Is it possible, 165 gn @4200 fps.?

Discussion in 'The Ammo & Reloading Forum' started by Domino300, Jun 10, 2012.

  1. Domino300

    Domino300 New Member

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    I bought a used Weatherby Vanguard 300 Mag with a couple partial boxes of Wby.ammo. I took it out to sight in with a box of 10 w/ 165 gn. spire points and my Comp.Electronics Chrony. The first 5 shots registered: 4077,4040,3267,4219 and 4232 fps. I thought maybe the chrony was off or they were reloaded with maybe 110 gn bullets, but the primers all had the Wby. green sealer on them. I decided not to continue using them and switched to Wby.180 gn spire points which registered just over/under 3200fps. Also shot some 41 Mags which registered normally. There were no signs of excess pressure on the brass or on extraction. Pulled the other 5 bullets and the pills were 165 gn. The powder measured 87.8 gns in all 5 pulls. So would those speeds be possible with 165 gn bullets?
  2. Hammerslagger

    Hammerslagger New Member

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    Sounds too high.

    Was your Chrony at least 15 feet from the muzzle? Otherwise, or even so, muzzle blast may have given erroneous readings.
  3. Domino300

    Domino300 New Member

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    Chrony was probably 12-15' away.
  4. JLA

    JLA Moderator

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    yeah somethins not jivin. BAck the chrony up to 20 or 25 feet. the .300 wby has significant muzzle blast compared to the others.
  5. Domino300

    Domino300 New Member

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    OK, thanks for replies. Don't know what powder was in them, but 87.8 gn seems like a lot, but the 4000+ fps would be unreal.
  6. JLA

    JLA Moderator

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    87ish is about right for 165 gr .300 wby loads.
  7. Hammerslagger

    Hammerslagger New Member

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    I would infer that the bullet is tripping the first sensor. Then the muzzle blast trips it again. Then the bullet trips the second sensor; and you end up with the erratic, too fast readings that you reported.
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