its a .270w you do not need to over think it.....
chammy arent a tough animal.....450 yards isnt a huge distance and one would assume/hope he will be dialing up and twiddlin n fiddlin out past 350......
speer make some great soft projectiles cheaper and easier to find than the flash hornady ones....
NBTs just plain old work.......
hornady sp are just boringly reliable and accurate
your mate pokes a .277" sized hole in chest/front wheels of chammy and it wont be going anywhere.
see what components you can get...2213sc is my usual powder or the hodgdon equivilent 760 from winchester is very nice to load too. others like 2208.... what you can get is more important.
pick load down the scale and work up..my rifles happy near top...RUMPYs one like it nearer bottom of scale.... DO NOT ASSUME,start low and work up... you only need a couple of each load to check it for pressures...the OLD WAY of doing it.... look at primer,look for swipe marks,feel for bolt resistance.
for years my loads were rather on mild side,only a little above minimum and I still killed animals.
accuracy and reliable repeatability are hand in hand and much more important that top velocity.... fast is good to be sure,but being able to hit right spot more so.
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