Long Range Hunting Online Magazine

Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Gunsmithing


Howa long action 300win mag to 7mm STW

LinkBack Thread Tools Display Modes
Old 10-05-2009, 06:14 AM
Silver Member
Join Date: Jan 2009
Posts: 136
Howa long action 300win mag to 7mm STW


Has anyone used this action to build a 7mm STW ? Is the action long enough to handle the 8mm Rem Case

Any other options out there I should consider to shoot long and hard ?

Bearing in mind I already have a T3 Camo in 7mm Rem, Accumark 300weatherby and 300wsm Howa custom.
I'm in Australia so gunsmiths arent thick on the ground? The simpler the conversion the bettter.

Reply With Quote
Old 10-05-2009, 07:02 PM
Platinum Member
Join Date: Jan 2008
Posts: 4,388
Re: Howa long action 300win mag to 7mm STW

depends on your gunsmith. Its hard to find guys here to do work on the HOWA. I know Pete Lincon in Germany has chamberd all the way up to the 338 Lapua so take that for what its worth. I dont think you will have an issue at all if you are just loading single rounds.
Reply With Quote
Old 10-16-2009, 03:47 AM
Silver Member
Join Date: May 2007
Location: Taranaki New Zealand
Posts: 182
Re: Howa long action 300win mag to 7mm STW

Hi, the mag box on the howa is the same as the old Sako Finnbear- 91-92mm long. You would need to seat bullets to 90mm for smooth feeding. Bullet jump will be up to 12mm (.5") which would make even old Roy WBY turn in his grave. Anyway, you can work all this out for yourself as the .300 WBY ammo you have is near identical in both case length and COAL as the STW.

You have a good solid receiver so don't get rid of it but (sigh) you need to go back to the drawing board and have a re-think. Looks like you might be in for a wildcat. I am thinking about the same for my M70 winny. Am preparing to build a 7mm-300 Win mag improved. Velocity will be the same as the STW and RUM with 160gr bullets, slightly slower with 180 grain bullets. There is only so much energy you can force through a 7mm Bore and this wildcat is as good as it gets if throat erosion is to be avoided.
160gr- 3275fps
180gr-3050fps (conservative)

Its a good cartridge for all of us out in the wop wops. Brass is easy to obtain, the case can be fireformed with 'goat loads' and it won't create too much of a headache for your gunsmith as he can use a fresh 7mmRM case belt to headspace the wildcat. This puts it ahead of the Dakota etc by a long shot.

If you are planning a trip to NZ at any time, there are folk who can have your rifle re-barreled pronto. You would need a reamer from PT&G (google PTG reamer) and they will already have details of Aussie smiths on file so should be able to point you in the right direction.

OK- will try and re-do the post in Australian language (my old lady is an Australian/ Gold coast)

Hey Siggo- your pullin the raw prawn if ya think that japo action is gonna take that thousand mile bindie buster cartridge.

Have a beer.

What you need is a wild dingo with a firecracker up its a'''s. It a good number for us back country yobbo's.

Its a fair suck of the sav that you can't get the job done here in NZ. Get ya misses to google PTG + reamer after she gets you another beer.

Last edited by Kiwi Nate; 10-16-2009 at 03:52 AM. Reason: typo
Reply With Quote
Old 10-16-2009, 04:44 AM
Silver Member
Join Date: Jan 2009
Posts: 136
Re: Howa long action 300win mag to 7mm STW

Thanks for that all good Info...

What' s the Berger supply like in N/Z all dried up here...located two boxes of 162g'n SST's and 160gn Accubonds the other day..for my T3 7RM ..Camo Just finished fitting a Ernie the Gun Smith Varmint spring..

Lucky I have a few thousand Mag primers on hand..drying up around here..

Hey have you tired or used a Truflite barrel? This is what I was hoping for..N/Z based and they have the reamers I may need. May also save some serious import/export paper work from the US. Never replied to my email last week so I may have to pick up the phone or grab a cheap Virgin flight!

Its possibly just a touch short in the action for what I want to build but it would make a great 7mm/300wsm custom. 2.825 is the case spec on the Roy and the stw is even longer..

