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Need some help with some dope.
#5533063
01/10/15 10:09 PM
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Joined: Feb 2009
Posts: 5,872
GLC
OP
THF Trophy Hunter
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OP
THF Trophy Hunter
Joined: Feb 2009
Posts: 5,872 |
Ok, now since I got your attention. I need an approximation as to what I can start on to try to stretch out my rifle out for next weekend test. 7mm08, 24" barrel, 140 grain Nosler ballistic hunting tip, 42 grains IMR 4064, 1 in 11" inch twist Sorry no speed data. 100 yards to 500 yards? MOA or MIL Just best guess on bullet drop so I kinda know where to start.
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Re: Need some help with some dope.
[Re: GLC]
#5533102
01/10/15 10:36 PM
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Joined: Jul 2011
Posts: 713
headhunter54
Tracker
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Tracker
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Re: Need some help with some dope.
[Re: GLC]
#5533143
01/10/15 10:57 PM
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Joined: Apr 2010
Posts: 6,219
dee
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THF Trophy Hunter
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You really need to have some idea of velocity for best results. You can walk it in but record your drops then you can go back to jbm and adjust velocity to match.
"A vote is like a rifle; it's usefulness depends on the character of the user" Theodore Roosevelt
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Re: Need some help with some dope.
[Re: dee]
#5533250
01/10/15 11:44 PM
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Joined: Feb 2009
Posts: 5,872
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You really need to have some idea of velocity for best results. You can walk it in but record your drops then you can go back to jbm and adjust velocity to match. Yes I agree. Thought it may be a shot in the dark but don't have a Crono. Guessing somewhere in the ball park 2600 to 2700 fps? Well I will see what the drops are 100 to 300 and then try to go from there.
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Re: Need some help with some dope.
[Re: GLC]
#5533399
01/11/15 12:37 AM
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Joined: Sep 2006
Posts: 32,482
kmon11
junior
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junior
Joined: Sep 2006
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With that load and barrel length Quickloads shows 2854fps. Sometimes that program is almost dead on other loads it is a bit off, really depends on the gun too.
If it were me and without a chrono I would start with that velocity, and do what Dee recommended
lf the saying "Liar, Liar your pants on fire" were true Mainstream news might be fun to watch
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Re: Need some help with some dope.
[Re: GLC]
#5534201
01/11/15 12:41 PM
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Joined: Aug 2008
Posts: 7,806
Deerhunter61
THF Trophy Hunter
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THF Trophy Hunter
Joined: Aug 2008
Posts: 7,806 |
Invest in a Chrono...they are worth it.
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Re: Need some help with some dope.
[Re: GLC]
#5534220
01/11/15 01:21 PM
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Joined: Dec 2008
Posts: 41,158
J.G.
THF Celebrity
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THF Celebrity
Joined: Dec 2008
Posts: 41,158 |
Try this. Its not set in stone.
200 .4 Mil 300 1.0 Mil 400 1.8 Mil 500 2.7 Mil
If you want all that in MOA, mutiply those Mil values by 3.43
That was 260 Rem, 6.5 Creedmoor, and I bet yours is real close to it. Should get you on target, adjust from there as needed.
800 Yard Steel Range Precision Rifle Instruction Memberships and Classes Available
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Re: Need some help with some dope.
[Re: GLC]
#5534464
01/11/15 04:28 PM
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Joined: Sep 2006
Posts: 32,482
kmon11
junior
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junior
Joined: Sep 2006
Posts: 32,482 |
Dang close to what I come up with and the velocity I posted above. Expect that to be close enough to get you started. Adjust accordingly from measured drops from shooting. By that shoot at 100 and other yardages. That chart is from the Hornady Ballistic Calculator free on their web page. Have found it to be pretty accurate if given good data. http://www.hornady.com/ballistics-resource/ballistics-calculator
Last edited by kmon1; 01/11/15 04:36 PM. Reason: replaced pix
lf the saying "Liar, Liar your pants on fire" were true Mainstream news might be fun to watch
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Re: Need some help with some dope.
[Re: GLC]
#5534928
01/11/15 06:59 PM
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Joined: Feb 2009
Posts: 5,872
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Re: Need some help with some dope.
[Re: GLC]
#5536225
01/12/15 01:03 AM
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Joined: Sep 2009
Posts: 18,934
ChadTRG42
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Those drop figures will definitely get you on target. But to walk in backwards on your velocity, you will need much further than 300 yards. At 500, it will get me really close, but I prefer 600 or further to calculate my velocity with using field dope and running the environmental conditions.
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Re: Need some help with some dope.
[Re: GLC]
#5537557
01/12/15 05:13 PM
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Joined: Feb 2009
Posts: 5,872
GLC
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THF Trophy Hunter
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Thanks Chad, since I got into reloading I probably need to get a Crono but haven't done it yet. Just now getting a little fimillar with reloading and just looking at grouping. And really haven't tried to stretch my yardage until our last Hunting Challenge of 300 yards. Have learned a whole lot since Last Jan to now thanks to a lot of input on here including yourself but still have long ways to go.
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Re: Need some help with some dope.
[Re: GLC]
#5537567
01/12/15 05:19 PM
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Joined: Oct 2009
Posts: 563
rrflyer
Tracker
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Tracker
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It'll probably be 1/10 to 2/10s more drop than Fireman JG posted.
That's from shooting alongside a buddy with a 7-08 and me shooting 260. He always ran 1/10 or so behind
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