8x57 JRS 220gn RN Woodleigh

Moderator: deerhunter338mag

Post Reply
secondtry
Meister der jagd
Posts: 1208
Joined: Fri Nov 23, 2012 8:22 pm
Location: Victoria Australia

8x57 JRS 220gn RN Woodleigh

Post by secondtry » Wed Dec 20, 2017 9:26 pm

(Cartridge) 8x57 JRS

(Brand of bullet) Woodleigh RN

(Weight of bullet) 220gn

(Brand of brass) Norma

(Type of powder) ADI AR2209/H4350

(Grains of powder) 56.5

(Brand, and type of primer) Fed 210 GM

(COAL) 3.195"

(CBTO)

(FPS/MPS) 2440fps

(Rifle) K 95

(Barrel Length) 52cm

(Scope) 1.5/6x42 Zeiss HT

(Weather conditions & temp) Clear, no wind 15/20C

(Accuracy @ 100 yards) 1.37"

(Notes)
Haven't finished with this one yet. Loading in .5 gn increments, groups have been very slightly, but consistently closing up, up to this point. I tried 57gn today and the first two were in .69" and looking like the third would form a nice little Blaser triangle, but the third blew it out.

I have now retried 57g and although group size is fractionally smaller than 56.5, the difference is not significant and could simply be normal variations. Also I am not liking the degree of compression needed with 57g in new brass, so 56.5 it will be.

I am not concerned that 56.5 has proved to be the best. 2209/H4350 definitely is giving me more speed than 2208, although I don't think it is the nicest choice with these components and my short barrel. I also don't have much bullet in the case neck, and these two things would not be helping accuracy. I'd like to see 3 in 1", but for sambar at under 100yds, 1.37" is plenty good enough. I am sure that Varget/2208 would be more accurate, but for this application I would much rather have another 100fps than reduce 100yd group sizes by maybe .5"

POI is dead in line with my 200NP load and maybe .25" to .5" lower, so the two loads are interchangeable, which is nice.
Last edited by secondtry on Thu Jan 11, 2018 4:42 am, edited 2 times in total.



secondtry
Meister der jagd
Posts: 1208
Joined: Fri Nov 23, 2012 8:22 pm
Location: Victoria Australia

Re: 8x57 JRS 220gn RN Woodleigh

Post by secondtry » Thu Jan 11, 2018 4:38 am

I've had another range session with this one and edited and tidied up the original post. :)

User avatar
mchughcb
Moderator
Posts: 8802
Joined: Tue Aug 25, 2009 2:55 am
Location: Melbourne Australia

Re: 8x57 JRS 220gn RN Woodleigh

Post by mchughcb » Thu Jan 11, 2018 4:54 am

Excellent work. Im waiting until we see the game performance now.

User avatar
mchughcb
Moderator
Posts: 8802
Joined: Tue Aug 25, 2009 2:55 am
Location: Melbourne Australia

Re: 8x57 JRS 220gn RN Woodleigh

Post by mchughcb » Thu Jan 11, 2018 7:19 am

I just checked my woodleigh book and you are well over max load. How does the pressure signs look?

secondtry
Meister der jagd
Posts: 1208
Joined: Fri Nov 23, 2012 8:22 pm
Location: Victoria Australia

Re: 8x57 JRS 220gn RN Woodleigh

Post by secondtry » Thu Jan 11, 2018 11:29 pm

mchughcb wrote:I just checked my woodleigh book and you are well over max load. How does the pressure signs look?
Primers are top hatting a little, but that is usual with these primers in full power loads in other rifles I have used them in. If anything the top hatting in this load is less than in some others. I haven't bothered to mike case heads, and I don't think it is overly hot. Fired cases drop easily and completely into the unmounted barrel.

What does Woodleigh call max ? I'll check it to my load development notes.
mchughcb wrote:Excellent work. Im waiting until we see the game performance now.
Me too. The K95 gets used mainly in (very) poor light and often at ranges over 100yds. The 8x57barrel has only a 1.5/6x 42, which is not ideal for those conditions, so I will need to either sight in another scope or spend more time stalking and less time hochsitzing. I have somewhere suitable in mind, but the digit requires extractive work :lol: .

I also plan to sight in a Micro on the 8x57 (52cm) barrel. That will make a very quick and sweet handling set up. :D

User avatar
mchughcb
Moderator
Posts: 8802
Joined: Tue Aug 25, 2009 2:55 am
Location: Melbourne Australia

Re: 8x57 JRS 220gn RN Woodleigh

Post by mchughcb » Fri Jan 12, 2018 12:51 am

51gr is about max.

