The big problem with the .243 for long-range competition is the short barrel life it cuts out barrels worst than the 6.5x284 it's ok for Whidden a new barrel every 800 rounds is not a biggie probably buys them by the dozen,
in a single shot Match rifle a 6mm Rem / 6mm Rem AI is the better option better velocity much longer barrel life,
If you don't mid a bit of weight a 6mm Rem built on a Mauser 98 action is better than a .243 any day of the week or if a fan of the Tikka T3 the 6mm Rem feeds better than the .243 and handles 100 grain
projectiles better and faster,
If you only want to shoot bullets up to 90 grains the 6mm will fit in a Sako 75/85 .243/7mm08/.308 action,
You may guess I am a 6mm Rem fan I have owned 3 still have 1, also have owned 4 .243's they never shot as good as the 6mm Rem kept trying to find a .243 that would out shoot my 6mm have given up and necked the cases up to 7mm08
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