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VV555 and .284

Has anyone tried VV555 in the .284 yet with 175-180 grain bullets and if so what is the results? I have a feeling that H4831sc if going to be unobtainium, and I don't want to build a rifle around components that are not available.
I run 52.8 grains of vv555 with 180 hybrids 28" barrel accuracy is great. My friends are running 52.2 but they are shooting 30" barrels. I'm running around 2750.
 
Has anyone tried VV555 in the .284 yet with 175-180 grain bullets and if so what is the results? I have a feeling that H4831sc if going to be unobtainium, and I don't want to build a rifle around components that are not available.
not me but i do know of someone that does .his name is erik
 
Took a first look see the other day and did a 1 shot ladder from 51.5 grains (2730fps) to 52.9 gr (2790fps). Grouped well around 2760.
 
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For Viht grades, N160 and 165 are the obvious and well-proven choices. The latter gives excellent results at the cost of running slightly / moderately compressed charges in Lapua brass, and has the plus of being a very cool-burning powder associated with excellent barrel life. It'll give either weight bullet the widely used 2,820-2,850 fps MVs from a 30-inch barrel.


You do realise IMR-4166, as with all IMR 'Enduron' grades, is double-based? A friend has described N555 as 'the N100 that pretends to be a 500.' At 3,700KJ / Kg specific energy content, it's the same as N120, 140, and 170 and is actually rated as lower energy than N150

https://www.vihtavuori.com/powders/n500-powders/

https://www.vihtavuori.com/powders/n100-powders/

I would never advise N150 for this cartridge with 175/180s, far too fast burning despite what burn-rate charts show. N555 appears to be slightly faster burning, or even the same burn-rate, as N160 based on Viht's limited range of published loads comparing maximum charges for the same bullets. In Creedmoor / 260 Rem sized cartridges, the two powders have more or less same maxima, N555 even marginally higher with some bullets. In the two largest cartridges covered by Viht - 30-06 and 284 Win - its top charges then become slightly lower than those for N160. I've tried N555 in 7mm-08 and 260 Rem with 160/142gn bullets so far and got decent, but not spectacular results.

Given that N160 is shown as slower burning in burn rate charts (and given a default Ba value in QuickLOAD) than appears to be the case in actual applications, I'd characterise it as a tad slower burning than H4350, but nowhere near as slow-burning as either 4831, that'll also put N555 somewhere in the same bracket.
This is a smart answer. Thank you sir.....
 

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