Viht n568 ?? Hardly any data…

[Alex36]

Hey, just been looking for a temp insensitive powder replacement for my 28N/195 eol load I’m just about out of Re33 and the stuff is phenomenal in that caliber and wieght speed and accuracy top notch. But temp increase 20 degrees and the load is now off it’s node. It’s pretty sensitive especially to warmer temps. Colder temps it’s been okay. I’ve been looking at imr 8133, and n570 but of course can’t get my hands on any .. I’ve got 19 pounds of retumbo but I’m pressuring out at 2930-50fps
The 33 gets me 3100 all day long with no pressure. I should say the throat is throated for the 195s my coal is 3.730 to touch I run them 15 thousands off so 3.715 So I can fit a lot powder in there. I’m at 87.0 grs of 33. My rifle just won’t shoot retumbo. Please trust me I’ve ladder tested and found the flat spots low and high node at every 5 thousands on seating depth. I get better velocity out h1000. Anyways to my main question and on to the point , I’ve picked up an 8 pounder of viht n568
I’ve read enough to know it’s not quite as bad ass as the 570 but it’s a sc and if you can get the volume in there with a heavy for caliber it will match the speed of 570. It’s supposedly extremely accurate and virtually temp insensitive as a powder gets. I can’t find any data on this. Vihtavuori has a couple loads for 300 prc and 6.5 prc. Mainly I want to run it in my 28n with the 195. And heavies in 7mag and 300wm. Any of you guys have any experience with this stuff? Thank you for any help guys. Is it worth a QL I can list the specifics ..

28n
26” barrel
3.715 col
Hornady brass (don’t know much water it holds I’m not at home at the moment ) I do have nosler brass if that helps the QL
Berger 195 eol
Fed 215m.
Viht n568

 

[DrMike]

Cartridge : .28 Nosler
Bullet : .284, 195, Berger ElHunt G7 #28550
Useable Case Capaci: 89.049 grain H2O = 5.782 cm³
Cartridge O.A.L. L6: 3.715 inch = 94.36 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : Vihtavuori N568 *C*T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-10.0 86 73.62 2692 3137 46104 14002 99.0 1.590
-09.0 87 74.44 2722 3208 47654 14126 99.2 1.565
-08.0 88 75.26 2752 3279 49254 14244 99.4 1.540
-07.0 89 76.07 2782 3350 50905 14354 99.6 1.516
-06.0 90 76.89 2811 3422 52609 14457 99.8 1.492
-05.0 91 77.71 2841 3495 54368 14552 99.9 1.469
-04.0 92 78.53 2870 3568 56184 14640 99.9 1.446 ! Near Maximum !
-03.0 93 79.35 2900 3641 58058 14719 100.0 1.424 ! Near Maximum !
-02.0 94 80.16 2929 3715 59993 14791 100.0 1.402 ! Near Maximum !
-01.0 95 80.98 2958 3789 61992 14860 100.0 1.381 ! Near Maximum !
+00.0 95 81.80 2987 3863 64056 14928 100.0 1.360 ! Near Maximum !
+01.0 96 82.62 3016 3938 66188 14995 100.0 1.339 !DANGEROUS LOAD-DO NOT USE!
+02.0 97 83.44 3044 4013 68391 15060 100.0 1.319 !DANGEROUS LOAD-DO NOT USE!
+03.0 98 84.25 3073 4089 70668 15125 100.0 1.299 !DANGEROUS LOAD-DO NOT USE!
+04.0 99 85.07 3101 4164 73020 15188 100.0 1.280 !DANGEROUS LOAD-DO NOT USE!
+05.0 100 85.89 3130 4241 75453 15251 100.0 1.260 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 95 81.80 3106 4178 77450 14381 100.0 1.252 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 95 81.80 2807 3411 50830 15228 97.8 1.506

Looks as if it misses your desired velocity somewhat.

 

[DrMike]

Don't know if any of this works for you, but here it is in any case.

