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KC Hope you have more days off :) Thanks for posting. Ken

Hey Jim, Not trying to diminish tuners or their ease of use but it is nice to at least see the big picture. Take Care Ken

Not sure. If I understand what you are saying is a less dense bore air increases muzzle velocity which to me seems contrary to the Pressure Exponent factor whereby a less dense air in front of the bullet (less confinement) would lower pressure and burn rate. - Negligible value. As I see it...

Great work on facilitating the method of adjustment on tuners! Air in the barrel thinning throughout the day - I have flipped my thinking on this one a couple of times but for our type of gun I do not believe that values are much more than negligible. Not the Air Shock Resistance found in...

Boyd, Possibly some RF powders are less temperature sensitive than the powders we are used to looking at. To me finding and keeping tune is not a one size fits all and it’s more about initial burn rates. Tuner or no tuner you have to know your powder, primers, bullets et cetera. Ken

I have never used a tuner but back a number of years ago I stumbled on a good lot of powder, primers and bullets and I managed some pretty decent groups at a local winter league. My understanding is that there is a larger temperature coefficient at higher temperatures. Ken

As I see it and take it for what it’s worth you are correct in that it is the powders temperature that has the primary influence on burn rates however moisture not only reduces the powders strength it also reduces sensitivity through ignition and flame spread delays. So even pre-loaded (with...

By luck I was just getting started Benchrest in 05 and had the privilege of a special invite from JB. At the 05 Super Shoot I loaded in his trailer were I was also introduced to a number of his close friends including JJ. Since that time for better or worse I have been hooked on the study of NC...

Question: Should I take that to mean Temperature is the only atmospheric condition that changes burn rates?

Related to dew point or relative humidity I agree there is a definite relationship between Relative Humidity and Dew Point and that both are indicators of the amount of moisture in the air. Relative humidity is given in a percentage, not so easy to work from and relates only to the vapour...

As I see it and, I know little of what I talk but, other than having the best of the best equipment and components; it’s all about finding the friendliest condition and, - Speed. Especially at 200.

No Doubt… To put a value on the different characteristics on NC in relation to the properties of a loaded round is nothing less than stochastic.

I’d be curious as to whether the average deviation in velocity had the same values between different powder types eg 133 / 4198, or between different cartridges.

Allie Euber Bullets, No. Orwell Road, Orwell, VT 05760, (802) 948-2621.

Hey Jim, Thanks........... The only powder I am seeing these days is white. And a Merry Christmas to you!

But then, there is always Canada. You guy's be nice or I will ask my Liberal government to send down a little Polar Vortex.....

I am not seeing your – kinda sorta – similarity; how is a phase reaction of a liquid similar to the flowability of a powder? Ken

Burn Rates There are numerous ways to characterize powder Burn Rates - Initial, Linear, and Apperent etc. I break it down into two events the initial and the regressive burn that you describe. Ken

A change in distance the bullet travels before obturation will change the initial burn rate of the powder by changing the start pressure; through - the amount of blow by produced. This changes the location of the peak pressure on the pressure curve and bullet position in the bore / barrel time...

Harold, you have mail.