Best Method Multiple Bullets & Loads Development

[ZenArchery]

Picked up a wildcat barrel, dies, and bullets for cheap. It is a 6.8x39 or 277 Wolverine.
Did a search on the multiple bullets & loads development and couldn't find an answer.

Primary purpose of gun is night hunting hogs at close range under 150 yards and day hunting out to bullet expansion range 250-400 yards.
The platform is an AR15 so 2.250 mag length will be seating depth (thought I will actually check lands/free boar length to throat)

I am going to be loading 3 bullet weights and 2 different powders.
It has been my practice (successfully so) using a .05gr variation in powder weight.
My conundrum is that one of the powders is hard to get a hold of and I don't want to be wasting a bunch of powder to find the best bullet & load for this gun.

I am very forgiving when it comes to hunting gun. I don't need a .25 MOA accuracy. Most of my real hunting scenarios will be under 150 yards day and night.

So my question is what is an efficient way to not waste powder when developing a new load.
Thanks in advance.

 

[BoydAllen]

Pick a seating depth based on experience, and if needed magazine length, and a range of powder charges that you want to explore. For a case of that size, load up pairs with the same charge that are .3 gr apart. Test on a day when the wind is light, with a couple of wind flags, making every attempt to shoot both shots of each pair in the same condition for that group. Pay close attention to pressure signs. A target that has multiple aiming points is what you want to use. Allow enough fouling shots before the test that you remove that variable. The number will depend on the barrel. Do all of your test with a given powder, then clean, foul the barrel again, and go on to your next powder. If you want to work with seating depths, do that after you have determined a decent charge weight.