Cartridge : .28 Nosler
Bullet : .284, 195, Berger ElHunt G7 #28550
Useable Case Capaci: 89.049 grain H2O = 5.782 cm³
Cartridge O.A.L. L6: 3.715 inch = 94.36 mm
Barrel Length : 26.0 inch = 660.4 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 65000 psi, or 448 MPa
or a maximum loading ratio or filling of 112 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

66 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
ADI AR 2218 100.7 88.0 5.70 3098 100.0 65000 16438 1.313 ! Near Maximum !
Vihtavuori N570 *C 96.2 83.2 5.39 3045 99.9 65000 16077 1.345 ! Near Maximum !
Alliant Reloder-33 *C 97.9 87.2 5.65 3032 100.0 65000 15867 1.350 ! Near Maximum !
Ramshot LRT 99.6 88.2 5.71 3031 97.8 65000 16258 1.323 ! Near Maximum !
Alliant Reloder-50 *C 102.1 90.6 5.87 3030 99.9 65000 16254 1.376 ! Near Maximum !
Hodgdon H870 102.1 86.5 5.61 3016 100.0 65000 15313 1.352 ! Near Maximum !
ReloadSwiss RS 80 *C 95.3 84.9 5.50 3006 100.0 65000 15067 1.359 ! Near Maximum !
ReloadSwiss RS 76 *C 92.7 81.9 5.30 3005 100.0 65000 14362 1.348 ! Near Maximum !
Vihtavuori N568 *C*T 95.9 82.2 5.32 3000 100.0 65000 14958 1.350 ! Near Maximum !
Bofors 12,7mmRA NC1214 Lot20115087 103.0 89.4 5.80 2988 96.0 65000 16312 1.374 ! Near Maximum !
Hodgdon 50BMG 105.1 87.6 5.68 2986 94.8 65000 15928 1.333 ! Near Maximum !
IMR 8133 Enduron *C*T 102.4 82.2 5.33 2982 100.0 65000 14444 1.356 ! Near Maximum !
Vihtavuori 20N29 *C 106.9 94.4 6.12 2981 99.1 65000 15446 1.355 ! Near Maximum !
Vihtavuori 24N41 *C 99.8 87.3 5.65 2980 97.6 65000 15379 1.327 ! Near Maximum !
Accurate 8700 106.9 91.6 5.93 2978 99.9 65000 14780 1.340 ! Near Maximum !
Norma 217 *C 101.5 82.0 5.32 2977 100.0 65000 14142 1.367 ! Near Maximum !
ADI AR 2225 99.5 82.1 5.32 2974 100.0 65000 13794 1.344 ! Near Maximum !
Hodgdon Retumbo 99.5 82.1 5.32 2974 100.0 65000 13794 1.344 ! Near Maximum !
Hodgdon US 869 104.7 91.5 5.93 2971 97.6 65000 15430 1.342 ! Near Maximum !
Norma MRP 2 *C 95.6 78.4 5.08 2962 100.0 65000 14065 1.356 ! Near Maximum !
Bofors RP30 95.6 78.4 5.08 2962 100.0 65000 14065 1.356 ! Near Maximum !
PB Clermont PCL 513/520/9520 108.3 90.8 5.89 2962 99.4 65000 14957 1.351 ! Near Maximum !
PB Clermont PCL 517 91.0 79.7 5.17 2960 100.0 65000 13855 1.345 ! Near Maximum !
SNPE Vectan SP 12 90.9 79.6 5.16 2958 100.0 65000 13821 1.346 ! Near Maximum !
IMR 7828 92.7 73.9 4.79 2956 100.0 65000 13706 1.330 ! Near Maximum !
SNPE Vectan SP 13 106.5 89.3 5.79 2956 99.8 65000 14712 1.354 ! Near Maximum !
Vihtavuori N565 *C*T 92.6 78.1 5.06 2948 100.0 65000 13997 1.361 ! Near Maximum !
ADI AP 2214 92.4 78.7 5.10 2948 100.0 65000 13449 1.328 ! Near Maximum !
ADI AR 2217 97.2 78.9 5.11 2946 100.0 65000 13413 1.329 ! Near Maximum !
Hodgdon H1000 *T 97.2 78.9 5.11 2946 100.0 65000 13413 1.329 ! Near Maximum !
Bofors RP5 NT *C ~approximation 92.7 77.6 5.03 2941 100.0 65000 13839 1.323 ! Near Maximum !
NC A3502 ,test only 112.0 89.9 5.83 2937 93.1 58984 17051 1.357 ! Near Maximum !
Somchem 12.7-0 105.6 89.5 5.80 2936 94.6 65000 14880 1.327 ! Near Maximum !
Bofors RP15 91.4 74.2 4.81 2934 100.0 65000 13525 1.345 ! Near Maximum !
Winchester WXR 91.4 74.2 4.81 2934 100.0 65000 13525 1.345 ! Near Maximum !
Alliant Reloder-25 *C 93.4 76.2 4.94 2924 100.0 65000 13073 1.349 ! Near Maximum !
Rottweil R905 90.5 73.8 4.78 2924 100.0 65000 13405 1.340 ! Near Maximum !
Vihtavuori N170 *C 100.5 81.6 5.29 2917 99.5 65000 14096 1.350 ! Near Maximum !
Lovex D100 97.9 86.5 5.60 2911 97.9 65000 14205 1.340 ! Near Maximum !
Shooters World BMG 97.9 86.5 5.60 2911 97.9 65000 14205 1.340 ! Near Maximum !
Hodgdon H4831 *T 92.0 73.4 4.76 2902 100.0 65000 13062 1.329 ! Near Maximum !
IMR 4955 Enduron *C*T 90.2 72.1 4.67 2876 100.0 65000 12717 1.324 ! Near Maximum !
IMR 7977 Enduron *C*T 94.9 77.1 4.99 2867 98.6 65000 13218 1.322 ! Near Maximum !
TLP A 502(RH) ,test only 112.0 89.9 5.83 2865 88.7 57572 15137 1.391 ! Near Maximum !
Vihtavuori N165 *C 91.9 74.6 4.83 2850 100.0 65000 12105 1.347 ! Near Maximum !
Bofors RP36 ZT *C *T 90.0 72.3 4.68 2850 100.0 65000 12044 1.362 ! Near Maximum !
Alliant Reloder-23 *C *T 90.0 72.3 4.68 2850 100.0 65000 12044 1.362 ! Near Maximum !
Lovex S071 94.6 73.4 4.76 2831 100.0 65000 11918 1.375 ! Near Maximum !