I have just finished a semi custom Howa 300wsm (Howa 300wsm, Wild Dog SL stock and Harrels brake, honed trigger etc. ) you can read about it in Victorian Deer hunter Mag( I think it travels across the Tasman) taking a nice Sambar at 212...not exactly LR but very decisive with the 180gn SST... Happy with its performance 110 gn recovery.

I might pass on this build although I love the quality/triggers and actions over some others out there. Stocks are another issue for the Howa platform .. fine if its a short action like my wsm.. Bell and Carlson make a weatherby Mk 5 style one any other ideas?
Reply With Quote
Old 10-16-2009, 05:10 AM
Silver Member
Join Date: May 2007
Location: Taranaki New Zealand
Posts: 182
Re: Howa long action 300win mag to 7mm STW

No worries. The Berger supplier here is Dead eye Dick shooting supplies- imports and sells to the public at a good price. They have a good supply of VLD bullets at the mo. There are no 162gr SST's in the country at all- none expected till after Xmas. Federal magnum primers are as rare as rocking horse s@%&t.

I have to admit- I am biased regarding True-Flite as the owner is a friend and collegue. So, when I say that I love the True-Flite barrels, its a bit moot. I wrote an article about them a while back- tried to be as unbiased as possible. Its on my website-
Terminal Ballistics Research Ltd

As for stocks, any stock made for the old sako AV or Finnbear will match up nicely- the Howa really is a rip off (extremely high quality rip off) of the old great. Actually, I think the Howa is better than the new Sako 75. When Sako wentstainless, they changed everything- typical cost cutting/ whoops I mean upgrading excersize. For people who like the Sako AV but want stainless, the Howa is exactly that. I guess as far as stainless goes you don't get much rain in AU or when it does, the heat dries things nicely and limits the rust.

Yes, isn't the 180 grain SST a boon, really puts the acid on both small/lean and big animals.
Reply With Quote
Old 10-16-2009, 06:58 AM
Platinum Member
Join Date: Nov 2008
Posts: 1,047
Re: Howa long action 300win mag to 7mm STW

Hey Herb,
Clancy has a 7mm STW reamer.

I like the idea of a 7 RUM shortened a bit to form a wildcat. You could customise the cartridge length to suit the longer 7mm bullets and still fit in your magazine.

It would have more grunt than a WSM and less throat erosion than a RUM.

You could call it either a 7mm WSM long or a 7mm RUM short?

Picked up the new stick today........Oh happy days..
scientia est potentia
Reply With Quote
Old 10-16-2009, 12:53 PM
Silver Member
Join Date: May 2007
Location: Taranaki New Zealand
Posts: 182
Re: Howa long action 300win mag to 7mm STW

Greg Duley (don't know his user name here) has shortened up the 7RUM a touch, similar to the .338 RUM necked down. The 7mm-375 Ruger wildcat is a true 2.5" magnum and velocities are the same as the STW and RUM. The only problem is getting a steady brass supply outside of the US.
Reply With Quote


Thread Tools
Display Modes

Similar Threads for: Howa long action 300win mag to 7mm STW
Thread Thread Starter Forum Replies Last Post
Wtb howa 1500 long action stock Frogman77 Gun Parts - Stocks, Barrels, Actions, etc. 4 05-12-2011 06:36 AM
Howa Action VjjR Rifles, Bullets, Barrels and Ballistics 13 10-22-2010 01:40 PM
WTB Howa Action jlboykin Gun Parts - Stocks, Barrels, Actions, etc. 0 03-18-2010 10:00 AM
WTB Howa 1500 mag action mongo Gun Parts - Stocks, Barrels, Actions, etc. 0 02-01-2009 04:35 PM
adjusting trg on howa 300win? mceads Gunsmithing 6 04-24-2007 06:41 PM

Current Poll
In the last 12 months, what was your longest rifle kill on big game?
0 to 200 yards - 25.98%
1,547 Vote
201 to 400 yards - 32.16%
1,915 Vote
401 to 600 yards - 23.01%
1,370 Vote
601 to 800 yards - 10.04%
598 Votes
801 to 1,000 yards - 3.91%
233 Votes
Over 1,000 yards - 4.89%
291 Votes
Total Votes: 5,954
You may not vote on this poll.

All times are GMT -5. The time now is 03:23 AM.

Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC