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View Poll Results: 100% Poweder burn in Barrel - Desirable?
Yes 35 85.37%
No 6 14.63%
Voters: 41. You may not vote on this poll

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100% powder burn in barrel - Desirable?

 
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  #1  
Old 03-29-2014, 10:33 AM
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100% powder burn in barrel - Desirable?

I searched and there was a little discussion on this.

My sort of educated guess is that 100% burn is preferred at somewhere around 95% of barrel length.

Do I have this concept understood or is there something I don't know?
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Old 03-29-2014, 11:28 AM
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Re: 100% powder burn in barrel - Desirable?

How would one measure this ? A high speed video and "quantify" muzzle flash ?

Typically if you need to run compressed loads AND the bore is black after each shot, the powder you are using might be a bit slow. It need not be a problem unless you let the rifle get too dirty. My 6.5x284 with H4350 seems to be sootier than anything else I have loaded, but good accuracy so far and I'm only part way through load development.

Too much snowmelt and slush to either shoot at the range or on the farm right now. I don't like icy mud baths....
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Old 03-29-2014, 09:09 PM
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Re: 100% powder burn in barrel - Desirable?

I ask from the 'educated' position that QuickLoad provides.

Some of my accurate loads are estimated to be %100 burn in barrel and some not.

The easier to develop loads were estimated closer to %100 percent burn.

Trying to get more data and discuss.
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Old 03-29-2014, 11:27 PM
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Re: 100% powder burn in barrel - Desirable?

Quote:
Originally Posted by jfseaman View Post
I searched and there was a little discussion on this.

My sort of educated guess is that 100% burn is preferred at somewhere around 95% of barrel length.

Do I have this concept understood or is there something I don't know?
Quote:
Originally Posted by jfseaman View Post
I ask from the 'educated' position that QuickLoad provides.

Some of my accurate loads are estimated to be %100 burn in barrel and some not.

The easier to develop loads were estimated closer to %100 percent burn.

Trying to get more data and discuss.
I think your thinking is right on. I'm no expert but I try to get 100% burn in the barrel finishing just before the bullet leaves the barrel. That generally is not an easy task but is achievable depending on powder choice.

Quick Load gives an estimate and I have always gone by that. At the moment I'm working on a load for a 300 WM that is being built using IMR 7828 and 215gr Berger's. What I will probably work up to is 102% fill and 99.91% burn in a 27 inch barrel according to Quick Load and see what I have. If I bump the barrel to 28 inches it gets worse and the same if I drop back to a 26 inch....go figure. Things could change as I'm still knocking things around waiting for the barrel.

I also usually get the best results when the powder burns 100% within the barrel but also the fill needs to be close to 100% or slightly compressed. Just my armature take on it.

I see you are from the Central Coast...what part? I grew up in Arroyo Grande.
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Old 03-30-2014, 03:27 AM
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Re: 100% powder burn in barrel - Desirable?

Three reasons to design for higher burn percentage:
1. It represents a pressure curve that is more consistent
2. Lower muzzle pressures means less slap to bullet bases, at various angles
3. Less powder adding to traveling bullet mass means less recoil

There is a lot more to this than simple barrel length.
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Old 03-30-2014, 05:11 AM
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Re: 100% powder burn in barrel - Desirable?

I voted yes ,but only because a "no vote" might suggest it was undesirable. A complete powder burn has never been a priority in my load development. I agree with the benefits that have been stated in the prior posts but I wouldn't trade them off against my criteria of accuracy, low ES, and desired terminal ballistics(on target energy/retained velocity) I'm not sure I have always had a complete burn with my loads, but then again, I tend to follow established load recommendations. iMO.
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Old 03-30-2014, 09:24 AM
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Re: 100% powder burn in barrel - Desirable?

Quote:
Originally Posted by kcebcj View Post

I see you are from the Central Coast...what part? I grew up in Arroyo Grande.
I was in Arroyo Grande 3 days ago. Had some clam chowder at the Splash Cafe in Pismo then an ice cream at Doc Burnstein's (used to be Burnardos). Growing up in NorCal and my grandparents living in SoCal we used to meet half way every year and celebrate Thanksgiving at Lopez Lake. Love that area of the state but it sure isn't anything like it used to be.

I don't have QuickLoad. Could someone tell me what the burn percentage would be for a .308 Win with a 20" vs 24" tube using 44.5 grains of Varget under a 150 or 168 grain bullet? Sooner or later I'm just going to chop the barrel down just want all the facts before I do. I'd hate to cut it and then be mad at myself for buying 8lbs. of Varget that might not be ideal for a 20" tube. Wondering if perhaps the lighter powder charges associated with a heavier bullet might be better suited for shorter tubes? In other words 42 grains under a 180 vs 45 under a 150 might have a better chance of full burn in the shorter tube.

Thanks
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