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powders and primers

 
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  #1  
Old 09-05-2011, 07:30 PM
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Location: Bend Oregon
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powders and primers

Any one have advice on some reloading stuff, I am shooting noslers 140's in a 260 rem, using h4831 with different weights,43, 44,45,46, I found the 45 gave me the lowest ES at 24-25 fps, and a SD of 9.45, at 2856 av speed,at .465 " is a sample of 10 shots enough?

I tried some Ramshot hunter with these bullets and got over 100 fps differences at 44 and 45 gr weights, looks like the H4831 is much tighter. the 45 and 46 gr are a bit compressed, working within my COAL.

I have shot about 50 rounds overall with the 45 grains and average under a half inch ,with some groups in one basic hole.

When loading for long distance should one initially shoot for low ES and SD regardless of accuracy and not be checking accuracy as you go( to save time?)

1 so whats a good way to match up primers with powder?

2 do you worry about cleaning the barrell between shots or groups of shots to keep things the same?

3 how about barrel heating? how long b/t shots?

4 when doing fine tuning with the powder how much should you increase/decrease powder to find the best weight so if 45 is pretty good should I try to go up in tenths of a grain or more at a time?

5 any influence from primer seating depth?

Thanks again in advance Scott

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Old 09-05-2011, 09:06 PM
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Re: powders and primers

With a 25fps es that could grow to 100fps at 500yrds and that's not good, try Imr4350, keep even neck tension, and play with seating depth. Try keeping your groups as small as possible but get your es in the single digits, less than fps if you can.
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Old 09-05-2011, 09:15 PM
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Re: powders and primers

whats a reasonable fps variation measured at the muzzle?
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Old 09-05-2011, 09:23 PM
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Re: powders and primers

1-3fps awesome, 4-7fps great, 8-10fps good, 10-15fps ok, 15fps + try again!
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Old 09-05-2011, 09:31 PM
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Re: powders and primers

thank you for the advice i will try again
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  #6  
Old 09-05-2011, 09:34 PM
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Re: powders and primers

I thought I was pretty meticulous , its a factory savage shooting about a 1/2 inch at 100, what else could i do? using forster dies and new brass cci br primers any thoughts? thanks again Scott
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Old 09-05-2011, 09:42 PM
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Re: powders and primers

Quote:
1 so whats a good way to match up primers with powder?


There's no brilliant way. All you can do is choose a primer and a powder and if you do not get the results you want, try a different primer or powder. The key is to only change one thing at a time so that you can measure the effect of the change.

Quote:
2 do you worry about cleaning the barrell between shots or groups of shots to keep things the same?


The only time I worry about barrel conditions is if the rifle starts out clean. I like to shoot a couple of foulers before starting to measure my test ammo.

Quote:
3 how about barrel heating? how long b/t shots?


I generally take a minute or two between shots.

Quote:
4 when doing fine tuning with the powder how much should you increase/decrease powder to find the best weight so if 45 is pretty good should I try to go up in tenths of a grain or more at a time?


Generally speaking, make 1% changes in powder charges. For for instance, your loads are all in the 40+ grain range. I would make .4 grain changes e.g. 44.4, 44.8, 45.2, 45.6 etc.

Then if you find a load that seems to work well, you can try .2 higher and .2 lower

Quote:
5 any influence from primer seating depth?


Not sure. Have never experimented with different depths. Always seat primer to the bottom of a uniformed pocket.
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