162 sst b.c.

[jsthntn247]

Hornady list the b.c. at .550. I printed off a g7 ballistics table which said that it should take me 10.1 moa to get to 600 yards with a chrono'd speed of 2900 fps. When I shot yesterday, it took me 11.3. I went back in the program and it said the bullet would have to have a b.c. of around .450 for this to be true. Anybody ever shot these and if so how true did you find the b.c. to published. This was out of a 7rem mag with 67.6gr of h-1000.

 

[elktaxi1]

what did you have for a zero. i just run it though my program from berger. it says with a 100yd O it is 12.18 at 600. it could also be the temp u run them at or the elevation.gun)

 

[Bravo 4]

I've run them to 1000 and used a .550 BC.

 

[jsthntn247]

It as hot, about 94 degrees with 60% humidity, but I added this to the program. Also I'm also shooting at an elevation of 200 feet. I have chronod the load several times and it's always running 2885-2900 at 15' from muzzle. Just kinda sucks because if I use a .450 B.C. I get the same results as shooting 2776 fps. Might as well be using a .308 and saving 20 grains of powder per shot.

 

[Bravo 4]

Have you ever checked the adjustments on your scope?

 

[backwoods83]

I'm not sure if Brian Litz has ever tested these or not but if anything id almost bet they are slightly under rated as they are not a whole lot different than a 162 amax.

 

[Bravo 4]

I think you are zeroed for 100 and have 200 inputed into the program.
That's what my iPhone said.

 

[jsthntn247]

Scope is a Vortex Viper that has spot on tracking. I would like to shoot it through another chrono and see what it said. According to hodgdon, at 67.6 grains, I should be running a little less than 2800. The speeds that my chrono has said has worked with all my other guns. Don't Know but I was 8 inches low at 600, moved up 1.5 moa and shot a 2.38" group in the bull.

 

[backwoods83]

What brand of brass and primer are you using, and what is your barrel length and coal? 67.6grns of H1000 is like a reduced recoil load if your close to the lands you should be around 71-72grns and over 3000 fps in a 26" barrel or around 2950 in a 24".

 

[jsthntn247]

Fed 215 primers, 24" tube, loaded on the lands. With this bullet/barrel combo, my speed topped out at 2950 at 68.5 grains. After 68.5 my speed was eratic and got allot of powder fouling. I assumed this was because I wasn't burning over 68.5 effectively with my barrel length. 67-68.5 gave me less than .2 of vertical on a 600 yard ladder test. I then shot an ocw test at 100 and found 67.6 to be in the middle of a node. I then shot different COL's with 67.6 and determined that they shot best kissing the lands. My chrono still reads 2885-2904 at 15' from the muzzle with a e.s. of 19 and sd of 9, so I am very happy with the load even if it is slow, just trying to figure out why.

 

[backwoods83]

I know you were asking about bc but with a 24" barrel try a faster powder, imo Imr4350 with fed210m's I bet you can match the velocity, gain accuracy, and get your ES in the single digits with a lot less powder, H4831sc works good as well, I use H1000 for some things but its not one of my favorites because it is dirty and carbon fouls faster.