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 01-08-2018, 07:05 Post: 120112
harvey



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 Using a Chronograph

This original thread got lost

DennisCTB 9/20/2007






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 01-14-2018, 00:30 Post: 120147
NOMOREGEARS
2018-01-14
Post: 120147
 Using a Chronograph

I've been tempted to buy one of them. What kind did you get? Do you need the balistic software no that you have that? I do quite a bit of reloading and from what I hear I'm blind without one. Dam blind guy hitting a dime at a 100yds. Imagine that. Anyway, you load deviation sounds high from what I hear.
I weigh every load, every casing and every bullet. Cases and bullets are broken up into lots. Are you using the same type of casings? Case volume may account for your variation in velocity.






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 01-14-2018, 05:24 Post: 120148
harvey



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It's the Shooting Chrony Beta. I got it form Midway. It do not require software and it has the bench top meter.

I am not certian why such a variation of fpm. Some of it might be temparture. It was 20 out and first rounds of string, cold barrel, are slower, 5th rd of string faster. Warm chamber?. The temp warmed to 35 by end of session. The speeds picked up the 2nd half of session. I fired a complete gpoup of 5 rd lots, 8 lots or 40 rds. I do not clean and the 2nd half with same loads was faster.

All components are identical and each charge weighed.

Currently I am only loading to find a accurate load for the 250. With 40, 50 and 55 gr bulletts. I'll get the ballistics software later.

The most preplexing issue in none of the loads even come close to the load manuals fps.

I have 90 or so rds loaded for testing today if the weather will cooperate. Of course it is 0 deg this am.






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 03-01-2018, 10:30 Post: 121330
DennisCTB



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 Using a Chronograph

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