Burn Rate???

7

7887mm08

Member
Hey need some info on burn rates. Currently loading 7mm-08 using Varget.Shooting a Tikka T3, and a Rem. 788 using 139-140 gr. bullets.I am satisfied with the loads i have worked up, but i want to experiment. On the burn rate chart i have, it lists Varget at #99. thinking of trying imr4895 #87 or imr4350 at#115. Using the same bullet weights what is the "science" or "theory" of going faster or slower on the burn rate chart?
What happens when you go up or down, what should i expect?
Does it chage if the bullet weight changes. Basically i need you to teach me about "Burn Rates" thanks Gary
 
Burn Rates operate in a 3D type environment.

You need to include bullet size and case capacity. Hence, find the right powder for the projectile weight in relation to the caliber you're shooting.

Varget is one of those powders that does well in a lot of different capacities. In my experience, IMR 4350 is no as flexible.

So, to answer your question, I would first determine what weight you want to shoot, and since you have the caliber, check some reloading sources to determine which powder would be a good fit for that load.

At least that is how I approach it.
 
I like to look at the Nosler reload manual and see `what a good fit` is based on Load Density (how well the powder fills the case)and velocity. 7mm-08 140g bullet max load of IMR 4350 shows 100% LD and a velocity of 2840...also shows as *Most Accurate Load Tested (with that particular).(ALWAYS START AT THE LOWER RECOMMENDED AND WORK UP OF COURSE)
Anyway I dont even know why a BURN RATE chart is ever even mentioned....dont do much for me anyhow...maybe someone else can lay some `rocket science` on us???

ETA- I do have a Powder Burn Rate Chart printed out and on the wall in the reload room, and just for instance; hmm ok this bullet worked good with this powder...maybe this little heavier bullet will like this powder thats down a notch or two (slower) on the chart (following published load data of course)...nope..ended up better results with a faster powder
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No one else has comments? Even a link to a good article or something?
 
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