This will answer yours and others questions . In the mid 80s ross collings built a heavy 220 on a 98 action with huge muzzle brake while working with din ,his dad . The gun went to pomgolia for trials by the brit sas for sniper use against hijackers on planes . Many shots were fired at pigs heads behind plane side windows at ranges up to 400 mts and it was very successful . I personally handled the rifle at dins when it returned for minor tuning The nzdf were going to get some made [ not sure if they went ahead] but in the mean while the ordered somthing like 30000 rounds from cr pain [ norma agents ] but some mityped like me and a couple of zeroes got added to the order . Hence the cheap surplus 220 that has been for sale since . At 1 stage it was $10 a packet . So maybe try ross at outdoor supplies in carterton for help .
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