A comment on the recent thread on the 7x57 re having odds and sods of ammo lying around prompts the question why don't more dealers and ammo makers follow the example of RWS and provide a test box - https://rws-munition.de/en/rws-hunti....html#!0/0/723 -
ie a box containing four or five cartridges of a number of different loads for a particular calibre. Indeed a dealer could go as far as splitting four or five different boxes and providing four or five different cartridges for you to go and try. You can soon tell which brand your rifle likes - it doesn't take a whole 20 round box full.
So you pick up your shiny new or even 2nd hand 243, £35 for a box containing 5 Norma, 5 RWS, 5 Federal and 5 Hornady 100gn loads. Go off and test them and come back to your favourite helpful dealer and buy the ammo you like.
Instead at the moment you buy a box of the cheapest ammo and give that a try, buy a box of what somebody else on the web suggests - now £70 down and then in disgust go another couple of brands and in the meantime curse the the dealer for selling you a useless rifle.
Even better would be to have dealers, with a range where they can help you set up and test fire your rifles.
And I have just seen a pig flying backwards doing barrel rolls