Stinky Coyote
10-12-2008, 12:34 PM
Okay, short story, i took my laminate stainless tikka .270 and put it on a diet. Went to synthetic stock, talley rings and leupy ultralight 3-9x33 with target knob installed (gun is now right at or a hair under 7 lbs all in). Cleaned it, zeroed it at 220 yrds, and then reset the target knob to zero for that yardage. Then i went out and shot at 360 yrds and 498 yrds to determine the come ups on the target knob and that is what your going to see below.
I typed a bunch of data on a word document from my scribbles in the field so bear with me, i wanted to collect as much as possible as i have questions and would like comments/review etc. So here is my notes: (sorry i'm long winded)
Note: All shooting done laying prone in a big field over a caldwell tackdriver sideways for extra height. (trying to simulate shooting over a backpack for sheep hunting etc.)
"Tikka .270 Oct 11, 2008 shoot to 498 Yrds Data:
1st session to zero at 220 yrds with new leupy scope with target knob done a couple weeks previous on a clean bore, 16 shots fired for that session, and target knob reset to have zero for this distance.
This session ran 29 shots, the last 6 were just for chronographing, so 23 used to find come ups for 360 yrds and 498 yrds and confirm them.
Conditions for this session from Kestrel 2500 meter:
Temp: minus 6 degrees
Barometer: 26.07 inhg
Altitude: 3750’ feet
Wind Direction: Crosswind coming from behind at 45 degree angle going from right to left.
360 Yrd shooting:
Wind speed between 1 and 2 mph.
1st shot took 1.75 moa to get on the steel and it was low.
2nd shot at 2.25 moa and almost on the bull, a bit low left.
3rd shot at 2.5 moa basically same poi as previous shot.
4th shot at 2.75 moa basically same poi as previous shot
All 4 shots low of bull 3 of them within 2” or less, warm barrel now, 6 shots, for a final of 2.75 moa as the come up needed for 360 yrds.
Cooled barrel.
Repainted gong leaving one bullet hole unpainted as the aimpoint for next shots as that bullet hole was almost exactly center of the gong.
At 2.75 moa took two shots from 360 yrds on cool barrel to confirm, impacts both high, 1st shot less than 2” high and a bit right of the bull, second shot felt better and it was approx. 1.25” high and basically centered right above the aimpoint.
498 yrd shooting:
Wind speed around 2 mph.
1st shot 6.25 moa low left on the steel
2nd shot at 6.5 moa was 2” higher
3rd shot at 6.75 moa was 2” right of 1st shot but i had changed shooting postion from the 1st two shots?
This group was 2 .75” ctc, and the center of this group was 3.5” left of the center of the bullseye.
Group number two, cooled barrel.
Wind now gusting to 5 mph mostly.
1st shot at 6.75 moa, high left.
2nd shot at 6.5 moa, about 2” below 1st shot. (and just high of aimpoint height)
3rd shot at 6.5 moa i pulled low on the shot and called it, it was about 3” below the 2nd shot.
This group was 5 1/8” ctc with a pulled shot and the center of this group was 7” left of the center of the bullseye. So i’ve settled on 6.5 moa for 500 yrds.
Confirmed 220 yrd zero.
Chronograph numbers.
Ammo is factory federal fusion 130 grain for a standard .270 and a bone stock Tikka with 22” barrel. Rated velocity on the box is 3050 fps (but probably for a 24” barrel?)
6 shots.
1. 3012 fps
2. 3007 fps
3. 3004 fps (low)
4. 3015 fps
5. 3053 fps (high)
6. 3013 fps.
Average velocity of 6 shots is 3017 fps.
Take out the high shot number 5 and the average of the remaining 5 is 3010 fps."
Here come the pics. Remember, the exact data for each of the pics is detailed above.
This is first set of shots at 360 yrds, comments above.
http://pic20.picturetrail.com/VOL1600/824048/17448107/338277560.jpg
This is second set of shots at 360 yrds, remember the center most bullet on the gong was left behind as the aimpoint, only the two upper shots were shot to confirm come up.
http://pic20.picturetrail.com/VOL1600/824048/17448107/338277588.jpg
This is 1st set of shots at 498 yrds.
http://pic20.picturetrail.com/VOL1600/824048/17448107/338277633.jpg
This is second set of shots at 498 yrds, wind up to 5 mph by this point and the low shot i pulled and called it before i looked in the scope to see it.
http://pic20.picturetrail.com/VOL1600/824048/17448107/338277672.jpg
Okay, so the goal is to get a kenton ind. speed turret made up to match my set up. Do i have enough data to make that happen? Does anyone have the ability to use ballistic software to find out what the bc of my bullets are and use my data to find out what the rest of my come ups are for a bunch of other ranges? And does the drift to the left correspond correctly to the wind data i gave for that set up? (quietly wondering if i need to adjust my windage at all?)
Can someone give me some wind drift data also so i can attach something to my stock for that?
Next i'd like to hear any comments about my shooting. If you think my windage needs adjusting? Etc. etc. Lets talk.
