7/300 or 300 win

[mrb1982]

7/300win with the Berger 195's or 300win with 215's. When running numbers with 195's at 2950fps and 215's at 2900, they are pretry close at 1000 but the 195 starts to pull away a little after that. I was set on a 7/300 for these bullets but kinda getting cold feet and starting to think about the straight 300 win again.

Either way I will have to rebarrel so that doesn't come in to question here. The way I see it is if I am already rebarreling I may as well go with whatever bucks the wind better.

Shoot me your thoughts on the deal. I have the brass just deciding which bullet they are going to shoot. Curious to hear the opinions. Thanks.

 

[Broz]

I have been getting a little more velocity from 300 win mags with 215's than the 7-300 with 195's at the same pressure with the same powder. I think you would be safe using the same velocity to compare them both in your ballistic calculator.

Jeff

 

[MudRunner2005]

My personal bias says go with the 7-300 WM.

I have been debating on pulling my brand new 700 5R .300WM apart and building a 7-300WM Imp. But I still can't make up my mind.

 

[FURMAN]

The sweet spot for my 300 Win was 2880 fps with 215 Bergers. Ballistically my 7WSM was better. I replaced my 300 Win with a 7mm-300.

 

[mrb1982]

It seems I read a lot of people getting a range of 2850 to 2950 in the 300 win mags. I used 2900 as kin of a happy medium I guess.

Broz, is you 300 win reamer throated specifically for the 215? Do you think I could get more than 2950 out of a 7-300 at 28" if I had a reamer throated specifically for the 195.

Is anybody else worried that if this discussion specifically comes up frequently, will they even make the 195 for a long time? Who knows I guess

 

[kaseyfied]

We run an improved 7/300 with 180 bergers at 3300, shoots the crap outta stuff!!

Kasey

 

[FEENIX]

7/300win with the Berger 195's or 300win with 215's. When running numbers with 195's at 2950fps and 215's at 2900, they are pretry close at 1000 but the 195 starts to pull away a little after that. I was set on a 7/300 for these bullets but kinda getting cold feet and starting to think about the straight 300 win again.

Either way I will have to rebarrel so that doesn't come in to question here. The way I see it is if I am already rebarreling I may as well go with whatever bucks the wind better.

Shoot me your thoughts on the deal. I have the brass just deciding which bullet they are going to shoot. Curious to hear the opinions. Thanks.

I don't think you can go wrong with either one, it's just a matter of what itch you want to scratch.

It also depends what you already have in your firearms inventory; I have three .300 Win Mags and a .300 WSM, so IIWY, I'd go with the 7/300 ... just because I don't have one.

I am fine tuning my 215 load for my .300 WSM and I'm pushing them at 2775 FPS out of 24" barrel. Because of our altitude, we have guys here pushing the 215s out of their .308 Wins and .30-06s at 1K+ yards effectively. If I have to re-barrel my next .300 Win Mag with the same chambering, it is going to be at least 26" and specifically to propel the 230 (even though .300 RUM is better suited for it ... there just something "special" about the .300 Win Mag for me. gun)).

Good luck!

Ed

 

[mrb1982]

Mud,

From my stand point, if I had a good shooting 300WM I would probably hang with it. I am not sure if right now, if I have seen enough positive performance gain from the limited sample of data, to rebarrel a 300 win mag to a 7-300 for these bullets specifically, unless you have a spot in your gun cabinet you need to fill with one. lol I am shooting a 7RM Sendero right now. Legitimate sub 1/2 minute gun out to 1000 yards, but I am only getting 2815 with 180 hybrids and I am looking for a little extra performance. I have done a lot of upgrades to this gun so for the most part, people aren't interested in buying it for the price I would have to have. lol So I always said I would shoot it until they came out with the 195's, then rebarrel to a 7-300 for these.

I know Jeff is getting around 2950 with his 7-300 with a 26.5" barrel. I am planning to use a 28", so that might squeak me over 3000. I have some H1000 laying around from my 7RM that I will run, but if somebody magically finds something that will sneak an extra 50 fps, then I might be in the market for some new powder lol

 

[bigngreen]

It's hard to tell right now, the 300 Win with a 215 is a very well known and proven combo but the 7-300 Win with the 195 has barley got air time and only with loaded changed a little from a 180. Given time the best powder and throat combo will get worked out and we may see a little more out of the 195, though may find that it is what it is and the 195 needs something like a Norma mag case to drive it.
I know the rifle Broz is using to test the 195's has a very long throat so what he's getting will be as much as is possible with the powder he's using.

 

[mrb1982]

I think that would be fairly valid. I will probably move forward with the 7-300 as I have a few months before I am ready to actually put the barrel on it. Maybe by then some people will have some ideas. 2950 is no slouch with the ballistic performance, but I think we all anticipated more from it I guess. Still a good round though. I will be curious to hear what throat makeup will end up best. I might be best served to figure out a few things and have my own reamer made and go from there.

I know Jeff's had a pretty long throat for the 180's from what I read. I wonder if having a reamer made with the same type of long throat in relation to the 195 would be beneficial? Throat it proportionally longer with the increase in bearing surface. Then maybe that would give that little extra umph that everybody is looking for.

 

[matt_3479]

I have been using a factory 700 XCR tac in 300. Win mag pushing the 210hvlds around 2830 and the 215's a little over 2900fps. I am going to have to rebarrel it shortly as it is close to being on its last legs with 1378rds down the tube my groups are opening up and my pressures spike from time to time. I was going rethroat but it's a factory tube so I'm just going re barrel it. I debated on the 7-300 for a while but after some thought the extra bullet diameter and weight keep me coming back the the standard 300. Winny when I've had such great luck from it already and I'm looking for a spare 700 donor action to put together a 7-300 anyways just cause in the end I decided why not have both! The 300. Win mag will be first. Plus I have 1400 pieces of brass so another excuse in my book is I can't let all the brass sit around. Lol won't be till after Christmas as my 260 rem is on its way back from the smith so I need to put some cash aside

 

[Wedgy]

There's a good freebore discussion here ;

Berger 195's Freebore

 

[bigngreen]

I know Jeff's had a pretty long throat for the 180's from what I read. I wonder if having a reamer made with the same type of long throat in relation to the 195 would be beneficial? Throat it proportionally longer with the increase in bearing surface. Then maybe that would give that little extra umph that everybody is looking for.

I don't believe lengthening the throat anymore would yield much, the throat is very long well over .300 freebore, the newest reamer that I have based on the 195 is .260 freebore so I think powder burn rate or barrel length are the two strategies that will get a guy into the 3000 fps range.

 

[mrb1982]

Interesting. I hear a lot of guys using the RL33 or other, but has anybody tried Retumbo? Seems the 7RM guys enjoy a 50 fps or more on average increase with it. Always wondered how it has worked in the 300 win mag case. Seems if a guys was just trying to squeak a few more fps, it would be worth it. Just a thought I guess.