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#5533063 - 01/10/15 04:09 PM Need some help with some dope.
GLC Offline


Registered: 02/25/09
Posts: 4117
Loc: Burleson Texas
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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#5533102 - 01/10/15 04:36 PM Re: Need some help with some dope. [Re: GLC]
headhunter54 Offline
Tracker

Registered: 07/07/11
Posts: 577
Loc: Longview, TX
Go to JBM Calculations

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#5533143 - 01/10/15 04:57 PM Re: Need some help with some dope. [Re: GLC]
dee Offline
Extreme Tracker

Registered: 04/10/10
Posts: 4665
Loc: Red River way
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.
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#5533250 - 01/10/15 05:44 PM Re: Need some help with some dope. [Re: dee]
GLC Offline


Registered: 02/25/09
Posts: 4117
Loc: Burleson Texas
Originally Posted By: dee
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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#5533399 - 01/10/15 06:37 PM Re: Need some help with some dope. [Re: GLC]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 20315
Loc: Texas
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
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#5534201 - 01/11/15 06:41 AM Re: Need some help with some dope. [Re: GLC]
Deerhunter61 Online   content
THF Trophy Hunter

Registered: 08/27/08
Posts: 5559
Loc: DFW
Invest in a Chrono...they are worth it.

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#5534220 - 01/11/15 07:21 AM Re: Need some help with some dope. [Re: GLC]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
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.
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#5534464 - 01/11/15 10:28 AM Re: Need some help with some dope. [Re: GLC]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 20315
Loc: Texas
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


Edited by kmon1 (01/11/15 10:36 AM)
Edit Reason: replaced pix
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#5534928 - 01/11/15 12:59 PM Re: Need some help with some dope. [Re: GLC]
GLC Offline


Registered: 02/25/09
Posts: 4117
Loc: Burleson Texas
Thanks a bunch
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#5536225 - 01/11/15 07:03 PM Re: Need some help with some dope. [Re: GLC]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9433
Loc: Lewisville, TX
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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#5537557 - 01/12/15 11:13 AM Re: Need some help with some dope. [Re: GLC]
GLC Offline


Registered: 02/25/09
Posts: 4117
Loc: Burleson Texas
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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#5537567 - 01/12/15 11:19 AM Re: Need some help with some dope. [Re: GLC]
rrflyer Offline
Bird Dog

Registered: 10/19/09
Posts: 485
Loc: Denton---ish
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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