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Load testing intervals

 
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  #1  
Old 09-04-2012, 01:04 PM
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Join Date: Jul 2009
Location: Sacramento, CA
Posts: 288
Load testing intervals

I have been testing my loads as such for a 300 Win, with a 190 berger, and a factory berrel.

1. Have clean berrel, and shoot foulers until my groups stabilize.
2. Shoot first group of test loads.
3. Wait until my berrel feels somewhat coo again, maybe 7-10 min
depends on outside weather.
4. Shoot second group of test loads.
5. Repeat until done.

I know this is all personal preference, but I just want to make sure I am using a correct method so that I get accurate feed back from my load testing.

Thanks
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  #2  
Old 09-04-2012, 01:35 PM
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Join Date: Jul 2004
Location: Texas
Posts: 5,598
Re: Load testing intervals

Quote:
Originally Posted by Firearrow View Post
I have been testing my loads as such for a 300 Win, with a 190 berger, and a factory berrel.

1. Have clean berrel, and shoot foulers until my groups stabilize.
2. Shoot first group of test loads.
3. Wait until my berrel feels somewhat coo again, maybe 7-10 min
depends on outside weather.
4. Shoot second group of test loads.
5. Repeat until done.

I know this is all personal preference, but I just want to make sure I am using a correct method so that I get accurate feed back from my load testing.

Thanks
My method is to = clean and dry patch,shoot one fouling shot, Shoot 5 test loads (Unless there are
bad SDs on the first couple of rounds) clean and dry patch and let cool (5 to 10 minutes) the shoot one fouling shot and shoot 5 different loads.

I repeat the cleaning and shooting 1 and 5 until testing is done.

Note: the reason for cleaning between each group and shooting one fouling shot is to compare
apples to apples.

After the best load is found I then =clean and dry patch and shoot up to 10 rounds to see where/if the accuracy falls off.

Just the way I do my load testing.

Hope this helps

J E CUSTOM
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  #3  
Old 09-04-2012, 02:24 PM
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Join Date: Apr 2010
Location: Allen, TX
Posts: 2,608
Re: Load testing intervals

For me, it depends a little on the barrel and conditions.

A good methodical approach as described above is always best when feasible.

I don't have a range out my back door anymore.

So, I try not to waste range time. Also, I want to get my shooting done before conditions change materially.

That said, I try not to be hasty.

If I'm getting good results/feedback, I forge ahead.

If things aren't going as expected, I slow down and cogitate as to the reason(s).

The key is to verify repeatability as you begin to settle on your load.

-- richard
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  #4  
Old 09-04-2012, 03:53 PM
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Join Date: Apr 2012
Location: The cold part of Montana
Posts: 1,390
Re: Load testing intervals

I never deviate from a few rules

1. shoot round robbin: so that when conditions change (they always do) it effects all loads equally

2. shoot 1 shot every 5-10min to simulate cold bore shots

3. never ever clean while load testing, clean before you start and leave it till all testing for that load is done. The reason I've adopted this is because no 2 rifles foul the same some with one or two foulers is all that's needed others I have can go as much a 10 shots before it settles down, so constantly cleaning and fouling a rifle can turn out to be a huge waste of time and components, and I've never had a rifle foul to the point of accuracy dropping off this way either.

So initially I will do it the same way as OCW, then on the next trip I will usually try different primers being settled on one powder charge, the next trip is usually differing seating depths, though I may change up the order of whats tested when. If I see that a particular recipe is not going to cut it (say load 1 and 2 pattern rather than group), I will skip the rest of those loads or if the heaviest charge is just plainly real hot, better to pull em down and reclaim those components.

This last load I worked up for 168gr Berger SAAMI Hybrid, worked out with less than 30 bullets fired on target. I think it was 22 to be accurate about it, now it's to the verifying stage.
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Joe
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  #5  
Old 09-04-2012, 08:48 PM
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Join Date: May 2012
Location: N.D.
Posts: 3,145
Re: Load testing intervals

The biggest fall-off I've seen in accuracy is a hot barrel. I shoot a fouler and go with it as long as the barrel doesn't get too hot. A couple of my rifles don't even get the luxury of cold bore shots anymore since they do 1/2 moa without it. Oh, and don't mix single base and double base powders without a fouler between groups. It's about like mixing your booze, it can be done at times, but it'll mess things up at times too so why bother.
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  #6  
Old 09-04-2012, 09:06 PM
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Location: Allen, TX
Posts: 2,608
Re: Load testing intervals

You should also clean if switching from one bullet/jacket type to another.
e.g. Scirrocco-->Berger-->TTSX

-- richard
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  #7  
Old 09-04-2012, 09:11 PM
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Re: Load testing intervals

Quote:
Originally Posted by rscott5028 View Post
You should also clean if switching from one bullet/jacket type to another.
e.g. Scirrocco-->Berger-->TTSX

-- richard
+1
yep, that too. Both jacket and powder fouling affect groups and will distort results.

I wonder if there's enough crap(soot) in primers these days to affect the groups; cci used to toss a huge amount of soot years ago, but fed barely had soot.
Can anyone wade into that one???
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