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Acceptable FPS spread

 
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  #1  
Old 01-31-2011, 07:32 AM
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Acceptable FPS spread

Just got a new Chrony! Went and check the velocity on my 300 WBY. What would be considered ok FPS spread? Mine came in at 60 FPS this was a 10 shot group. All brass was processed normally. No sorting by head stamp or weight just resize trim to length and go.

Thanks in advance Muzhunter
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Old 01-31-2011, 08:19 AM
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Re: Acceptable FPS spread

Quote:
Originally Posted by muzhunter View Post
Just got a new Chrony! Went and check the velocity on my 300 WBY. What would be considered ok FPS spread? Mine came in at 60 FPS this was a 10 shot group. All brass was processed normally. No sorting by head stamp or weight just resize trim to length and go.

Thanks in advance Muzhunter
I like to get less than 20 to 30 ft/sec Extreme spread and Standard deviations of under 10.
10 to 15 is good for SDs.

These are not easy to get but are possible.

For 100 to 200 yards 60ft/sec will work but when you extend the range you will need to
improve it to prevent vertical stringing.

If you shoot 10 rounds in a row (Without Cooling between shots) make sure that the round
doesent stay in the chamber long (Cooking) before shooting it.

J E CUSTOM
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  #3  
Old 01-31-2011, 08:40 AM
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Re: Acceptable FPS spread

I agree with the above...We shoot for single digits on our LR rifles.
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Old 01-31-2011, 08:45 AM
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Re: Acceptable FPS spread

I look for an ES of 10 or less.
At long range a big spread will show lots of vertical.
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Old 01-31-2011, 10:27 AM
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Re: Acceptable FPS spread

the big Weatherby case likes heavy dense loads, and that may be part of your problem. Also you didn't say how you had the chronograph setup. The muzzel blast from a .300 WBY. is fierce! If the screens are moving from the blast you may well be getting a variation from that alone. A good test would be to move the chrongraph down range another ten feet. If you see the same variation then you know it's in the actually rounds themselves. What is you load data?
gary
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Old 01-31-2011, 11:44 AM
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Re: Acceptable FPS spread

Don't get too wrapped up in what your chrony spits out at you. I was solely looking at the numbers when I was load developing my 7 SAUM. I ended up wasting time and components. If a load shoots good groups at 800+ yds then your fps spread is going to be low. IMO use your Chrony to get an estimate on your velocity, and your groups to choose a load. Good luck.
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Old 01-31-2011, 03:43 PM
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Re: Acceptable FPS spread

My load is 180gr hornady interbond, 85 gr IMR7828 SSC. I did not notice the chrony moving after the shot. I would shot 3 then let cool for awhile then repeat.

I always get groups under an inch at 100yd. Here is a copy of the data.

If I could attribute the one flyer to a special cause it would shrink the STDEV to 11.0.
I don't feel good throwing it out

180gr / 85.0 IMR7828

3348
3343
3352
3351
3377
3352
3347
3335
3356
3397

AVG 3355.8
STDEV 18.05424
MAX 3397
MIN 3335


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