Range report 3-26-12

[Alaskapopo]

Remington 700 groups
http://i59.photobucket.com/albums/g299/355sigfan/Remington%20700%20Targets/RemingtonSierratesting.jpg
http://i59.photobucket.com/albums/g299/355sigfan/Remington%20700%20Targets/greatgroup.jpg

When I first got this gun it averaged .56 with this load. Lately it been declining. I think I need new brass. I fired my best group ever with some once fired Federal Gold Medal Match Brass my friend gave me. My other brass is also Federal but from American eagle ammo and I have reloaded it and trimmed it a few times now.
http://i59.photobucket.com/albums/g299/355sigfan/manually%20operated%20rifles/Remington700build.jpg

Love this gun. I do need to get a 20 moa base. I did the math and found out I don't have enough elevation adjustment to get to 600 yards even when using the reticle too. I have 18 mils left and I need 31 or so. 18 plus 9 in the reticle gets me to 27. I can do it with Factory 155 grain TAP however. Eventually I am going to get a Nightforce for this gun.

[jpipes]

Remington 700 groups
http://i59.photobucket.com/albums/g299/355sigfan/Remington%20700%20Targets/RemingtonSierratesting.jpg
http://i59.photobucket.com/albums/g299/355sigfan/Remington%20700%20Targets/greatgroup.jpg

When I first got this gun it averaged .56 with this load. Lately it been declining. I think I need new brass. I fired my best group ever with some once fired Federal Gold Medal Match Brass my friend gave me. My other brass is also Federal but from American eagle ammo and I have reloaded it and trimmed it a few times now.
http://i59.photobucket.com/albums/g299/355sigfan/manually%20operated%20rifles/Remington700build.jpg

Love this gun. I do need to get a 20 moa base. I did the math and found out I don't have enough elevation adjustment to get to 600 yards even when using the reticle too. I have 18 mils left and I need 31 or so. 18 plus 9 in the reticle gets me to 27. I can do it with Factory 155 grain TAP however. Eventually I am going to get a Nightforce for this gun.


Something is very, very off if you are needing 31 mils to get to 600. At 600, assuming a 100 yard zero and 168's at approximately 2500fps, you should only need 4.9-ish mils, depending on weather. You have plenty of elevation left with 18 mils....

[ICANHITHIMMAN]

Something is very, very off if you are needing 31 mils to get to 600. At 600, assuming a 100 yard zero and 168's at approximately 2500fps, you should only need 4.9-ish mils, depending on weather. You have plenty of elevation left with 18 mils....

Agreed

I am supprised you speeds are so low with the VN powder what was the air temp? Also you es and sd are very high. you want to get them to single digits or in the teens.

[Alaskapopo]

Agreed

I am supprised you speeds are so low with the VN powder what was the air temp? Also you es and sd are very high. you want to get them to single digits or in the teens.

Its 37 degrees out and its a 20 inch barrel. My speeds are only 100 fps slower than factory Federal match in the same gun.

But I did make a huge mistake in my calculations. Forgot to multiply the mils for the given range. 100 yards a mil is 3.6 inches at 300 yards a mil should be 10.8 inches. So for 18 inches of drop at 300 yards I should need only 1.6 mils not 5 like I had figured. Glad I found this snafu out before the match this sunday. I am embarressed. Thanks guys.
Pat

[jpipes]

Prior to the match, do yourself a quick favor and print a dope sheet from jbm, or download Shooter on your smartphone. It will help tremendously, especially if it's a "tactical" match.

[juliomorris]

You should need anymore than 15mils for a 1000. I use JM ballistic calc and it is very accurate for most bullets.

http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi

[orkan]

100 yards a mil is 3.6 inches at 300 yards a mil should be 10.8 inches. So for 18 inches of drop at 300 yards I should need only 1.6 mils not 5 like I had figured. Why bother with linear measurements at all? You shoot angular... this is a fact. Measure angular, think angular, compute angular.

The only linear measurement you should concern yourself with is the distance to target.

Obviously when measuring group sizes you can use it too. Otherwise, at no point in your firing solution should angular drop be considered unless you are trying to shoot through a loophole. (and even then its debatable if you'd need to)