In reply to:

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Perhaps modern powders or maybe that cartridges heated by the tropical sun produced a little more velocity, which in turn affected bbl. time. It might be interesting to warm up your ammo before firing and see how it behaves.

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Andre, this could be the case, but MORE velocity would make the rifle shoot lower, not higher! I believe the loads need speeding up, unless he has already reached the pressure limit! The sight change is probably the best fix, since both rifle are printing good groups with these loads!