Just thought I'd give a quick thanks to Rex. The videos made me think a bit and get back on target the next shot.
A little history (you're not going to like this)... I thought I'd try to prove something and assemble more or less the cheapest rifle I could and see how well it could shoot. It ended up being:
Howa 1500 in 223 1-9" complete with rubbery hogue stock
Caldwell XLA 6-9" pivot bipod
Nikko Sterling 6x40AO mil ret/moa adj
Home made cheek riser from crafting foam, cohesive bandage, buckle tie downs, and some second skin left over from my army days.\
Shooting 'Aussie Outback' factory loaded 69gr Sierra HPBT
All in all it owes me less than $780 AUD as it sits ready to shoot. Quite the cheap setup.
Most of this will change soon, however I figured why not give it a shot and see how it goes... Long story short, from virgin barrel during break-in, shots 6-8 were about 1/2 moa group in horrid wind. Shots i think 9-14 were about 1 moa in an almost perfect chevron. I was doing some bad things at that point I'm sure.
Anyway, long way to get to the point. I got bored so started lining up clays (on the butts), smack bang on for the first 3 in fairly quick succession, shot 4 comes along took a little longer to line it up and splash just over the top. Thought to my self, what the hell? Then something that was covered in one of your videos registered, held the next shot half mil low, boom! no more clay. took the next one out same deal, half mil low, no more clay. Thought I'd try a different approach for the next shot and lined up before chambering, did a quick chamber/shot sequence and shot and held true, no more clay.
Goes to show, even with the ADI ballistic temperature insensitive whatever powder, leaving the round in the chamber too long will certainly shift the point of impact.
Can't wait to get out again on a not so windy day and get a true zero.
Side note if you get this far, when you put the stupidly cheap LR setup together, did you think about using the Howa (Weatherby Vangard) barreled action?
For some reason that lesson was never taught in the infantry. Go figure...