To all who have offered their time and advice in assisting me with figuring out some of these errors I've had in reloading for my .270, here is where I'm at.
As of now, I'm holding off on reloading for this rifle. At this time, considering your advice, I think that I have a few too many things going on here to ascertain in what area I'm losing accuracy with this rifle. I think what I've reloaded to this point technically works in most regards, but to get it to where I want I think that I'm fighting moving water here. Here is how I plan to proceed:
1. I'm going to wait until my new stock arrives. I will bed the bedding blocks and the rear of the action, and verify for a free-floating barrel
2. I am going to double check my primer pockets on my brass, and make double sure that the primer is pressed all the way down into the primer pocket at the correct depth.
3. For the brass, at this point they are once fired so I will be neck-sizing only and bumping the shoulders back .0015 and verifying consistency between casings.
4. I'm going to hold the original base>ogive distance I created in my 1st go around which was .018 off of the lands of my rifle
5. I'm going to develop the same loads using the same charge(s) of H4831sc
6. I will re-shoot a group utilizing factory ammo for a baseline
7. I'm going to get to the range early morning so that I can give my rifle a proper cooling period between groups and increase to a 5-shot group and also implement a slightly different technique with these groups per the advice of a member here.
Once I'm relatively certain that I've mitigated error with the rifle itself (as much as one can anyways) then I will again find the powder charge which gives me the best accuracy. After that I will make adjustments to my cartridge OAL, and once I have the best I can out of that, I will move on to experimenting with different powders and essentially working up my loads again until I have the best results.
I will be sure to report back to you once I have the new stock on and everything is in place and I have these new groups recorded. The turnaround time for my stock is going to be 2-3 weeks since I'm having it made with a custom LOP and several other options included.
Thanks again everyone, I look forward to speaking with you again soon, be it this topic in particular or in other topics on this forum!