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Old 12-07-2017, 08:54 AM
Bills Shed Bills Shed is offline
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Join Date: Jun 2015
Posts: 42
Default Open tips

I do not have a lead tipping die and all projectiles I have built are open tipped. All have a small air gap between the lead core and the tip.
A 17gn HMR sized projectile needs a tiny .405" jacket and you will still have about .075" air gap. I have made a 17gn as long as .525" long but this crumpled at the lead line when point forming but this was overcome by just putting a small piece of cork(wine bottle) into the jacket and then point formed. These were like darts and the cork supported the inside of the jacket without drama. These shot a .188" group with four rounds. The fifth blew it out to .684" This shows that you do not need a expensive jacket to hunt small critters.
I later found that a case, unannealed, does not need this support and point formed ...OK. Unannealed jackets do not tend to be as accurate and point forming can be a bit hit and miss at times as well as getting undersized diameters by .0004".

Bill
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