Which tweak should be next?

[Buck Fever]

If you want to make it accurate at long range, make batches of your best few loads and shoot them at 500 yards to see what happens. Sometimes your best at 500 won't be your best at 100.

 

[Mikecr]

He can find best seating at any range.
He's not tuning the load yet.

There are 3 separate and distinct phases of load development.
1. Prerequisite. Primers striking, bullet seating, case forming & sizing, annealing plan, bag/rest/balance, etc..
2. Powder Development. This is OCW, hot precision, or cold bore accuracy, etc.
3. Barrel Tune. Either with a barrel tuner, or departing from OCW with a ladder/ILD for tightest precision at a set range.

Nothing is range specific until barrel tune.

 

[C-130 Dude]

I get it…and I agree with you, really…. I guess I feel willing to put in a little more testing? The other side of the coin is, if sub-MOA holds at 5-800 yards, I'd be plenty happy. Sometimes I get too caught up in that "5 rounds/1 ragged hole"…I guess part of me would like to do that just once!!

Your time, your money! It's all good.

 

[dogz]

Ranges at which this gun will be used (on game) on a yearly basis?

Lastly, like many others I'd go .40 and deeper, maybe try another powder.

Once you get one that perks, then go and shoot 3 groups and see if it holds true