Main Menu
Newest Members
Q&A, 22khornet, DeadPerfectTaxi, colton bennett, StrungOutOutdoors
63772 Registered Users
Top Posters
dogcatcher 88062
stxranchman 52979
bill oxner 47262
RKHarm24 44577
rifleman 44375
BOBO the Clown 43649
BMD 40942
Big Orn 37484
SnakeWrangler 36469
txshntr 35235
Forum Stats
63772 Members
45 Forums
416946 Topics
6044260 Posts

Max Online: 16728 @ 03/25/12 08:51 AM
Topic Options
#7012264 - 12/26/17 02:50 PM 7-300 Win Mag
jeffbird Offline

Registered: 03/09/09
Posts: 3111
Tossing this question mainly to Chad, but thought it might be of general interest.

What is the COAL and velocity with the 195/7ís?

Same question for 175- 180ís?

What twist rate is needed? 1-8Ē?

What powders work well?

Is there a reamer that matches Forster or Redding dies or are custom dies required?

Professionally trained and certified concealed carry and license to carry instructor.

#7012294 - 12/26/17 03:15 PM Re: 7-300 Win Mag [Re: jeffbird]
5 Stand Dan Online   content
Pro Tracker

Registered: 06/23/12
Posts: 1674
Loc: DFW
Here is a link that may help

7mm Practical

#7012428 - 12/26/17 04:48 PM Re: 7-300 Win Mag [Re: jeffbird]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 13057
Loc: Lewisville, TX
First, the 7 Practical is different than a standard 7/300. The Practical has it's shoulder angle increased and I think the case body is wider. It's a fire forming case, for sure.

A straight up 7mm/300 Win Mag is what I built. It's a simple necked down 300 WM case with no other modification. I'm running the 195's in an 8" twist at 2990 fps with Retumbo. I can get up to 3030 but with some pressure signs. It shoots great. If you run R33, you can get up around 3040 no problem. But I didn't want to use a double based powder. Good powders for the 195 would be in the Retumbo burn rate area- R33, IMR 8133 (new).

The reamer used on my chamber was the bore rider reamer from PTG. COAL is right at 3.680", to keep it under the 3.7" max magazine for me. I can seat it touching around 3.720" or so.

My barrel is a 1:8" twist. I have 3 barrels still available, if needed. A 1:8.25" is recommended minimum twist for the 195 or 197 bullets. A 1:9" will NOT work for the 195's (bullets were tumbling at 200 yards).

Dies, I am using Redding 300 WM dies with a 7mm neck bushing. It's easy.

We have built several of the 7/300's and like them a lot. I have not had much playing time with it recently. I've been to busy with customer rifles and hunting season lately.

Custom and Precision Ammunition!!
Type 01 and Type 06 FFL


© 2004-2018 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide