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Anyone own a 7mm 300 Win Mag?

 
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  #302  
Old 03-24-2013, 11:50 AM
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Join Date: Jun 2010
Location: utah
Posts: 124
Re: Anyone own a 7mm 300 Win Mag?

Had some time to start doing some load development for the new 7-300 win. I think the gun turned out great. Really liking it. Thanks To Jeff for all his help and this thread. Ran into a few problem with the gunsmith, but I have my gun. Cant wait to get it out on the steel. Jared from APA rifles makes some of the best rings I have ever used. Really love them. And always you cant beat the Bighorn!

I remove the brake and run a Thunderbeast 30p-1 suppressor. Shooting suppressed really is the only way to go now. Tried H1000 and Retumbo. Both worked good, but was seeing pressure earlier with H1000. Only have 1Lb of Retumbo left and cant find it in stock anywhere. Here is what I have so far.

Macmillan Edge A3-5 Adj check piece
Krieger 5.5 contour 27inch Barrel
Jewell Trigger 1lb
Wyatt Box
Bighorn Sporty Action
APA Rings
APA Little Bastard
Thunderbeast 30p-1 Suppressor
Nosler Brass
CCI-BR2 Primers
CCI-250 Mag Primers
Berger Hybrid 180
Reamer .200 Freebore
.316 neck

H1000
74 Avg 3095
74.5 Avg 3157 SD 6
75 Avg 3162 Started seeing Pressure
75.5 Avg 3191
76 Avg 3215

Retumbo
73.5 Avg 3128
74 Avg 3152
74.5 Avg 3180 Started seeing Pressure Stopped






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  #303  
Old 03-24-2013, 11:35 PM
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Join Date: Nov 2010
Location: Ashflat, AR
Posts: 385
Re: Anyone own a 7mm 300 Win Mag?

Great looking rig ya got there. cant wait to get mine back and start shooting. did you paint the stock? I like the digital camo.
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  #304  
Old 03-27-2013, 01:02 AM
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Join Date: Jun 2010
Location: utah
Posts: 124
Re: Anyone own a 7mm 300 Win Mag?

No I had the whole thing build and painted. I just ordered all the parts and sent them off.
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  #305  
Old 05-30-2013, 02:30 PM
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Join Date: May 2013
Posts: 8
Re: Anyone own a 7mm 300 Win Mag?

I have a 7mm 300 Win Mag. I'm not exactly sure what the chamber cast is, but I do know that my smith measured his reamer specifically for the Berger 180gr. VLD's. I have found that mine likes a seat depth of .130 and will put a .689 six shot aggregate at 200 yards with an average muzzle velocity of 3176 Fps off 76gr's of H4831. I found that it takes over 80 grains of H1000 and Retumbo to achieve similar velocities. I also noted that 76.5 grains of IMR 7828SSC produces similar velocity, but shows overpressure signs (Shinny Ejector impression on the base). 7828 was the only powder I've tested so far that showed any obvious visable signs of over-pressure. Ramshot Magnum barely crested the 3000Fps mark at the powder weights I tested.

Testing was done at an elevation of 3500Ft. Temperature was 45 degrees Farenhiet. I don't know the Baro. pressure of the day. Chrono used is an Ohler 35M.

As for dies: Redding series "S" bushing dies for siezing. buy the .300 Win Mag body and the .311 bushing. Total $70.00 U.S. I use a Forster Mic Seating die in 7mm Rem that my smith reamed with the chamber die used on the rifle. cost was around $50 U.S. with the reaming work.

My build is a Defiance 'Rebel' Action with milled to match 20 MOA picatinny rail, 30 inch Lilja 7mm 3 grove Sendaro contour fluted barrel with a Cooper Break, Jewel Match fully adjustable Trigger, mounted to an AICS 700 Long Action Folding stock. Funny thing about that folding stock... Turns out that without it, I would have to remove the cheek piece to remove the bolt - food for thought.
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  #306  
Old 05-30-2013, 04:37 PM
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Join Date: Apr 2007
Location: Lincoln Co., NV
Posts: 174
Re: Anyone own a 7mm 300 Win Mag?

[QUOTE=garou22;812695]
As for dies: Redding series "S" bushing dies for siezing. buy the .300 Win Mag body and the .311 bushing. Total $70.00 U.S. I use a Forster Mic Seating die in 7mm Rem that my smith reamed with the chamber die used on the rifle. cost was around $50 U.S. with the reaming work.

QUOTE]


I did the same thing with my seater die. When it was just a 7mm rem mag die I would sometimes get runout over four thousandths and sometimes double that. I used my reamer and cut the 'sleeve' of the forster seating die and now all my loads stay under three thousandths. Worked really sweet and for someone learning to use a lathe it was an easy project.
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  #307  
Old 05-31-2013, 03:22 AM
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Join Date: Feb 2008
Posts: 193
Re: Anyone own a 7mm 300 Win Mag?

great looking gun...seem to shoot well also
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  #308  
Old 05-31-2013, 09:32 AM
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Join Date: Dec 2004
Posts: 168
Re: Anyone own a 7mm 300 Win Mag?

i am having chad dixon longrifles blueprint and barrel my action right now, 27in brux #3, 9 twist, 317 neck .200 throat, should have it next week, cant wait
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