters. Darkness fell, and I was unable to move the barrel back and retest the steel receiver. I will do it later this week.

 

[Quest#1]

I for some reason have an elevation issue just about every time i put my gun together. Im clearly doing something incorrect. Do they have screw sequence? Most recent trip to Mozambique was a disaster. Could be the new z8 was acting weird wouldn’t adjust and then would dramatically. i just stuck it all back in the case and thats where she will sit for a bit.

 

[R eight]

I for some reason have an elevation issue just about every time i put my gun together. Im clearly doing something incorrect. Do they have screw sequence? Most recent trip to Mozambique was a disaster. Could be the new z8 was acting weird wouldn’t adjust and then would dramatically. i just stuck it all back in the case and thats where she will sit for a bit.

First thing I’d check would be the scope mount and scope.
As to screw sequence ? I don’t think they have any recommendations. I just make sure there is absolutely no oil on the bedding blocks and outside of the barrel when assembling. I do have a sequence, but I don’t think it really matters. I always start on the front screw. Screw it using little force. Then rear screw the same way. Then tighten the front and finally the rear. But I don’t think it really matters.

 

[Flbt]

Unfortunately, there are some people who don't know it because many gunsmiths used to say that swapping barrels didn't affect the point of impact.
It's not necessary the case, but it happens.

In my case, both R93's are light but the receiver seems to be not exactly the same between the walnut stock and the synthetic stock. I was told they don't give the same harmonics to the barrel and here is why there is a shift. But I just repeat what I heard.
Keep us informed.

It’s not just that rifle that cause people problems

Honestly my brother and I have sighted 5 rifles in this year because people he worked with could not get them to hit.

Some were bore sights packages from the big Cain store
Some were older rifles that all the screws were lose.
One came in with the barrel and action so lose I really think it was dangerous that the owner tried to sight it in.
Yes I know none of them are the same class rifle.
But if people don’t understand the stock lose from the rifle is bad. I sure a barrel swap did not raise a eyebrow to some.