Dinger
Posts: 255
Joined: Thu Mar 10, 2016 4:17 am
Location: Australia

Re: 8x57 JRS 220gn RN Woodleigh

Post by Dinger » Fri Jan 12, 2018 1:51 am

I'm running my K95 2 grains over book max for 2208.....zero pressure issues in varying conditions. Haven't taken it any further than this though as velocity was good and it was a compressed load.

secondtry
Meister der jagd
Posts: 1208
Joined: Fri Nov 23, 2012 8:22 pm
Location: Victoria Australia

Re: 8x57 JRS 220gn RN Woodleigh

Post by secondtry » Fri Jan 12, 2018 2:06 am

mchughcb wrote:51gr is about max.
Interesting.

IN MY RIFLE 51g would be nothing short of a total joke.

I didn't have any data available so followed my usual practice of careful interpolation to find a start point, bearing in mind that before the 220s, I had already successfully worked up a load with 200NPs and 2208/Varget, thus giving me an idea of my rifle.

I started at 54g, at which point velocities, and apparently pressures, were erratic and inconclusive - around 2360. Pressures were also very mild.

As I increased the charge, things started to come together at 56gn.

In my rifle, I would guesstimate that 51 would be a dirty, low pressure, erratic load which would be lucky to clock 2200. Detonation anyone ?

I don't believe that there is anything unusual in my barrel. I am about .0035/0040 off the lands, with about .265 in the neck. The sized length of the case necks is well under .323, so .265 is not as shallow as it may seem. Long throated perhaps, but no more than I have come to expect from Euro rifles.

BTW mine and Dinger's 200NP loads are almost identical in charge weight (2208) and velocity. Both 8x57JRS K95s. Like Dinger I could also have pushed the 200s faster but accuracy deteriorated when I tried.

Go figure.

User avatar
Gun Barrel Ecologist
Moderator
Posts: 4677
Joined: Sun Aug 23, 2009 12:54 pm
Location: Queensland Australia

Re: 8x57 JRS 220gn RN Woodleigh

Post by Gun Barrel Ecologist » Fri Jan 12, 2018 2:11 am

Try them at Belmont - I reckon they'll be dangerous :whistle:

:lol: :lol: :lol: :lol:

secondtry
Meister der jagd
Posts: 1208
Joined: Fri Nov 23, 2012 8:22 pm
Location: Victoria Australia

Re: 8x57 JRS 220gn RN Woodleigh

Post by secondtry » Fri Jan 12, 2018 3:34 am

Gun Barrel Ecologist wrote:Try them at Belmont - I reckon they'll be dangerous :whistle:

:lol: :lol: :lol: :lol:
Definitely thinking outside the square GBE, but how do we get the Sambar to Belmont ? :D

User avatar
Gun Barrel Ecologist
Moderator
Posts: 4677
Joined: Sun Aug 23, 2009 12:54 pm
Location: Queensland Australia

Re: 8x57 JRS 220gn RN Woodleigh

Post by Gun Barrel Ecologist » Fri Jan 12, 2018 3:50 am

My tip would be using something like this

https://www.evakool.com/evakool-200-lit ... ass-icebox

User avatar
stokesrj
Moderator
Posts: 4417
Joined: Mon Jun 17, 2013 12:41 pm
Location: USA
Location: Palm Harbor, FL, USA

Re: 8x57 JRS 220gn RN Woodleigh

Post by stokesrj » Fri Jan 12, 2018 7:42 am

The pressure limits used for the 8X57 JRS in public load data are well under the brass, primer, or K95 capabilities, 48,000 PSI. After all the K95 is chambered in .257 and 300 Weatherby which are at 65,000 PSI.
Robert J Stokes

JPBlaser
Posts: 222
Joined: Thu Jan 07, 2016 4:14 am
Location: Finland

Re: 8x57 JRS 220gn RN Woodleigh

Post by JPBlaser » Fri Jan 12, 2018 8:43 am

I also think that modern brass ,primers and rifles can easily handle around 62,000 psi of pressure.
Most of the old cartridges are well under loaded in modern factory ammo(rws is kind of an exception).
By reloading and using the modern powders one can get really nice results with old cartridges like the 8x57 or the 6.5x55...
Jordan

Post Reply

Return to “BlaserBuds 8X57JRS Load Database”