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Barrel length 308

01 Feb 2019
@ 10:21 pm (GMT)

Magnus Hansson

In the market for a blaser R8, standard length is 58cm (23”) ..what do I loose chosing 52cm (20,5”) in terms terminal performance??

Shorter barrel seems realy nice to live with!!

I’m using SST 150gr, 95% within 150yds!

Thanks Magnus

Replies

02 Feb 2019
@ 09:09 am (GMT)

Mike Davis

Re: Barrel length 308
2 and a bit inches....5 cm thats what you loose(the Mrs might protest but deer shouldnt)
your target is now 5cm further away
velocity wise if you stick with same load you may loose between 25-50 fps per inch so maybe worst case 100fps
real world answer...... unsuppressed it will be louder...you can always dock some off but cant put it back on......if you reload you should be able to regain the lost velocity...unless you are a dedicated bush hobbit why would you bother docking inches anyway????
within 150 yards you say....well velocity diference shouldnt make that much of a diference...heck Im happy to use much slower load within that range,infact will use my 7.62x39mm but will place shots as carefully as I can.
02 Feb 2019
@ 09:45 am (GMT)

Iain

Re: Barrel length 308
Short rifles are indeed easy to live with. Have you actually handled the R8 ? Blasers are shorter than conventional rifles by design and are very compact and nicely balanced with the std barrel length.
Balance with the shorter barrel may be fine, or you may not like it.
A lot of Euro hunting is done from high seats and, particularly if they have a roof, the short barrel can be very good. I believe this may be the main reason for that option being available.
Velocity loss with 150s in 308 in your scenario is likely to be at the bottom end of Mikes' suggestion - maybe as little as 40 to 50fps. I have used Federal 308 150gn factory ammo in both 19.5 and 20.5 barrels and velocity was 2750 in both. This will vary from barrel to barrel.
02 Feb 2019
@ 09:50 am (GMT)

Warwick Marflitt

Re: Barrel length 308
Everything Mike said. Out to 150 y yards knowing what I know now. I'd be looking for a good solid second hand 308. With a long barrel. Shoot it before you buy it. If the end of the barrels rough no worries! Cut it back to the good rifling 21-20 19 1/2 inches . Re-crown zero and use it for freezer fulling duties 1 inch groups at 150yds with partitions 150 or 180gn. Find them and you won't go hungry.
If you know what to look for in a rifle using Nathans book information as a guide there's no reason not to get a good shooter for your requirements. Good hunting.
02 Feb 2019
@ 09:19 pm (GMT)

Magnus Hansson

Re: Barrel length 308
Great answers guys!!

The mrs says hello and agrees about loosing 5cm is a bad thing 😂😂
To the gun, we do a LOT of boar hunting in small hides using supressors, so the Guns tends to become long n in the way ..100% darkness is a guarantee!

Balance wise 52cm with supressor should work!

03 Feb 2019
@ 12:16 am (GMT)

Warwick Marflitt

Re: Barrel length 308
Do you really need a suppressor ?
03 Feb 2019
@ 05:02 am (GMT)

Magnus Hansson

Re: Barrel length 308
It really helps your eyes not seeing the muzzle flash!
03 Feb 2019
@ 10:23 am (GMT)

Iain

Re: Barrel length 308
Here's another option.

https://www.blaser.de/en/products/bolt-action-rifle-r8/r8-models-with-wooden-stock/r8-silence/

Not cheap, but an excellent way to get a suppressor on an R8.

Also notice the barrel length with the factory suppressed R8. 42cm or 47cm

If you prefer to get a suppressor fitted to a standard R8 you could easily chop the barrel shorter than 52cm and still get satisfactory performance.

RWS are now making a 308 load especially for short barrels, but I have no idea of the performance.
25 Jun 2019
@ 06:44 am (GMT)

Magnus Hansson

Re: Barrel length 308
R8 ordered, sent for the 20,5” barrel!!
Fingers crossed the SST’S Will fly 💪💪
25 Jun 2019
@ 08:48 pm (GMT)

Mike R

Re: Barrel length 308
I believe the Hornady Tap 168gr (A max)are made to suit a 20
Inch barrel I get about half MOA with them and they seem very effective on pigs which I was very impressed with, I got some nice sized ones and I couldn’t have wished for better performance.
25 Jun 2019
@ 08:48 pm (GMT)

Mike R

Re: Barrel length 308
I believe the Hornady Tap 168gr (A max)are made to suit a 20
Inch barrel I get about half MOA with them and they seem very effective on pigs which I was very impressed with, I got some nice sized ones and I couldn’t have wished for better performance.
26 Jun 2019
@ 04:23 am (GMT)

Anders Österberg

Re: Barrel length 308
Magnus .

Be sure that your bullrt will leaving the muzzle at least 825m/s !

Asuming you liv in Sweden... the energylimit at 100 meters is 2700joule to reach the big game class 1 level.
27 Jun 2019
@ 06:16 am (GMT)

Magnus Hansson

Re: Barrel length 308
That’s correct

Shouldn’t be a problem, IF the Vihtavouri N140 don’t reach 830 I’ll switch to something faster 💪💪 ..or up the grains to 165 SST


29 Sep 2019
@ 11:01 am (GMT)

Magnus Hansson

Re: Barrel length 308
To round this thread up, the new 20,5 inch R8 is chronoed!

V0 150gr SST (magnetospeed)

VV N140 45,1gr=828 m/sek 2706 fps
Hornady SF factory=879 m/sek 2883 fps

That superformance powder is really something
💪💪💪💪
 

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