Viht N555 - The Ultimate Creedmoor Powder?

[No i deer]

21 minutes ago, Scooby-93 said:

46gr with 147Eld was 2960 in mine not seated to long, still fitted in standard ai mag length 

That's fast 😁

[Scooby-93]

Lapua SRP

[baldie]

4 hours ago, Catch-22 said:

Nearly 3000fps with a 142SMK from a 26” barrel! That does sound awfully high.

I know Viht data is very anaemic but that’s way off the chart. I guess a very long throat, thus seated well out of the case, may help. 

Nope, standard chamber and throat.

Its a fast barrel [as most Sassen's are} small diameter firing pin, allied to the SRP brass, and a good stout action.

The same load runs perfectly well in my friends tikka, which I fitted and chambered with the same reamer.

We are cleaning up with this load in the military F class at Diggle.

Its not a stupid load, but I only tend to use Vhits data as a guideline, I've developed enough cartridges to find my way carefully, which is why I'm not going to publish the charge chaps, its safe in the guns i've tested it in, it may not be in other peoples .

By far, the fastest, most accurate load I've used in a creedmoor, and i've been building the cartridge about 15 years.

Wish I had shares in it !😂

[Scooby-93]

12 minutes ago, baldie said:

Nope, standard chamber and throat.

Its a fast barrel [as most Sassen's are} small diameter firing pin, allied to the SRP brass, and a good stout action.

The same load runs perfectly well in my friends tikka, which I fitted and chambered with the same reamer.

We are cleaning up with this load in the military F class at Diggle.

Its not a stupid load, but I only tend to use Vhits data as a guideline, I've developed enough cartridges to find my way carefully, which is why I'm not going to publish the charge chaps, its safe in the guns i've tested it in, it may not be in other peoples .

By far, the fastest, most accurate load I've used in a creedmoor, and i've been building the cartridge about 15 years.

Wish I had shares in it !😂

Dave, have you noticed much difference in small/large firing pins with loads which rounds utilise SRP? 
 

with my load I’m using large rifle pin in Lapua SRP brass, the primer is cratered due to the pin, would a small pin do away with the cratering or would the full load need to be redeveloped etc?

[Catch-22]

1 hour ago, baldie said:

Nope, standard chamber and throat.

Its a fast barrel [as most Sassen's are} small diameter firing pin, allied to the SRP brass, and a good stout action.

The same load runs perfectly well in my friends tikka, which I fitted and chambered with the same reamer.

We are cleaning up with this load in the military F class at Diggle.

Its not a stupid load, but I only tend to use Vhits data as a guideline, I've developed enough cartridges to find my way carefully, which is why I'm not going to publish the charge chaps, its safe in the guns i've tested it in, it may not be in other peoples .

By far, the fastest, most accurate load I've used in a creedmoor, and i've been building the cartridge about 15 years.

Wish I had shares in it !😂

Very cool indeed.

I wonder if it could translate to the 6.5x47? A 140gn behind N160. Undoubtedly it won’t get up near the Creedmoor’s velocity but may not be too far off?

My only thought was the x47 case is just a smidge smaller and thus may not be able to stuff enough N160 in to fully realise the potential.

I don’t use 160 in any of my other cartridges, so haven’t thought to use it. Maybe someone with the x47 and N160 could give it a try sometime?

[No i deer]

I will be trying N160 in my 6.5x47 when we can get back out..

[No i deer]

42grs tapping the case a few times settled at bottom of the neck and would be slightly compressed with a 140gr amax.

A 139gr scenar would be way more compressed.

I thought I'd get more powder in than that 🤔.

[VarmLR]

I'm using 44gr RS62 under a 139 Scenar seated at 15 thou off the lands.  Load started to compress at a few grains more but at 44grns was fine.  2700fps@20 degrees C using Lapua SRP brass from a 24 inch Tikka barrel.  LRP brass gives around 100fps more using over a grain less, so ties in very well with H4350 and N160.  I doubt there's much to chose between N160 and RS62.  Does anyone have any pressure sensitivity data on N160 so I can compare with RS62?  If N160 is less sensitive I may switch to using that.

Post-edit...actually, checking the specs, there is enough of a difference to show RS62 is the better choice (see below).

[No i deer]

4 hours ago, VarmLR said:

I'm using 44gr RS62 under a 139 Scenar seated at 15 thou off the lands.  Load started to compress at a few grains more but at 44grns was fine.  2700fps@20 degrees C using Lapua SRP brass from a 24 inch Tikka barrel.  LRP brass gives around 100fps more using over a grain less, so ties in very well with H4550 and N160.  I doubt there's much to chose between N160 and RS62.  Does anyone have any pressure sensitivity data on N160 so I can compare with RS62?  If N160 is less sensitive I may switch to using that.

