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Anyone own a 7mm 300 Win Mag?

 
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  #442  
Old 09-17-2013, 09:56 PM
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Re: Anyone own a 7mm 300 Win Mag?

my stock finally made it here today so my 7x300 is finished at last!!

details here....

my new 7mmx300win
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  #443  
Old 09-25-2013, 02:02 PM
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Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by Broz View Post
Get an Oehler or a Magneto Speed.

73 gr of H-1000 and a 180 should be well over 2861 from a 27" tube.

In all honesty, I will say your are shooting on different days under different light and the Chrony is fooling with you.

Have you tested drops out to 1000 to see what velocity is needed to match?

Jeff
got my magnetospeed today,,, my 180 load with rel 25 3008 ave, 168 long range accubomb load is 3038 10 shot ave,,,when i shot my drops for the 168 i was thinking i was at 3130 or so using berger website and the nosler g7, i will run my h1000 loads and retumbo thru the magneto in a day or two,, the magneto wants to keeping jumping off barrel every 3 or 4 shots have to keep pulling it back to the same spot on barrel i marked
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  #444  
Old 09-25-2013, 03:21 PM
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Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by 300stw View Post
got my magnetospeed today,,, my 180 load with rel 25 3008 ave, 168 long range accubomb load is 3038 10 shot ave,,,when i shot my drops for the 168 i was thinking i was at 3130 or so using berger website and the nosler g7, i will run my h1000 loads and retumbo thru the magneto in a day or two,, the magneto wants to keeping jumping off barrel every 3 or 4 shots have to keep pulling it back to the same spot on barrel i marked
Make sure the strap on your MS is a double loop, not a single. Also if it keeps coming loose we placed one of the extra rubber spacers on top the barrel under the strap to give it more memory. This kept it tight.

Jeff
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  #445  
Old 09-25-2013, 08:04 PM
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Re: Anyone own a 7mm 300 Win Mag?

ran out and tried a handful of loads 73 gr h1000 went 3019, 74 gr retumbo 3013 both leave ejector marks, running 2o thousands short of the lands, a new bullet drops in a fired case with a slight drag,,,so i have a longer barrel, wildcat, new dies and brass, didnt gain but about 100 fps over the last custom 7mags i had built with kreiger and bartlein barrels,,,

was really hoping to be in the 3100 range with the 180 berger

my 7saum with 27 in kreiger barrel is shooting the 180 berger at 2870,,, 63 gr of 4831sc,,

i think i will send it off and have travis do a 7 rorue with a new barrel after hunting season,,,

on a positive note the magnetospeed is tremendous, best piece of shooting gear i have bought, been thru to many chronys and prochronos,,,, but no more,,,
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  #446  
Old 09-25-2013, 08:10 PM
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Location: Townsend, Montana.
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Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by 300stw View Post
ran out and tried a handful of loads 73 gr h1000 went 3019, 74 gr retumbo 3013 both leave ejector marks, running 2o thousands short of the lands, a new bullet drops in a fired case with a slight drag,,,so i have a longer barrel, wildcat, new dies and brass, didnt gain but about 100 fps over the last custom 7mags i had built with kreiger and bartlein barrels,,,

was really hoping to be in the 3100 range with the 180 berger

my 7saum with 27 in kreiger barrel is shooting the 180 berger at 2870,,, 63 gr of 4831sc,,

i think i will send it off and have travis do a 7 rorue with a new barrel after hunting season,,,

on a positive note the magnetospeed is tremendous, best piece of shooting gear i have bought, been thru to many chronys and prochronos,,,, but no more,,,

Before you give up I would try some WW brass. The added case volume might help a bit. I am able to run 3 gr more with WW than RWS. But as always work up to that load.

Was you old rifle in 7 mag checked with a good reliable chronograph??

These loads you just tested were they with 180 Berger VLD's or 180 Berger Hybrids?

The fastest 7/300 I have done was a 29" Hart and it got to 3175 with a 180 VLD and 77 gr of H-1000 in WW brass. The shorter barreled 26" rifle was about a 3100 fps rifle. Again it was a 6 land Hart.

Jeff
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  #447  
Old 09-25-2013, 08:19 PM
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Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by 300stw View Post
ran out and tried a handful of loads 73 gr h1000 went 3019, 74 gr retumbo 3013 both leave ejector marks, running 2o thousands short of the lands, a new bullet drops in a fired case with a slight drag,,,so i have a longer barrel, wildcat, new dies and brass, didnt gain but about 100 fps over the last custom 7mags i had built with kreiger and bartlein barrels,,,

was really hoping to be in the 3100 range with the 180 berger

my 7saum with 27 in kreiger barrel is shooting the 180 berger at 2870,,, 63 gr of 4831sc,,

i think i will send it off and have travis do a 7 rorue with a new barrel after hunting season,,,

on a positive note the magnetospeed is tremendous, best piece of shooting gear i have bought, been thru to many chronys and prochronos,,,, but no more,,,
Curious what barrel your using and the throat length on the reamer?
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  #448  
Old 09-25-2013, 08:21 PM
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Re: Anyone own a 7mm 300 Win Mag?

300stw
Broz is right on! Don't bother with the rws brass.
I had the same problem with rws brass. I have best results with Norma brass but Win is a close second. The extra case capacity definitely helps.
You will get the results you want with retumbo and norma or win cases.
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