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I've been wanting to check the speed of a few reload recipes a friend and I are using so yesterday we set up the chrono and started shooting 3 shots each of the various loads. Temp was 34* and we were using a 34" barrel on the gun. All loads contained 1-1/8oz shot.

load #1. Rem. STS hull, 19.8grs Green Dot, Versalite wad, Rem 209P primer. The average velocity for this load was 1235fps which was about what we expected.

load #2. Rem. STS hull, 21.9grs IMR PB, Versalite wad, Rem. 209P primer. This one surprised us with an average of 1262fps.

load #3. Fed. GM hull, 20.5grs Green Dot, Fed. 12S3 wad, Fed. 209A primer. This one really got our attention...1278fps.

load #4. old style AA hull, 21.9grs IMR PB, Versalite wad, WW 209 primer. Again, this one was faster than expected... 1264fps.

load #5. Fed. GM hull, 19.5grs Green Dot, 12S3 wad, Fed. 209A primer. Average speed was 1208fps.

load #6. Factory Remington Premier 3dr load bought at the 2010 Grand. 1249fps.

Most all of these seem a bit fast, especially when printed data for some of the loads shows a 1200fps speed. Anyone else see results like these? Oh, that PB is a fantastic powder, just wish it wasn't so expensive!
 

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Take about 35fps off what you recorded and you're right in the ballpark. The chrono is only reading the first few pellets not the core. The core will be a little slower.

Neil Winston did a good write-up about this a few years back.

ss
 

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Yes, I remember the thread about that! Thanks for the heads up, now I know our loads are about where we wanted/expected them to be.
 
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