6MM Ballistics

dbhostler · #8 10-21-2003, 07:18 PM

Thanks again fellas. Your programs are truly amazing. Too bad they won't let us shoot a few tracer rounds at the range. You could appreciate the word trajectory a little more.
Could you recommend a program I could download in my computer that would make this information available?
db

a.JR · #9 10-21-2003, 11:09 PM

Db....Sorry mate i gave you a bumm steer as well ....I don't have a program but i shoot 1K regularly on my range....It's hot and humid and at sea level so my figures come from here only....My pal shoots a 6BR at 2920fps and the come up is 27.5 minutes,my lightgun is a 6mm x 55 imp and it shoots the same 107smk at 3375 fps ,the come up on it is 16 minutes exact..JR..Jeff rogers

dbhostler · #10 10-22-2003, 06:22 AM

No problem Jeff, it's always good to hear from you "down under", g'day. [img]images/icons/grin.gif[/img]
db

sscoyote · #11 10-24-2003, 01:28 AM

Say Mr. Jeff, you say you're getting 3300+ f.p.s. out of that big Sierra from that 6.5X55 necked down and blown out?? Man that sounds better than the .284 case. Does the 6.5X55 have a larger capacity than the .284??

[ 10-24-2003: Message edited by: sscoyote ]

a.JR · #12 10-24-2003, 02:49 AM

SS,yes the cartridge is actually a 6BR +600 thou.....The 6BR is 1.560 and the Swede is 2.160 ,using A Competition 6BR reamer and plungeing it in a further 600 thou it becomes the right dia for the Lapua 6.5X55 brass at .479 ......My load is quite high in the pressure so tread carefully...I load 47.5 gns of Hh4350 for 3375 fps ,next most successfull is 52gns of VV560 at same speed......Capacity is 60 gns of water when full and is smaller than the 6X284..JR..Jeff Rogers