Anyone own a 7mm 300 Win Mag?

[MudRunner2005]

Yea, I won't pay for Weatherby brass, looks to me like you could use 7RM brass, but you'd have a short neck until you reload it a few times or you could make it from 300 Win brass, but you'll have a lot of trimming, reaming & or neck turning. The main advantage of 7 mm Weatherby over 7 mm RM is a longer neck.

As close as the velocities are, it is virtually a wash. Despite the longer neck, the Wby holds slightly more powder, which means more burn. So, the longer neck is pretty much pointless when comparing the barrel life of the 7mm RemMag to the 7mm Wby Mag. I'd say on pretty much all factors, they are literally 6 in one hand, half-dozen in the other... It just comes down to whether you want to have consistent ammo availability at just about every store that sells ammo (advantage 7mm RemMag), and if you are cool with paying 2x the amount for "specialized" brass and ammo that aids in zero advantage over the more common cartridge (disadvantage 7mm Wby).

 

[M9Powell]

I agree that brass & factory ammo availability favor the Remington. I think the Weatherby has a velocity advantage. Should be better on barrel life than the bigger 7s. I used to reload for a guy that had a Savage 7 mm Remington , his brother had a Weatherby Mk V in 7 mm Weatherby. He swore they both shot my 7 mm Remington reloads just fine & killed several elk. They didn't know the difference." They r both 7 mm magnums." Is what they said. Now I'm by no means advocating that, but they said it worked fine. If that's true one could in a pinch feed his Weatherby cheap Remington factory loads & fireform the brass into slightly short 7 mm Weatherby cases.

 

[300stw]

i have done the 7-300 win with couple different reamers and barrels, 7 stw, and a number of standard 7 rem mags, if i really wanted anything more than the standard 7 rem mag it would be 28 nosler all the way,

no resizing, no doughnuts inside of the neck, fireforming ect,

velocity increases of a 100 fps or so over a standard 7mag that involves extra steps not worth it for me,,,

if i though an elk could tell the difference of a 175 eldx at 3000 fps from my standard 7mag or a 175 at 3200 from a 28 nosler i would step up a notch,

so far 1 mule deer buck at 843 yards with the 175 eldx from my standard 7mag yielded 1 bang flop , deer never left his tracks, i dont need anymore velocity or issues,,,

 

[M9Powell]

May work fine, but I'm not thrilled with rebated case heads. IMO it's done purely so they can use a std bolt head. In other words for economy of production. From a pure cartridge design standpoint it's retarded. Introduces the theoretical at least, possibility of the bolt over riding the rim. Takes away a major safety point in the case of a case rupture. Ideally the rim should be a few thousandths larger than the base of the case. Even better IMO is a belt. The almost non-existent taper & steep shoulder don't improve feed & extraction either. Nor does the oversize diameter of the case, not to mention reducing magazine capacity. You are also stuffing a 404 Jeffery case in an action designed for a 30-06. Remember most Ackley ctgs with minimal taper & steep shoulders were devolped for single shot target & varmint rifles. I come from a tactical background so maybe I overemphasize feed reliability. So be it. From a tactical POV 30-06 is a great case design, rim a few thousandths larger than base, plenty of taper, gentle shoulder, long neck. A 50 BMG is just a 30-06 scaled up. In a precision rifle I'll vary from these design prerequistes to a degree, but not too far. An 03 Springfield feeds 30-06 like a cat slurping sardines. Not to give Spingfield Armoury any credit here though. They basically just copied the Mauser & cartridge. The only reason it's longer than a 8X57 is at that time our powder sucked compared to the Krauts. If you're gonna use a 404 Jeffery case do it right like Dakota does.

 

[300stw]

dont want to pay dakota prices, 28 nosler hell of a lot cheaper, than dakota, from the 7 rifles in 28 nosler i have seen on a win and rem action they feed fine, spent the day at a gunsmith recently installing couple barrels and shooting rifles in 26 and 28 nosler, if you want a 7mm that feeds, then get a 7x57, none better, 7-300 win doesnt offer anything a regular 7mag wont do, within 700-800 yards, without brass issues, thats my take after about 2700 rounds of 7-300 win mag out of a couple different barrels, the last few years, i know broz is sold on them, if they were free today i would pass unless i could rebarrel,,,,

 

[FURMAN]

The good thing is we all get to choose what to do with our money. I could not disagree more about the 7-300 not offering anything the others can not provide. The 7-300 is easily 150-200 fps faster than the 7 Rem mag. It is within a few fps of the STW when in the accuracy node. It has cheaper and more brass options than the 28 Nosler. I have seen zero "brass issues". If building a rifle in 7mm I can not see myself choosing something other than the 7-300 if buying one off the shelf I would look at a 28 Nosler.

