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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
HUGE BC change with opening up the hollow point.
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<blockquote data-quote="davewilson" data-source="post: 170266" data-attributes="member: 4491"><p>i've been experimenting with opening up the hollow points to help insure expansion. and my technique is simply holding on to the bullet in one hand and the drill bit in the other. now i know everyone is saying you can't get the "new" hole exactly in the middle, concentricity issues,and all i can say to that is BFD. my reasoning is simply look at the tip of an unaltered SMK bullet. most of them do not have a nice looking tip on them. one side of the metal of the hollow point is as much as .020 higher than the other side. talk about out of balance.i start by using a .043 drill and then run a .047. it doesn't cut very deep maybe .06 or so, then it's hollow until about 3/8 down and you hit the lead.unfortunately, this makes nasty burrs at the tip of the hollow point and i use mother's nail file to clean em up.when i'm done, my tips are much more uniform than from the factory and a 047 hollow point to boot. i've shot these at 500,600,800, and 1k so far and i can't determine any difference in accuracy.interestingly i can't see any difference in POI either.the last 3 outings i loaded three unaltered bullets for just this purpose and they hit at basically the same height. to be honest i don't really care if it would affect the BC as long as it makes them expand every time, i think that's more important.</p></blockquote><p></p>
[QUOTE="davewilson, post: 170266, member: 4491"] i've been experimenting with opening up the hollow points to help insure expansion. and my technique is simply holding on to the bullet in one hand and the drill bit in the other. now i know everyone is saying you can't get the "new" hole exactly in the middle, concentricity issues,and all i can say to that is BFD. my reasoning is simply look at the tip of an unaltered SMK bullet. most of them do not have a nice looking tip on them. one side of the metal of the hollow point is as much as .020 higher than the other side. talk about out of balance.i start by using a .043 drill and then run a .047. it doesn't cut very deep maybe .06 or so, then it's hollow until about 3/8 down and you hit the lead.unfortunately, this makes nasty burrs at the tip of the hollow point and i use mother's nail file to clean em up.when i'm done, my tips are much more uniform than from the factory and a 047 hollow point to boot. i've shot these at 500,600,800, and 1k so far and i can't determine any difference in accuracy.interestingly i can't see any difference in POI either.the last 3 outings i loaded three unaltered bullets for just this purpose and they hit at basically the same height. to be honest i don't really care if it would affect the BC as long as it makes them expand every time, i think that's more important. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
HUGE BC change with opening up the hollow point.
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