7RM or 7mm/300 win

Discussion in 'Long Range Hunting & Shooting' started by mrb1982, Mar 17, 2014.

  1. mrb1982

    mrb1982 Well-Known Member

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    Just wondering what peoples thoughts are about having a 7RM reamed to a 7mm/300 win. I got a sendero 7RM that shoots pretty good that I have a brake on and an adjustable cheekpiece, tactical bolt handle, jewell trigger. Really shoots nice with the 180gr bullets. I am intrigued by the thoughts of a couple hundred more fps with the 180 bergers I'm shooting.

    I am looking for 1000-1200yds max, hunting game up to elk size, not necessarily to that range. But at least practice out to 1000-1200.

    Without other caliber recommendations, would spend the money to just have a simple ream on it or just shoot it the way it is?

    I figure if I had it reamed in the next year, the shoot the heck out of it and when Berger get's the 195's together, go for a rebarrel. Or I could just wait and do it all at one time also. Might be the easier way to do it?????

    Just curious of opinion on these two calibers specifically at this point. Thanks.
     
  2. IdahoCTD

    IdahoCTD Well-Known Member

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    It's just about as much work to set the barrel back and re-chamber as it is to start from scratch. I just did a Remington sporter barrel for my dad and set it back about .180" to make sure the neck cleaned up and to put the site holes down. You really need to set it back enough to cut a new neck so you don't have a stepped neck from two different reamer sizes. Then you need to chase the threads and re-cut the bolt nose recess. In all it took quite a bit of time.

    I'd leave it as is, unless your going to 7STW, and wait for a new barrel to do a different caliber.
     
  3. MudRunner2005

    MudRunner2005 Well-Known Member

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    Dude, don't waste your time, money, and effort for 9 grains of powder that will NOT gain you "a couple hundred fps". If you need 3,000 fps with the 180gr bullets, go ahead and step up to the big leagues....Rechamber to 7mm STW. You won't regret the decision.

    My 7mm STW is putting 5 in a dime @ 100 with my Berger 180 Hybrid load, and it's right at 3,000 fps. 1,200 yards it'll knock it into the dirt...
     
  4. mrb1982

    mrb1982 Well-Known Member

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    I guess when Ai figured 200fps I was going on the thought of 2900 for an average 7RM and the 3100 average a lot of guys are getting from a thread I have read on here. Might not make a huge difference but I was thinking it would maybe help with wind drift a little. Plus 300 win brass is fairly common. Wouldn't have to burn a pile of powder. Just kinda throwing out some random thoughts when comparing to a 7stw. Probably wouldn't ever need the extra power anyways who knows
     
  5. bigngreen

    bigngreen Well-Known Member

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    Your on the right track, it's an easy performance upgrade for a 7mag and one that has worked and is working very well!
     
  6. thekyrifleman

    thekyrifleman Well-Known Member

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    I am also looking at this possibility. Have had a 7mag since '66, a 7stw since '92. Both aimed at hunting, picked up an early Rem ADL in 7 mag for a donor to build something for "long range".....no desire to go to 338 etc., recoil seems excessive, and I don't fancy brakes. Also have a Rem BDL 8 mag, 24". Have considered a build on this caliber, using either Sierra 200 gr match or their 220 grain boatail. The 7mm-300 AI is also intriguing....thoughts to help me decide....gun)

    Thanks!!
     
  7. brentc

    brentc Well-Known Member

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    The 7mm Rem pushing 180s at 2900 is nothing to sneeze at especially if it shoots well. I'd keep it as it is until you absolutely need a set back or rebarrel. When the time comes, an easy solution might be to consider a custom chambered 7RM to push the 180s up past 3000 fps. I'm getting 3030 fps out of my 28" long throated 7mm Rem with my 180 VLD/Retumbo combo and 2985 fps with H1000.
     