 

[Alex36]

Thank you, this helps quite a bit. I didn’t even have a clue where to start with it. Plus the 2nd QL you sent with all the powders is pretty close at their near maximum to what I’ve got in my notebook of where I hit pressure with retumbo h1000 and it’s spot on almost to my re33 load.
It does look a bit slower FPS but I was willing to drop down to 3020-30 with retumbo but I just couldn’t get it to work. It’s the only rifle I’ve not been able to make magic of the retumbo with. Shoots 33 like a dream tho. Anyways the 568 looks to be around the same fps as retumbo maybe a touch more. Willing to give up some FPS for temp stable es/sd. I’ve got 700-1000 yard shots around my place on bucks/bulls. I have a window now to load a ladder test with which is exactly what I was looking for. Thanks again Don’t get me wrong if I could buy an 8 pounder of 33. I’d just stick with it. But again put that on the pixie dust list .. can’t find it

Still would love to hear anyone’s work ups or use of this powder in any caliber .. n568

 

[DrMike]

Don’t get me wrong if I could buy an 8 pounder of 33. I’d just stick with it. But again put that on the pixie dust list .. can’t find it

Well, stranger things have happened. Who knows, pixie dust may be found the next time you go into your LGS. I found six bags of Winchester 307 Win brass yesterday, and it was marked almost $20 less than any of the other brass on the shelf. For those who need that strange brass, it was a great find.

 

[Alex36]

I did see some 307 hornady the other day at sportsman’s now I think about it. Ya very true I also try as much as possible to support my local gunsmith (he sells all the things also) I definitely try to stay away from or support the online gouging machine that has revealed itself as of late. There’s few left out there that are honest In my humble opinion. Typically the LGS are the best at it for sure. My buddy did walk into a sportsman’s the other day and 8 pounder of h1000 was sitting there all by itself..
That one made me a bit jealous I have to admit,I shoot more of that than anything through my 2 7 mags and my wife’s 7 mag . Of course he’s a brand new Reloader (less than a year) and I told him it must be beginners luck .. only thing I could think of.

 

[Alex36]

Got an update , the powder showed up Wednesday. I’m out in the back yard shooting my ladder on the n568 right now. This is the first charge I feel I’m coming up to pressure on bolt lift was easy, no ejector mark but primer has a touch of flattening and where the firing pin hit it’s starting to barely protrude out. I’ll attach the whole ladder and work up and pics tonight. To Dr mike - your QL reference looks like it’s to be about spot on. I might be getting a few more FPS than it showed but max charge looks to be around 81.8-82 grs and should be a touch over 3000. Im hoping for 3020 mv. You were right on the speed being a bit lower than re33. At this point I’m okay with 3000-3020. As long as the es/sd is good. This powder reminds me very much of retumbo. It’s almost identical speed to charge wieght/density. The problem I was having with retumbo was the es was 50-60
and I couldn’t ever find a node above 2900 fps
This 568 is seems to be a bit more consistent in my rifle. It was climbing 9-12 FPS per .2 gr increments. The retumbo was all over the place I’m in somewhat of a flat spot at 81.0 I still need to finish the ladder test and then build a group on the node (which right now after this shot I can pretty much say it’ll be 81.0-81.5) and see how it groups ! I’ll post everything when done.