try box of 150 and box of 180 sporting stuff...one of the two will make it hum.....most SMLEs prefer one over the other.....if you have as you believe got one with a good barrel...for the love of God look after it,treasure it and clean it regularly...... I have fond memories of hunting with the 303.....funny having just purchased new rifle the comments about them are mostly good but folks whinge about 2 stage trigger......and its heavy......obvious they never cut teeth on a SMLE.....
if you going to reload...get in touch with shootersnz/Robert he will sort you out with cast projectiles to feed the ol girl.... if you want low recoil (heck all 303 loads are low recoil) try some projectiles made for the 7.62x39mm 123grns loads of folks have had them work well...and if your barrel is new and unworn they should work even better.
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