I am brand new to reloading. I have a Forster Co/Ax for precision .308 and yesterday I bought a XL650 from Brian to load 9mm, 38 Special, 357 Mag, and .223. I have all I need to make some ammo. This weekend, I'll likely start. Let's talk .308 for now because it will be a week or so until the XL650 is installed and ready to go. I have a Remington 700 .308 20inch AAC that I plan to shoot this out of. The brass was first shot out of this rifle. I even attached a picture of it.
So I have my trusty Lyman book with safe loads and max loads. I have once fired Winchester brass, deprimed, and clean. I have 175gr Sierra MatchKing BTHPs. I have 8# of IMR4064. Lyman says to start with: 39.5 grains of powder and a max of 44grs of powder.
The premise is that I need to find a load that my rifle likes, the goal is not to blow it up and injure myself.
So I started to think, what do I do.
I was thinking of starting out and making 4 rounds at 39.5, and then 4 rounds of 39.6, and then 4 rounds of 39.7, etc.
Then I would go to the range, get my trusty Chrono out, and shoot a 4 round group, get speeds, capture my group lengths, and check my cases when I got done.
Then magically it will come to me that (for example) 39.8 grains or 40.1 grs shoot great and tada, I haver the recipe that I will make for as long as I have the gun?
Am I naive? better stated... I am naive... right?
How should I approach this?
I scoured the FAQs and I didn't read anything about building a load. Also, not in my reloading Handbook except for the following on page 95 of the 48th edition:
All this simply gets you through the door to the
party. Now the fun starts and we get to make some
noise. Shoot this ammo carefully from a bench rest to
evaluate accuracy. Try moving the powder charge up a
little at a time to see if groups tighten or open up. If
you are not at maximum, keep going because sometimes
they will open up with a change and then close
tighter as you move the charge weight higher. Watch
the standard deviations on your chronograph to see if
they are getting smaller or larger. Smaller is good as
smaller standard deviations usually indicate more
accurate ammo. But larger, particularly a rapid jump
with just a small change in powder charge, might
indicate that pressure is at maximum. Sometimes large
standard deviations can be reduced by changing
primers. Particularly if you go from a standard to a
magnum primer. However, reduce your powder charge
5% if you do because the magnum primers will cause a
jump in pressure.
Once you have the best powder charge, experiment
with bullet seating depth to see if accuracy is
improved. Move the bullet in .005-inch increments
and shoot to see if accuracy gets better or worse.
That isn't all that helpful. Can you guys add some of your own experience on how I should begin or how you would approach it.
-Torrentuser aka Lox