the bullet selection for .505" is pretty limited but it looks like I could do 200 yards with some of the lighter bullets. according to the ballistics calculator the standard load for the 525gr Barnes TSX at 2300fps could work at 200 yards with a 165 yard zero. there is also the GS custom 455gr HV bullet which could probably be pushed at around 2500fps within standard operating pressures.
then again, the 416 with a 350gr bullet or a 375 with a 260gr bullet will do a much better job at 200+ yards with half the recoil. just because some big bores are capable of taking game at 200 yards does not mean they are good choices for it (no offence intended). Medium bores are far more suited for those "long shots" while still being plenty powerful enough for DG.
-matt
Hi Matt85,
I noticed awhile back that you might be intending to use 600 gr bullets in your .505 Gibbs.
For elephant, no doubt a 600 gr solid from that caliber would be the cat's pajamas.
However, for buffalo, my best well read guess is that the original load for your bazooka (50 caliber 525 gr bullet, at around 2300 fps), placed centrally through the "blood pump & air bags" region will knock any buffalo's dikdik in the dirt, faster than you can snap your suspenders and holler howdy.
I base this on having read all that I can find on Cape buffalo hunting plus, listening to all that various PHs and fellow clients have told me about their personal experiences with same.
Point being that, unless hunting elephant, you could perhaps stick with the original Gibbs load/ballistics.
Thereby you'd have the best of both a serious stopping rifle and a 200 yard antelope getter if you saw some special waterbok, eland, nyala, warthog, whatever that you could not live without, you'd be all set.
There would be no fumbling around trying to get a flatter shooting cartridge into your rifle or any of that, just get on the sticks, put your sight picture on the mark as you had practiced many times and touch'er off.
All of this in the face of the fact that 200 yd shots in most buffalo habitat are very rare.
In one of Doctari's excellent books, he wrote of knocking a very upset cow elephant off her feet with his .505 and a .525 gr bullet, by putting the bullet square on her shoulder as she ran past his location, back in the days before the 600 gr Woodleigh was available in .505 diameter.
Anyway, Cheerio for now,
Velo Dog.