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.600 Overkill Cup nose Boreriders . Max velocity and Terminal performance design

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18 June 2008, 03:59
Robgunbuilder
.600 Overkill Cup nose Boreriders . Max velocity and Terminal performance design
I just wrote some code for a .600 overkill borerider. Weight should be about 900 grs in brass. Only has a .620 bearing surface of .5 inches so pressures should be markedly reduced. The rest of the bullet (1.4 inches) just rides on the lands of the barrel. With these I think I'll be able to significantly exceed the 2400fps limit at 65KPSI with 900 gr bullets. I designed them with a cup nose too as that will be interesting on game. I plan to make a bunch next week in both brass and partially annealed copper. May need a crimping groove to feed thru the mag though. Should be interesting.-Rob


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18 June 2008, 05:55
boom stick
You mean 20 Gauge solids right Wink

I like bore riders...

I would think bore riders would be more inherently accurate not that it needs it.

pics when u got em'

Is a long range high BC 600 bullet in the works? Big Grin
Just in case you need to shoot an impala @ 300 yards BOOM


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18 June 2008, 06:48
Macifej
Lets see 'em....

Cool
18 June 2008, 21:22
CCMDoc
quote:
Originally posted by Robgunbuilder:
I just wrote some code for a .600 overkill borerider. Weight should be about 900 grs in brass. Only has a .620 bearing surface of .5 inches so pressures should be markedly reduced. The rest of the bullet (1.4 inches) just rides on the lands of the barrel. With these I think I'll be able to significantly exceed the 2400fps limit at 65KPSI with 900 gr bullets. I designed them with a cup nose too as that will be interesting on game. I plan to make a bunch next week in both brass and partially annealed copper. May need a crimping groove to feed thru the mag though. Should be interesting.-Rob


beer thumb


NRA Lifer; DSC Lifer; SCI member; DRSS; AR member since November 9 2003

Don't Save the best for last, the smile for later or the "Thanks" for tomorow
04 July 2008, 01:42
CCMDoc
quote:
Originally posted by Robgunbuilder:
I just wrote some code for a .600 overkill borerider. Weight should be about 900 grs in brass. Only has a .620 bearing surface of .5 inches so pressures should be markedly reduced. The rest of the bullet (1.4 inches) just rides on the lands of the barrel. With these I think I'll be able to significantly exceed the 2400fps limit at 65KPSI with 900 gr bullets. I designed them with a cup nose too as that will be interesting on game. I plan to make a bunch next week in both brass and partially annealed copper. May need a crimping groove to feed thru the mag though. Should be interesting.-Rob


How did your baby's new shoes work out? .620 (20 gauge for you, Boom Stick) inquiring minds want to know!


NRA Lifer; DSC Lifer; SCI member; DRSS; AR member since November 9 2003

Don't Save the best for last, the smile for later or the "Thanks" for tomorow
04 July 2008, 19:05
600 Overkill
quote:
Originally posted by Macifej:
Lets see 'em....

Cool


You're killing us Rob jumping WE GOTTA SEE EM beer beer The 750gr cavitators or these, or both??? Roll Eyes
05 July 2008, 19:20
SAFARIKID
Waiting "impatiently"! Smiler


"That's not a knife..THIS is a KNIFE" !