Back in the Garbanzo beans again
 

I did have a busy day today but it was a good day because of a scheduling opportunity on my part. But I was able to get to the farm this afternoon for another shooting session. It would be a brief session but beneficial in my mind. Plus Grouse had shoot the Lehigh 40x215 bullet across two chrono's collecting velocity information which I then plug into a Barnes Ballistic Calculating program.

The shoot, one of the better days for summer shooting it was raining lightly and the temps were in the low 70's - it was really nice. Got to the farm and set the shooting station up. Target at 100 and bench just out side of one of the equipment sheds - which served as the loading station.

I was trying something different today - SSHooter and I have, and Grouse have been sharing notes. SShooter fired the 215 gr. Lehigh in a 1/30 twist the other day using gaining volumes of BH. He really got decent accuracy and may have shed a little of the yawing in the bullet when shot from a 1-30. With that bit if encouragement I to took a 1/30 Knight and the Super DISC to the farm. My goal was to shoot my normal hunting load in both rifles, 120 grains of T7 but the switch up was I was going to use T7-3f to generate a little more velocity with the bullet hoping possibly to take of the yaw.

I did make a mistake shooting this afternoon, as usual I was in a rush, Instead shooting a fouling shot as I normally do and then shooting on a 'semi fouled' as I do hunting - I shot that first shot from the 1/30 into the target. I went ahead then and shot the two rounds and ended up with a 2 1/4' group. Shots 2 and 3 measured 3/4" center-to-center. I then switched rifles and powder, went back to T7-2f - 120 gr. my normal load in a 209 rifle and shot the last group of three. And way you measure it - it measure right at 1" center to center. Both rifles appear to shoot the bullet equally well. But we have learned that not all 1-30 do well with the bullet. Mine and SShooters work very well when it comes to accuracy 100 yards to 200 yards. But Grouse's does not do well at all, but that might be due to an eroded vent liner.

Here is the target from today.



After this I went home quickly - I needed to beat Terry home to get some work done.

The next piece of information - really kind of blew my mind... I depend on Grouse to get me the velocity information on the different bullets. Today he gave me this information. The average muzzle velocity of 3 shots was 2090 fps with 120 gr. of BH at about 700' of elevation. The average velocity of the bullet at 100 yards was 1870 fps. With this information I feed it into the Barnes Ballistic Calculator, which has always proven to be a very reliable program not perfect but pretty darn good.

This is the sheet the program produced. When sighting in a I use a PBR (Point Blank Range Calculation) and in most cases I request a 6" PBR. This gives me a bullet path that will not be greater than 3" high on the target or 3" low by holding directly on the target. In this case the zero range will be approximately 174 yards and maximum range and being 3" low would be at 216 yards.

BC of .295 is really good . That would be a 300 ydbullet easily and could be stretched to 400 if the accuracy is there at that range .i plan on harvesting a few deer or antelope with it so i guess i will see how it performs soon enough

That BC is amazing. It's actually better then the 230grn Lehigh that never really materialized because of different opinions and results. I think the small nose like sabotloader says is the key. I need to shoot that bullet threw some crap to see if anything can restrict it from working like it's supposed to. Cause it does have a small nose on it.

Mike,
I wish you would of shot a fourth shot on group 1. Can't ask for much better on group 2.

The Bc is really up there. The Parker 275 gr BE is listed at .296 and that was obtained using smokeless powder at higher velocity. Toby rated the bc of the parker at .250 so to get .295 at those velocities from the Lehigh is amazing.

I can assure you the velocities are correct. I actually tested those pretty slow. Could you imagine what 130grns by volume would do?

I think I would like to find out.:s2:

I was going to but I really needed to beat somebody home - so time was crunched. And normally both of these rifle shoot the CCB shot very close to the semi cleaned group.

Another thing is when shooting both of these rifles with the new CF they both shoot approximately 4" high. There is only 5" of target above the center of the bull. Both rifles are/were sighted in to be 3" high at a 100 with the Lehigh/Bloodline 40x200 DOA. So to get the bullet on target I have to make up a hold on the target other than dead center on the bull. getting that hold the same each time is also an event.

Now that I know the bullet has a value - I will actually sight the rifles in, adjust the scopes, with that particular bullet. I just hate moving scopes in the summer.

Sabot, just put a round stickum 3 inches low on your target with an + on it and make that your aim point. Just make sure you get the + level with the Bulls + so that you wont be canting the rifle.

Yep should have done that instead trying to invent a hold... actually if I were not so dang stubborn I should have just turned the scope down 8 clicks...:devil:

And I really do depend on the horizontal line to help keep from canting the rifle.

You have to be stubborn to like shooting a smoke pole. Haven't met a smoke poler yet that wouldn't give a Mule a run for it's money :s1: