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Load development ?

 
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  #1  
Old 04-28-2012, 02:08 PM
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Load development ?

Sometimes there are thing that make you go HMMM??
I was asked a question the other day and it has me going HMMM?? Maybe you got something there.
Here it is... When you do your load development do you let your barrel completely cool ? What if it is a load you are working on for tournament shooting when you have "x" number of rounds to fire in a set time period? Do you think that it would be better to shoot your rounds for load development the same as you would for a shoot with a set time limit where your barrel is going to heat up anyway and shoot a higher number of rounds at each powder charge?

What do you think?
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  #2  
Old 04-28-2012, 06:01 PM
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Re: Load development ?

Hmmm
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  #3  
Old 04-28-2012, 09:09 PM
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Re: Load development ?

I develop and test loads -as used in the field.
It doesn’t mean I have to shoot 5-10 shot strings at each iteration of change, when 3 round-robin will get me in the ballpark. But eventually I’ll need to confirm that I can do EXACTLY what’s needed.
For group shooting competition, I would develop with appropriate barrel cooling to prevent unnecessary damage(30-60sec shot rate for mid size cartridges), and then tweak the load to produce needed group quick enough for conditions. This, off the bench rest and bags that will always be used.
For cold barrel accuracy, I use 30-60sec rate in development, and then tweak for results needed at far lower shot rates(like days, hours, and finally 10mins[the very worst in performance]). This, off a bipod in calibrated dirt.
(just kidding)
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Old 05-06-2012, 04:33 PM
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Re: Load development ?

Just had 7mmRHB fix a few issues that the custom builder botched on my 6.5x47. 7mmRBH asked how I was going to shoot my rifle; meaning how fast or how hot was I going to allow it to get. He likes to place a pad or upward pressure under the 1st 1" to 1-1/2" of barrel to dampen vibrations. This is better for accuracy but can start to destroy it if one lets the barrel heat up. I asked him to place the pressure pad as this rifle was built for hunting and should not see any sustained heat in the barrel. Well, just the other day while working on some load development, I would shoot 3 sets of 15 shots in 5-shot increments. The first 5 were from a cold barrel. I would then go on to shoot the next 5 while the barrel would stay warm and the next 5 not letting barrel cool at all. It got hot. The groups were as follows.

6.5x47 Lapua
Nosler 140 gr CC
40.3 gr H4350
CCI 400

These were 5-shot groups but I marked the best 4 and then 5th shot.

CCI 400 2825 av Cold .42"/.9"
3.130" dead 22 ES Warm 1.2"/1.2"
15 shots 5 SD Hot 1.1"/1.84"
2.89 bushing

CCI 400 2831 av Cold .66"/1.17"
3.130" dead 36 ES Warm .57"/.82"
15 shots 8 SD Hot .7"/.88"
.288 bushing

CCI 400 2827 av Cold .78"/.84"
3.130" dead 31 ES Warm .86"/1.02"
15 shots 9 SD Hot 1.3"/1.63"
.287 bushing

7mmRHB suggest total free float if the barrel is expected to get hot.

Alan
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  #5  
Old 05-06-2012, 06:15 PM
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Re: Load development ?

Two questions Alan;
What temp do you NEED the gun to shoot at?
Why are you adjusting bushing SIZE?
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  #6  
Old 05-06-2012, 06:28 PM
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Re: Load development ?

I had been using the .289" bushing which gave me .001" neck tension. 7mmRHB suggested a tighter bushing, saying my groups might tighten up with around .004" neck tension. I happened to have the two next smaller bushings so what I posted is the results of the test. A side result was the increased heat test.

I was shooting at 65 Deg F but I'm not sure it matters. Keep the barrel as close to ambient temp as possible. I was shooting the "cold" groups with 2-3 min between shots. The "warm" temps about 1 min apart and the "hot" temp groups as fast as I could run the bolt, reacquire the target and squeeze the trigger.

Alan
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  #7  
Old 05-06-2012, 07:23 PM
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Re: Load development ?

A tighter bushing doesn't change tension. Sizing LENGTH does this.
By temp needed, I meant will you need the barrel hot/med/or cold in the field?
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