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Feb 12th, 2024
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 Re: FPS without Chrono
[Re: ChadTRG42]
#6482149
10/05/16 05:59 PM
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Joined: May 2012
Posts: 60
Burton Ranch
Outdoorsman
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Outdoorsman
Joined: May 2012
Posts: 60 |
I am not able to get any reading off my Magneto with a suppressor (I assume distance from the bullet is the issue). Does the Suppressor have any effect on velocity? If so, how would you calculate it? Thanks
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Re: FPS without Chrono
[Re: RiverRider]
#6482909
10/06/16 01:47 AM
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Joined: Dec 2008
Posts: 41,173
J.G.
THF Celebrity
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THF Celebrity
Joined: Dec 2008
Posts: 41,173 |
I work up looking for extractor marks. Once the load is decided I shoot to 800. Adjust MV in the calculator until the corrections match what I just shot. So, when you see extractor marks appear, what pressure level do you think you have reached? Have no idea. I've had several rifles that out of a large lot of brass 1/3 to 1/2 have extractor marks. Then I have some rifles that never show an extractor mark. I'm not saying its for everyone, but it's worked so far for me. Last year I was shooting a friend's .338 Lapua Mag, loaded with 300 gr Bergers, and +/- 90 gr of Retumbo. Once we got half way on the test powder charge scale a light extractor mark happened. We kept going, and every subsequent hotter load had a more pronounced extractor mark. I wish I would have taken a picture of those pieces of brass, it was educational. The rifle shot best on the mild extractor marked powder charge, and has shot hundreds of rounds since then without issue.
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Re: FPS without Chrono
[Re: Burton Ranch]
#6482912
10/06/16 01:47 AM
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Joined: Dec 2008
Posts: 41,173
J.G.
THF Celebrity
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THF Celebrity
Joined: Dec 2008
Posts: 41,173 |
I am not able to get any reading off my Magneto with a suppressor (I assume distance from the bullet is the issue). Does the Suppressor have any effect on velocity? If so, how would you calculate it? Thanks Shoot it at distance if you have a turreted scope.
800 Yard Steel Range Precision Rifle Instruction Memberships and Classes Available
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