ORIGINAL: philnie
Pglasgow
I've been using the same ballistics calculator - do you have any data that proves/disproves the BC calculations it provides? For instance, punching in the Buffalo Bullets 375gr SSB info one gets a BC of .514! While the 460 NE has a BC of .259 which I believe UC said .25 was a good estimated BC to use for these large round nose conicals ...
I'm still working on being able to shoot consistent groups so haven't gotten to your level yet (per this thread), but it's clear from all of the various projectiles we could shoot - and what's available in an all lead one at that - they have a pretty big BC spread amongst them. Sheer drop out to 150yds regardless of sight in distance is limiting in my opinion. I'm not sure I'll be able to shoot out to 150yds with dead center holds on deer sized game - time will tell though.
The BC of the 375 Buffalo SSB is good, but not that good. I don't remember what it is, but I'm pretty sure its above .30 according to actual 100 yard chrono to chrono tests which Buffalo has done. Seems like Randy Wakeman published an interview at Chuckhawks.com with Buffalo's founder and the BC is mentioned there.
Keep in mind Philnie, that you don't have to use the BC calculator in order to use the trajectory calculator. Just put the appropriate BC number in the field of the trajectory calculator and recalculate.
I think if I actually get serious about taking 150 yard shots at game, I will make certain that my muzzle velocities exceed 1550 ft/s and that my zero is around140-145 yards. That way, I can shoot lower in the vitals at short range where I am confident about the groups. At 150 I would aim "point-blank". With this arrangment my "elevation adjustments"are taken at ranges that are easier to determinewhile still keeping the sights on the vitals.
Happy Hunting, Phil