It is interesting to note about triggers and personal preferences.
I also prefer 2.5 pound, crisp triggers. I tend to do my best work in that range . However I have found that on my big game hunting rifles, I have had to adjust them closer to the 4 pound range. This is due to hunting in colder temps. Often I don't have much feeling in my fingers. One time years back I made a snap shot on one of the very few elk I have shot at close range in a long time. It was an extremely cold year (
radio station out of Idaho Falls reported wind chill in the -40s and we were in a higher elevation, windier area)and my dad and I had been hiking up some steep country in very windy conditions. We were stopped, looking at a pair of bulls we had jumped (we had cow tags) when he shouted "there" and pointed to a cow looking at us with just her shoulders and head visible from around a ridge line.
I made a snap shot, to which my dad replied something to the effect of "damn that was fast". I told him that my fingers were numb and I was just getting onto her when the shot broke. Fortunately she dropped and it was a done deal, but I was quite uncomfortable with the situation and made a mental note to adjust the trigger.
As things would have it, I put the gun in the safe and did not adjust it. The next season rolled around, and I line up on another elk, and and taking up slack and boom. Again, I was right where I needed to be on target, but that was enough of that. I came home and pulled the barreled action out of the stock. That stock Tikka trigger was amazing, but too light, at around 2.5#s. So I adjusted it to 4#s and it has stayed there. Much more cold weather friendly.
As a practical matter, in sub zero hunts since most are in wide open terrain, I don't even chamber a round until we are into animals. I have taught my oldest daughter the same. Better to blow a shot opportunity, or meat in the freezer, than have an unintended discharge. Then again once we see animals, we have quick, pre stalk ritual of things that must be done, scope caps ready, jackets unzipped and wool watch caps off so you don't fog up scopes with sweat from your head, day packs adjusted, so you can simply plop down, range target and fire. Nothing else.
* I should not that most of the time on that hunt it is 15 above to 15 below, and the hunt with the combo of wind and very cold temps was just a cold year. There seems to be a pretty big difference to personal performance when it gets into the negative numbers. Everything takes longer and you have to be very deliberate, including pulling the trigger with numb fingers.
BTW, that 155 Scenar load is actually a good price when you think about what you get. That is a buck fifty a pop for Lapua bullets and brass. Lapua anything is not cheap and for loaded ammo, that is quite reasonable, plus then you have once fired Lapua brass for your rifle.