Cool! Given the temperature in which you were firing, maybe I should say, "Way cool! I will restrain my Monday Morning impulse to offer coffee cup advice on zeroing/firing your rifle. From what I've read, working with the Lee-Enfield series of rifles is different compared to working with a Mauser type rifle. I will look forward to further reports of your experiences with your Mk. 4. No. 1. I wish you every success. Sincerely. BruceV.