44grs of RS62 In a creedmoor..??

[No i deer]

At 41.5grs of RS62 in my 47 the 139gr scenar doesn't seat to the desired comparator measure as it's compressing.. sometimes 2 pumps and a a slight adjustment on the micrometre to get them within a thousanth as it's pretty compressed...

Seat a bullet without any powder and it seats really easily..

[VarmLR]

19 hours ago, No i deer said:

44grs of RS62 In a creedmoor..??

Yes.  No problem at all.  I've been using that load for a few years.

[Catch-22]

On 4/23/2020 at 9:39 PM, No i deer said:

42grs tapping the case a few times settled at bottom of the neck and would be slightly compressed with a 140gr amax.

A 139gr scenar would be way more compressed.

I thought I'd get more powder in than that 🤔.

I think you’ll need to use bullets heavier than the 139g to maximise the potential of N160. I suspect you may not get significant velocity gains with that weight. But if going ultra heavy, I think you’ll start to reap the returns for such a slow burning powder. Going heavy will also mean your charge weight should be a little lower too, so should fit in the case.

I don’t have any 6.5mm bullets heavier than the 123g Scenars, which have always been great with N140. 
I might need to pickup some 142SMK or 147g ELDM and N160, though I’m not liking the 147g prices - crazy imho!

[VarmLR]

They are crazy.  Must admit I stick with 139 Scenars..they just work and aren't to spendy.

[No i deer]

[No i deer]

[Catch-22]

As suspected, N160 isn’t generating enough oomph with the lighter 139g bullet compared to the slightly faster burning RS62.

I bet if you ran the numbers again using a 142SMK or 147g with N160 and RS62, you’ll probably find the N160 produces better velocity for the charge.

[No i deer]

I thought the N160 I have in stock for my 284 for launching the 180gr ELDM's would of fed my 6.5x47 aswell being on my last 1kg of RS62 which is lasting too long at the mo 🙄.

I do have a few 142gr smks I could use to find the oal for Mark to run the figures with..

The RS62 quickload predictions are very close to what I got. 41.5grs didn't shoot or feel right when I tested it..

41grs was much better.

When my new barrel is fitted it will be 3 inches shorter which was another reason I hoped the N160 would have a higher performance..

[VarmLR]

I think that part of the issue using N160 with the 6.5 x 47 is the bulk density doesn't allow enough into the case to generate the speeds but also the specific energy is somewhat lower than H4350 and RS62.

N160 is rated at a relatively low 3,620 joules, H4350 (sadly no longer an option here) is 3,760 Joules and RS62 is 3,750 Joules so much closer to H4350 than the N160.

Bulk density of the N160 is 920 so less than RS62 which is 960 hence you won't be able to get as much into the case weight-wise using N160.  It might suit a taller powder column and heavier bullet but doesn't seem ideally suited for what you need it to do.  Unfortunately until the lockdown is over, that means you have a choice...either make some reloads using the remaining RS62 or wait a while?  Cost of specialist delivery wouldn't be worth it for a few Kilos.

[No i deer]

Thanks Varm.

I read an article not long ago and si snipe was using 147gr ELDM's in his 6.5x47 and I think he was running about 2770fps on or very near 41grs of RS62..

Nearly 200fps down on somebody on this thread was getting 2960fps I think on 46grs of N160 in their creedmoor 😳.

200fps is a huge difference..

This may see a pressure spike on a warm day 😅

 

[VarmLR]

I think the differences between the CM and 'x47 are that while you can probably get similar velocities with say a 139 or 123 Scenar or similar using RS 62, but you're having to run the 'x47 to higher pressures.  The 260 and CM just have slightly longer legs due to the case capacity differences,  but i get why the '47 is so popular. 

[No i deer]

I had 2000 shots with my current 6.5x47 and it's been great and have another barrel ready too be fitted to follow on for when my current one dies.. it's shot great out to 1000yds but I use it mainly out to 600yds and has plenty of legs to do that. I prefer a 7mm bullet for long range 😁

 

[No i deer]

6.5x47 with 142gr and N160

[Condition1]

Dragging this old thread up again. I can’t get RL16 anywhere so going to have to work up a new load. Was thinking for easy to find vit N-160 plenty of info around then I read about this N-555

 

i use 147 led-M but don’t even have a recipe for that not that much of an issue I can work up but I like to have a baseline can’t find any recipes or people having experience with it with 147, 

So just go with N-160?