I've owned a number of 243's over the years and strangely enough they all shot well !
Had a couple of the Pre Garcia Foresters that had sporter weight barrels that shot nicely . Later I had a Sako Hunter I bought new that shot really well (that was about 1992) . Had a pair of Winchester Pre 64 Model 70's one a Varmint and the other a Featherweight , the Varmint was easily 1/2 MOA while the FWT was about 1" for 3 shots at 100 yards . Had I think 5 Remington 700's of which 3 were plain Jane BDL's and the other two were BDL Varmint rifles , all were made before 1980 and all shot really well . Also had a couple Ruger 77's in 243 that did nicely and at the present I have a Ruger #1B that'll keep three in about 3/4" at 100 yards plenty good enough for deer atleast .
In the HB guns I was always partial to the Nosler 70 grain BT , in the more deer suitable ones I was always partial to the Nosler 95 BT and the Hornady 95 SST .