  8. mrb1982

    mrb1982 Well-Known Member

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    Yeah I kinda thought about this too. I am seriously thinking about just shooting like crazy with this thing, then hopefully by the time it is ready for a re barrel I will get it reamed and speed up the twist to something more suitable for the 195 grain when they come out. It appears this may be a while which in this case is fine with me. If the 195 is anything close to what it is projected I think an stw. Or 7/300 will be an absolute beast combining flat shooting, wind bucking, hard hitting monster with fairly manageable recoil, brake or no brake. Just kinda the thoughts in the back of my mind on this deal
     
  9. MudRunner2005

    MudRunner2005 Well-Known Member

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    Build a .300 Ackley Magnum. It's basically a blown-out & improved .300 Wby with a 40* shoulder, instead of that radiused venturi shoulder that the Weatherby calibers have. Also, it has been proven the brass lasts longer with the 40* Ackley shoulder, compared to the venturi shoulder.

    I shot mine last weekend to form brass to send off for custom dies, it does not have a brake on it, and the recoil was no worse than my unbraked 7mmSTW with 180gr bullets. Very managable, and it's definitely got that cool and unique factor. It is a favorite amongst the 1000 yard benchrest crowd. Held the world record for many years. I figure in a Sendero SF package it will make a packable +1K yard monster.
     
  10. mrb1982

    mrb1982 Well-Known Member

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    That would be a pretty cool caliber. Very interesting. Always a list of "stuff" I want hahaha
     
  11. MudRunner2005

    MudRunner2005 Well-Known Member

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    Yeah, here it is setup with an SWFA SS 20x42 MRAD fixed-power scope. I was waiting on my EGW base to come in, and it came in last night. I used some Seekins Precision rings I had. So I put it together last night after work. Gonna go shoot it and form some brass as soon as it comes in. Still might go shoot some of the old .300 Wby brass I formed last weekend, even though it's getting close to the end of it's lifespan, as the primer pockets are looser than I'd like them to be.

    [​IMG]
    [​IMG]
     
  12. Broz

    Broz Well-Known Member

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    These posts hold truths. I have built 3 7mm / 300 wins and also have owned and set up many 7 Rems. There is nothing wrong with a 7 Rem but with 180's the 7/300 is easily 200 fps faster. We have seen 3200 fps @ 4100 ' ALS. with a 29 1/2" 7/300. We finalized that load at 3175 and drops were spot on to 1500 yards. The slowest one I built was a 26" and was still over 3100 fps and .3 moa at 300 yards with 3 consecutive groups. At this point the 7/300 has passed the round count where we saw the 7 STW start to show accuracy loss. The 7mm/300 is still a .5 moa rifle at 1000. The 7mm/300 win is well above a 7 RUM for barrel life too. A simple bushing change to the 300 win dies to have a great set of dies to neck down 300 win brass and you are set. I have field experience with many 7's and as soon as the 195 Bergers are released I will be testing another for myself with a 28" plus tube. Right now we just ordered a 8.5 twist tube for a short barrel (22") build in 7mm/300. That should be interesting. After owning many different 7's I feel the 7mm/300 win is a very good option if you actually shoot enough to care about barrel life. And if you want the most you can get in performance with a rifle that will still be shooting accurately after 1000 rounds.

    Just my opinion after wringing the 7/300 out with real world field experience.

    Jeff
     
  13. MudRunner2005

    MudRunner2005 Well-Known Member

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    Jeff, I would say that's not a fair assessment...I have over 750 rounds down my 7mm STW and she's still stacking 5 inside of a dime @ 100 yards. I would say the STW can get more than 1,000 rounds of accurate barrel life if treated right.
     
  14. Broz

    Broz Well-Known Member

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    That's fair, and I will stand by what I said. By 1000 I saw groups opening up. Put a bore scope in your STW tube that has 750. Then tell me if you see no beginning signs of deterioration. Then do it again at 1000 and tell me if it is not worse.

    Now reread my post. I never said the STW was done at 1000. What I said was it had a loss in accuracy and groups opened up where as the 7mm/300 did not.

    I didn't think your statement here; "Dude, don't waste your time, money, and effort for 9 grains of powder that will NOT gain you "a couple hundred fps". was a fair assessment either. Especially since you have never even owned a 7mm/300. But I do feel you are still entitled to your opinion. The 7/300 has close to 12% gain by your own number I try to show the difference in my posts by offer weather it is indeed an opinion or real first hand results.

    Its all cool.

    Jeff