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velocity spreed

 
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  #8  
Old 02-13-2011, 10:45 PM
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Location: Idaho
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Re: velocity spreed

I went to the range today I increased my load by 1/2 GR my ES came down to
22.51FPS and the groups still look good the only issue I have is Im 1/2 gr over the load data max but not showing any signs of presssure
It was only 50 degrees today may try it again in the summers when its hot.
retiredcpo
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  #9  
Old 02-13-2011, 11:31 PM
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Re: velocity spread

Powder charge changes are the biggest determining factor in changing ES/SD.
All of the other things will fine tune it.

What cartridge, powder , bullet, oal are you using and what numbers did you get at other powder charges?

I work up to a max load by using velocity, case head expansion, primer condition, bolt lift,extractor marks or lack thereof. As well as temp, OAL, whether it is on the lands or off and of course published data and my quickload data.

Sometimes MY max powder charge for a particular combination is well Below book max.
Case in point was a savage 270wsm. With 140accubonds and imr 7828 I was 2gr below published max as my max in my particular setup. I was well off the lands too!

Sometimes MY max powder charge for a particular combination is Above published data.
Especially when I am loading to a much longer and still off of the lands.

Even different lots of the same powder may have a different max charge. Different case capacities of various brass,primers, etc.

Every rifle, bullet, powder combination is different.

I mostly test at 565yds and want a load with a 1.5 inch so of vertical at that distance.

I guess it was a long winded way of saying to try different powder charges.
You may find a great load lower or maybe even higher.
Just stop when you should and don't push it too hard at the top.
I work up pretty high and I have never had to bang on a bolt to open it or had a primer blow out.
It looks like you are doing things right, you should be able to bring the es down at least another 10 or more fps.

Last edited by RockZ; 02-14-2011 at 11:14 AM.
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  #10  
Old 02-14-2011, 08:33 PM
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Location: Idaho
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Re: velocity spreed

Rock
have several loads we are working on the one I have been refering to
is a 7mm remington mag 160 gr Accubond with 60 grs of 4831sc win brass and primers OAL is 3.375 which is way off the lands now9it will be time for a new barrel next year probably.
I know this is a good load and a safe one I have been shooting it for over a year now even when it was hot outside pushing 100 degrees.
I ask the question for two reasons
1-to try to understand what the chrono data is telling me and how to use it to better my loads
2- to try to learn what I can do to try to better things with out changing to much
I may try some lighter loads just to see what happens
Differant guns are extremly differant
My 223 load has a SD of 55 FPS Im helping a buddy work up a load for a new gun the same load in his gun has a SD of 8.0 FPS the only diffeance is his is 0.010 shorter. Thats a huge differance for just changing guns
retirecpo
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  #11  
Old 02-14-2011, 09:50 PM
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Re: velocity spreed

You are right.
It is amazing what differences there are in loads and different rifles!

I'm sure you can reduce your spread by working up.
It looks like you are well off the max load for the 160AB and 60gr of H4831SC.
At 60gr you are getting a low fill rate as well
I checked some numbers :
With your oal Quickload gave me a max of 67gr.
Hodgdon gave 64 gr for 162gr HDY SPBT
Sierra gave 63.6gr with their 160gr bullets.
I read online that Nosler max was 65.0, but don't have their manual so can't confirm.

Of course these numbers are just a guide, but they do suggest you have plenty of room.

I would suggest to work up in .5 grain increments over the chrono.
You should find a load as you work up that will offer a lower es/sd.
It may even be in the 63.5 range, but work up slow as you have been doing and you should find it.

Don't let the 100yd accuracy get you stuck on a load.
Unless you are getting very little vertical at long range.

If you are shooting 2" groups at 600yds , the load is fine!

Then it could be a chrono issue as mentioned before.

I have a load that puts 3 bullets in the same hole at 100yds. But has an ES of 40 and shoots a huge vertical at 600yds.

My load with the least ES, 9 fps, is 3.5 grains higher and is nearly at my max.
And only has 1.5" vertical or less at 565yds.

I think you will have great results as you work up.
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  #12  
Old 02-14-2011, 11:04 PM
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Location: Idaho
Posts: 580
Re: velocity spreed

Rock
Thanks so much for the info
I may work this load alittle more but I think i would prefer to do it when its hotter outside
Im fearfull of working up a lot in the cold then shooting in the summer way to hot.
but it gives me something to do between vamit hunting and deer hunting.
The case are not very full with this load.
retiredcpo
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  #13  
Old 02-14-2011, 11:48 PM
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Join Date: May 2008
Location: South of Canada and North of Wyoming
Posts: 5,954
Re: velocity spreed

I have a 1 yr old Chrony Alpha and a 20 yr old abused Shooting Chrony. When I set them up back to back, they are anywhere from 5 fps to 60 fps different with no consistancy in the difference. That was a real eye opener. I "think" the 20 yr old Shooting Chrony is actually more accurate. I'll be getting a CED M2 soon and shoot all three of them back to back to get a better idea of what's going on.

That being said, I think chronys are useful tools, but I don't beleive them 100%. I consider their info to be relative and not absolute.

Some good tips and advise on reloading, etc... and if you're getting consistant sub MOA @ 1K, I would say that was pretty good.

-Mark

Edit: I have also seen very significant swings (close to 100 fps) from morning to afternoon to evening and cloudy vs sunny FWIW

Last edited by MontanaRifleman; 02-15-2011 at 12:00 AM.
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