Ronred
Member
Anyone had any issues with Viht. N570 losing velocities over extended period of time?
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Viht. N570
- Thread starter Ronred
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There's only one way to find out: run your load through a Chrono and compare it to when you first had it. Not N570, but I have some 5-plus-year-old open powders without noticeable loss in velocity.
ADDED: I ran into this old thread from another forum - https://forum.accurateshooter.com/threads/barrel-slowing-down.3943639/page-2. The OP used a different powder, but it might help you troubleshoot. The OP is also an LRH member - @Rhovee. Good luck!
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Shane Lindsey
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I have heard it may, however I do not know for sure. Was using it in a 300 RUM and had a load at 2830 FPS. 700 rounds on the barrel and it was throwing shots so figured the barrel was done. Ran the load over a chrono to be certain and it had dropped 100 FPS.
How many rounds on your barrel/what cartridge?
People like 8 pounders for the quantity (me included) but prefer 1 pounders so only one is open at a time.
How many rounds on your barrel/what cartridge?
People like 8 pounders for the quantity (me included) but prefer 1 pounders so only one is open at a time.
I'd suspect it's erosion…. Have you bumped the charge up?
highfinblue
Well-Known Member
It is a very erosive powder from everything I've heard. The man that built my 28 Nosler told me I'd have to keep an eye on the throat of my barrel and lengthen seating on my bullet to compensate over time. I don't shoot it much for that reason and use other cartridges and rifles for practice only shooting the 28 a few times a year saving it for hunting.
Try leaving the bullet where it is, and increasing charge weight to get back to your original velocity. May need a longer drop tube or some good vibes but that's no issue.
Good luck!
Just make double dog sure you only make a change in one area at a time..
Good luck!
Just make double dog sure you only make a change in one area at a time..
Barrels typically speed up over the first couple hundred rounds then begin slowing the last couple hundred until accuracy drops off signaling time for new barrel. Might look like 200-500-100 with n570 on a magnum caliber.
Shane Lindsey
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Exactly how my RUM went. Almost N570 exclusively...
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