Temp sensitivity of V V powders

Discussion in 'Reloading Forum (All Calibers)' started by TAJ45, Jul 12, 2018.

  1. TAJ45

    TAJ45 Gold $$ Contributor

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    Actually a couple of questions.
    Suitability of 140, 150, 160 w 6 BR through 6xc, 6 Creed.
    Then temp sensitivity...of those please.
     
  2. Down South

    Down South FTR Junkie Gold $$ Contributor

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    Shot a lot of N-150 and never had issues with temp changes. This was .308 in FTR. I've heard the 500 series (540, 550 etc.) are more sensitive to temp changes.
     
  3. lpreddick

    lpreddick Gold $$ Contributor

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    Yes! The N 500 series are double based and perform differently in cold weather vs hot weather...learned the hard way. N540 in my 22-250 with a 55 gr bullet shot bugholes when worked up in cold weather. When they were shot in August i could barely get bolt open and primers were FLAT! N100 series are single based( nitrocellulose) and I believe are less sensitive, but I defer to the benchrest shooters who shoot a lot on N 133.
     
  4. Dusty Stevens

    Dusty Stevens COVFEFE- Thread Derail Crew Gold $$ Contributor

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    N133 has to be changed all the time to keep perfect. Thats why br shooters load at the range
     
  5. ShootDots

    ShootDots Gold $$ Contributor

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    I have no first hand experience with either N140 or N160. However, I have a fair amount of experience with N150. Excellent powder. Not too bad temp stability wise. Remember, ANY powder loaded either at the top of the node or bottom of the node, once you get a sizable temp swing, will push it out of it's node. Get a node with a W-I-D-E window and generally speaking you will be good to go. However, since you are talking about the 6XC and the 6 Creed, if you wanted ONE powder, I would opt for RL-16. Then there will be no worries about temp swings!
     
    boltfluter and 1shot like this.
  6. barefooter56

    barefooter56

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    VihtaVouri powders will all have temperature stability and de-coppering agents through the whole line of powders in the future. Right now N-150 has this. I have not heard anything yet on the other powders. I used N-550 for my PALMA loads and had no issues due to heat. But I did my work up for that load in extremely warm weather since that is when it would be used.
     
  7. michaelbz

    michaelbz

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    If you change formulas, retardants, etc, you should really give the powder a new name, like N151. First, it brings attention, hype, and sales to your new formulation, and helps recap your R&D investment. Second, even if the burn rate is similar, differently formulated powders don't really perform the same. I really dislike companies changing their products without delineation.
     
  8. 338bigdog

    338bigdog Silver $$ Contributor

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    I use N-160 in my 6xc load development was done in late spring. Fine tuned the load and dropped the load down .3gr. Shoots great haven’t noticed anything to convince me that it isn’t temp sensitive
     
    Idaho-Lefty likes this.
  9. Dusty Stevens

    Dusty Stevens COVFEFE- Thread Derail Crew Gold $$ Contributor

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    If you change n133 at all thatll spell disaster for benchrest shooter’s business- the folks that buy cases at a time, multiple times a year. Accurate powder will be putting in another shift to churn out lt32.
     
  10. rhovee

    rhovee

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    I have shot and tested N570. The unicorn tears of VV. It was very good. Actually picked up a little (15) FPS when it was really Cold. From 30-70 it was very stable when I tested it.
     
  11. ShootDots

    ShootDots Gold $$ Contributor

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    Phil, I know that N165 is coming out very soon with N565, the Temp Stable, De-Coppering agent etc... Is this going to be the "forerunner" of the other powders. I have used N150 "fairly" regularly and would LOVE to see N150, N160 and N165 become like N565! Any news on this front?
     
  12. Laurie

    Laurie

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    Steve Donaldson one of the UK's top F/TR shooters has used Lapua Palma brass, 210gn Berger LR BT and Viht N550 for several years. His loads aren't exactly mild - nearly 2,700 fps, but he runs one helluva barrel length!

    He shot at Raton in the US F-Nationals and FCWC in 2013 with temperatures in the mid to high 90s for the first week and only a little lower in week 2. He shot every individual and team match on the program and his rifle was used by some of his fellow Rutland team members (can't remember what they were called, US shooter and great all round guy Biff Conlon put it together and funded it).

    I asked him afterwards if he'd had to change his UK load (80s is very warm for us, so as we shoot all year round, we're talking just above freezing to around 80, but more often 70s) knowing the 500 series reputation for temperature sensitivity. The answer was no - he tried his usual load, it shot well without pressure problems and he just carried on as usual.

    (UK competitors took brass and bullets over as hold luggage and handloaded on site with locally supplied powders and primers.)
     
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