Question about powders

[Rex Rugged]

I bought some Vihtavuori N560 for a 270 magnum rifle at a good price. I see where powder recommendations for another rifle I have, my 270 Win. is N540 which is a faster burning powder. I can find no load data for the 560 in the 270 win. Can I adjust by staying with the minimal amount of 560 in my 270 win?

[ligonierbill]

Why not Google vihtavouri load data? They have plenty of data for N560 in 270 Win. It's my go to powder for 338 Win Mag and 7mm Rem Mag.

[Rex Rugged]

I did they do not have it posted and has a disclaimer about not having completed all their testing with various loads.

[Jim Watson]

How strange, I found

130 Swift Scirocco II 3.331
N560 start 54.0gr maximum 59.0C
start 2831fps maximum 3104

https://www.vihtavuori.com/reloading.../-1/-1/130+150

[Rex Rugged]

I'm loading a Speer 90gr. I've already loaded them with Hogden 4831SC but I have 8 lbs of N560 I'd like to use. Sierra's manual lists N540 for this bullet but nothing about N560. Vihtatouri does not list a 90 gr bullet.

[Unclenick]

The lighter a bullet is, the less well it works with slow powders because it accelerates so quickly that expansion of the powder burning space is to fast for the slow powder to make gas fast enough to keep up. This usually results in dirty burning and a lot of unburned powder in the bore and ejected from the gun. But there is also a nasty phenomenon that rears it's head from time to time when using bullets too light for a powder. The bullet starts into the bore and out runs the bulk of the powder mass in the case so quickly that pressure in the expanded space actually drops, slowing the bullet and giving the powder mass time to build pressure and speed up and actually run into the base of the bullet. This creates tremendously high pressure local to the bullet base collision, and it can not only cause bore ringing, but Texas gunsmith Charlie Sisk was actually able to blow muzzles off 338 barrels on demand with a particularly bad bullet and powder combination.

Bottom line: you may want to wait for VV to finish testing the combination before you try it.

[Rex Rugged]

Thank You Unclenick

[sako2]

VV only has data for 130gn and up bullets in the 270.

[Rex Rugged]

The interesting thing both powder and bullet are listed in the Sierra manual for the 270 mags. That appears to substantiate what UncleNick was saying.

[sako2]

With a 90gn bullet?

[Shadow9mm]

Buying powder based on them being a good deal seems to be a strange way to pick a powder to me. Granted we all want to be economical, but trying to make things work generally results in sub optimal performance in my experience.

I generally have a short list of powders that I am looking for, and those are what I will buy. I'm not grabbing a new powder without a fair bit of research,

[Jim Watson]

With a 90gn bullet?

You didn't say that to start with. A 90 gr .270 is kind of a novelty and you will have to use a powder that somebody bothered testing with.

[P Flados]

In the 270 Win, N560 loads are compressed for heavier bullets. This means that the powder is on the slow side for a 90 gr bullet.

VV may not come out with load data for your combination if it is too far off of optimum.

It would probably be safe to work up loads starting with close to 100% fill, but this is typically recommend for experienced reloaders who understand the risks (see post 6).

A better idea might just be to see if you can get some heavier bullets so you can use available load data. According to Quickload, N560 is one of the best choices available for 130 gr bullets.

[sako2]

Jim i didn't say that i said with a 130. Rex Rugged said he's loading a 90gn. I asked if the sierra data he had was with a 90gn bullet.

[Rex Rugged]

You are making an assumption I did not buy the powder I wanted. I found a good deal for exactly what I wanted. I just expanding my knowledge.

[Rex Rugged]

I use to shoot 90 gr bullets with IMR 4350 a good deal in my Savage. It was a very accurate load. I am just returning to reloading after twenty years of being away from it. There is a lot of new options out there! One of the things I have not shared is I am reloading for a 270 Win and a 270 Weatherby Magnum. Hence the N560, a powder for magnum rifles. I just trying to define areas of overlap between the two if there are any.

[sako2]

you can use it in the 270 as long as you load a 130gn bullet or heavier.

[ackley man]

Here you go
https://shootersreference.com/reload...therby-magnum/

[georgehwbush]

nice site! where has that been hiding ?

[stagpanther]

Here is VV's data for 270 win--it goes up to 160 gr bullets and seems to indicate 560 is fine. I do use 560 in my 270 Weatherby mag but have not used it in 270 win. I don't see 540 in any of their 270 win loads.

[stagpanther]

The lighter a bullet is, the less well it works with slow powders because it accelerates so quickly that expansion of the powder burning space is to fast for the slow powder to make gas fast enough to keep up. This usually results in dirty burning and a lot of unburned powder in the bore and ejected from the gun. But there is also a nasty phenomenon that rears it's head from time to time when using bullets too light for a powder. The bullet starts into the bore and out runs the bulk of the powder mass in the case so quickly that pressure in the expanded space actually drops, slowing the bullet and giving the powder mass time to build pressure and speed up and actually run into the base of the bullet. This creates tremendously high pressure local to the bullet base collision, and it can not only cause bore ringing, but Texas gunsmith Charlie Sisk was actually able to blow muzzles off 338 barrels on demand with a particularly bad bullet and powder combination.

Bottom line: you may want to wait for VV to finish testing the combination before you try it.
__________________
Gunsite Orange Hat Family Member
CMP Certified GSM Master Instructor
NRA Certified Rifle Instructor
NRA Benefactor Member and Golden Eagle

My memory isn't very good--but didn't someone else bring up using 90 gr bullets in 270 win in the last year or two? Seems to ring a bell for some reason.

[Unclenick]

I've forgotten, but I think maybe Harold Vaughn ran 90s in the 270W when he was illustrating core stripping in Rifle Accuracy Facts. No other mention with respect to the 270W comes to mind.