So far i'm impressed what a bone stock tikka .270 and cheap fusion ammo can do in field conditions and a 7 lb all in package. I can't wait to get into reloading and try some 140 gr bergers and do it all over again but for now the factory stuff has to do the trick.
I typed a bunch of data on a word document from my scribbles in the field so bear with me, i wanted to collect as much as possible as i have questions and would like comments/review etc. So here is my notes: (sorry i'm long winded)
Note: All shooting done laying prone in a big field over a caldwell tackdriver sideways for extra height. (trying to simulate shooting over a backpack for sheep hunting etc.)
"Tikka .270 Oct 11, 2008 shoot to 498 Yrds Data:
1st session to zero at 220 yrds with new leupy scope with target knob done a couple weeks previous on a clean bore, 16 shots fired for that session, and target knob reset to have zero for this distance.
This session ran 29 shots, the last 6 were just for chronographing, so 23 used to find come ups for 360 yrds and 498 yrds and confirm them.
Conditions for this session from Kestrel 2500 meter:
Temp: minus 6 degrees
Barometer: 26.07 inhg
Altitude: 3750’ feet
Wind Direction: Crosswind coming from behind at 45 degree angle going from right to left.
360 Yrd shooting:
Wind speed between 1 and 2 mph.
1st shot took 1.75 moa to get on the steel and it was low.
2nd shot at 2.25 moa and almost on the bull, a bit low left.
3rd shot at 2.5 moa basically same poi as previous shot.
4th shot at 2.75 moa basically same poi as previous shot
All 4 shots low of bull 3 of them within 2” or less, warm barrel now, 6 shots, for a final of 2.75 moa as the come up needed for 360 yrds.
Cooled barrel.
Repainted gong leaving one bullet hole unpainted as the aimpoint for next shots as that bullet hole was almost exactly center of the gong.
At 2.75 moa took two shots from 360 yrds on cool barrel to confirm, impacts both high, 1st shot less than 2” high and a bit right of the bull, second shot felt better and it was approx. 1.25” high and basically centered right above the aimpoint.
498 yrd shooting:
Wind speed around 2 mph.
1st shot 6.25 moa low left on the steel
2nd shot at 6.5 moa was 2” higher
3rd shot at 6.75 moa was 2” right of 1st shot but i had changed shooting postion from the 1st two shots?
This group was 2 .75” ctc, and the center of this group was 3.5” left of the center of the bullseye.
Group number two, cooled barrel.
Wind now gusting to 5 mph mostly.
1st shot at 6.75 moa, high left.
2nd shot at 6.5 moa, about 2” below 1st shot. (and just high of aimpoint height)
3rd shot at 6.5 moa i pulled low on the shot and called it, it was about 3” below the 2nd shot.
This group was 5 1/8” ctc with a pulled shot and the center of this group was 7” left of the center of the bullseye. So i’ve settled on 6.5 moa for 500 yrds.
Confirmed 220 yrd zero.
Chronograph numbers.
Ammo is factory federal fusion 130 grain for a standard .270 and a bone stock Tikka with 22” barrel. Rated velocity on the box is 3050 fps (but probably for a 24” barrel?)
6 shots.
1. 3012 fps
2. 3007 fps
3. 3004 fps (low)
4. 3015 fps
5. 3053 fps (high)
6. 3013 fps.
Average velocity of 6 shots is 3017 fps.
Take out the high shot number 5 and the average of the remaining 5 is 3010 fps."
Here come the pics. Remember, the exact data for each of the pics is detailed above.
This is first set of shots at 360 yrds, comments above.
http://pic20.picturetrail.com/VOL1600/824048/17448107/338277560.jpg
This is second set of shots at 360 yrds, remember the center most bullet on the gong was left behind as the aimpoint, only the two upper shots were shot to confirm come up.
http://pic20.picturetrail.com/VOL1600/824048/17448107/338277588.jpg
This is 1st set of shots at 498 yrds.
http://pic20.picturetrail.com/VOL1600/824048/17448107/338277633.jpg
This is second set of shots at 498 yrds, wind up to 5 mph by this point and the low shot i pulled and called it before i looked in the scope to see it.
http://pic20.picturetrail.com/VOL1600/824048/17448107/338277672.jpg
Okay, so the goal is to get a kenton ind. speed turret made up to match my set up. Do i have enough data to make that happen? Does anyone have the ability to use ballistic software to find out what the bc of my bullets are and use my data to find out what the rest of my come ups are for a bunch of other ranges? And does the drift to the left correspond correctly to the wind data i gave for that set up? (quietly wondering if i need to adjust my windage at all?)
Can someone give me some wind drift data also so i can attach something to my stock for that?
Next i'd like to hear any comments about my shooting. If you think my windage needs adjusting? Etc. etc. Lets talk.
So far i'm impressed what a bone stock tikka .270 and cheap fusion ammo can do in field conditions and a 7 lb all in package. I can't wait to get into reloading and try some 140 gr bergers and do it all over again but for now the factory stuff has to do the trick.