Hi Hunty1, answer to your recent question, I load my 7x57 to 76 or 77mm coal [from memory] Theres still a decent jump to the lands, but I dont think the mag will allow any more. Sorry havent got the rifle with me to check.
For your trial loads I would suggest maybe trying 5 shots to give you a more representative grouping. And are you sure its your first shot thats high? Years ago Graham Henry told me that if he had a rifle that did this, particularly if it was a load he liked, he sighted for that first cold bore shot and didnt worry about the rest. You only need one shot!
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