Re: bullet ogive measuring for mile shooting
Sorry guys, I forgot to mention that this load in my gun shoots deviations in the single digits and that I am shooting one mile at 5000 foot elevation and I can attest that those 140 bergers ARE NOT going subsonic. They may be starting to enter the transonic state, but they are still making a loud "snap" as they go by.
I just returned from my third attempt at one mile and this time, the results were nothing short of amazing. I actually had my friend sit in a trench just shy of the gong as I shot with his radio locked on so I could hear the bullet go past him as I shot and they all went "snap" quite loud. I also shot through a model 35p chronograph while I was aiming at the gong, and every shot that was 15 fps slower than the average landed about 30" low at the mile! I even had one shot that went 40 fps faster for some reason and it landed about 4' higher! Amazing! As for the six-five being a mile shooter, I agree there are better, but it will do it ok. We hit my 15" gong twice in 30 shots, and we had 15 shots miss it by 6"-20" with one six shot group measuring 14x16x19.5". (we had a giant box set up behind the gong so we could see groups that missed). As for the ogive length, I had 10 bullets of each length, one row at .?20, one at .?22 and one at .?24. Each were shot in order and the last row took an extra minute and a half to do what the first row did. So as far as I can tell, a ogive length difference of .004" makes roughly 19"-21" difference at one mile!! For those in doubt, I have noticed this problem at 1500 yards where my bullet is still way supersonic, and it seems to be almost as bad there.
This is just too much fun. I can't wait for the .338 lapua improved to show up this winter so I can try 2000 yards. When or where will it end!
[ 12-05-2004: Message edited by: goodgrouper ]
If it's not far, it's boring.