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From Hawk bullets website...........

Caution

Reduce beginning loads by 10%. Hawk bullets are different. Our soft jackets do seal the bore more completely and require less powder to produce normal pressures. Each rifle is an individual case, so always approach maximum loads with care.

Slug your bore. When loading for old American-made or any English or European rifle, particularly 9.3mm, .360, .350, or 43 Spanish calibers, it is very important that you carefully measure the bore with a lead slug and match the bullet diameter to the actual bore size. Numerous rifles chambered and marked for 9.3mm or .360 cartridges actually have .35 caliber bores and should use .358 diameter bullets. Many 43 Spanish require .435 diameter bullets instead of .439. Bullets up to .003 undersize usually work fine. If you don’t have the necessary equipment, any capable gunsmith can help.
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