Has anyone chronographed the speed of a 155gn bullet through a 30" barrel?
I am using 45.8gr of 2208 with a Dyers HBC projectile, and would be interested to know roughly what the muzzle velocity would be (I don't have access to a chronograph and don't really want to buy one). For any calculations for elevation adjustment etc I am working on 2950fps, but no idea how close this is.
Muzzle Velocity of .308 with 30" barrel
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Hi,
Yep did exactly that testing a couple of weeks ago with the same load, powder & barrel.
I used my cheap Chrony & got speeds of 2917, then used a top of the market chrony (3 sensors) with same loads etc & got 2935 average. The second test was on a different day and temperature etc. The batch of 2208 I have now is a lot slower than my previous batch by a long way. I'm looking at at least .5 gns more new powder to achieve the speed of my old 2208.
hope this helps.
Cheers
Yep did exactly that testing a couple of weeks ago with the same load, powder & barrel.
I used my cheap Chrony & got speeds of 2917, then used a top of the market chrony (3 sensors) with same loads etc & got 2935 average. The second test was on a different day and temperature etc. The batch of 2208 I have now is a lot slower than my previous batch by a long way. I'm looking at at least .5 gns more new powder to achieve the speed of my old 2208.
hope this helps.
Cheers
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