 

[300stw]

not one of my 7-300 would shoot a 180 berger at 3150 -3200 fps with 26in barrels, i have 3 7 rem mags that will make 3000 fps or a little more with 26in barrel, same guy handloading same techniques ect, i was lucky to hit 3100 with the 180 berger , thats with differnt barrel manufactures and reamers,,,,
every 300 win mag brass i sectioned after neck sizing to 7mm showed a pronounced doughnut at the neck shoulder junction , i think i still have 400 or so brass that has had the hell shot out of them,,,,

 

[bigngreen]

The 7 mag and 7-300 wins I've played with were all 150 ish appart also, never have seen a dough nut issue either in any I've built. My 7-300 win reamer runs 195's just 3030-3060 fps, accuracy is superb. My 28 Nosler is about the same step up, haven't decided which one I like more between the 7-300 or 28 Nosler.

 

[M9Powell]

dont want to pay dakota prices, 28 nosler hell of a lot cheaper, than dakota, from the 7 rifles in 28 nosler i have seen on a win and rem action they feed fine, spent the day at a gunsmith recently installing couple barrels and shooting rifles in 26 and 28 nosler, if you want a 7mm that feeds, then get a 7x57, none better, 7-300 win doesnt offer anything a regular 7mag wont do, within 700-800 yards, without brass issues, thats my take after about 2700 rounds of 7-300 win mag out of a couple different barrels, the last few years, i know broz is sold on them, if they were free today i would pass unless i could rebarrel,,,,

I already have 2 7X57s. A 1893 Mauser & a featherweight M70. And yes they both do feed superb. our GIs called it the Spanish hornet. Totally outclassed our Krags in 30-40 govt ( a lot of our Army reserve & NG had too face off against it with trapdoor 45-70s) which is why we copied it. Nuthin will convince you of the quality of a weapon more than being on the receiving end of it.

 

[M9Powell]

The 7 mag and 7-300 wins I've played with were all 150 ish appart also, never have seen a dough nut issue either in any I've built. My 7-300 win reamer runs 195's just 3030-3060 fps, accuracy is superb. My 28 Nosler is about the same step up, haven't decided which one I like more between the 7-300 or 28 Nosler.

The 7/300 is a great cartridge. Cheap readily available brass & gets just about all you can get out of a 7, if you have a long enough mag 4 it. The 7 mm Weatherby gets almost as much & will fit in the detachable mags I'm gonna run. It can also be formed from 300 Win brass, just more work. 338 Win mag brass might grow enough to make 7 mm Weatherby cases also by the time you neck it to 7mm. That would save a lot of trimming.

 

[M9Powell]

As close as the velocities are, it is virtually a wash. Despite the longer neck, the Wby holds slightly more powder, which means more burn. So, the longer neck is pretty much pointless when comparing the barrel life of the 7mm RemMag to the 7mm Wby Mag. I'd say on pretty much all factors, they are literally 6 in one hand, half-dozen in the other... It just comes down to whether you want to have consistent ammo availability at just about every store that sells ammo (advantage 7mm RemMag), and if you are cool with paying 2x the amount for "specialized" brass and ammo that aids in zero advantage over the more common cartridge (disadvantage 7mm Wby).

No doubt the Remington wins the bang for the buck contest. Not that it means much, but in my usual haunting of gunshops I compared cost & velocity of the cheapest factory ammo I could spot from both locally.
1. Factory fresh Federal 7 RM 150 gr SP. 21.99$ @ Wally world. 3110fps.
2. Been sitting on the shelf so long the box's are falling apart Norma 7 WB 154 gr SP. 51.99$ @ a small obscure gun shop. 3258 fps.

Any thoughts on the Weatherby double radius shoulder? It definatley gets the job done with a minimum expenditure of length as in a steep shoulder. My thoughts are the smooth curves might possibly feed better than a steep conventional shoulder?

 

[Lrt307]

I was out tinkering with my rem 700 7rum factory gun. It's a 26" and it's in a wood laminate Stock bedded. It has a vortex 4x16x44 on it. I loaded up 89.0 grains Retumbo with a Berger 180 Hunting. 659 bc. It shot unreal for a factory gun. I was getting 3127fps fro. My buddies magneto speed. She has much more left in her no psi but why change when a factory gun is shooting .5moa? My load was off my comparative length 3.035 and Federal 215 Primer. I shot @ 4250' and 45°. I also shot 90 grains later that night no psi and shot great also. Not sure on the speed probably another 35-45 fps I would guess?

 

[M9Powell]

Seems to me the problem with the 7 RUM is you can match the speed with a shorter case & less powder, recoil & barrel wear. I wonder though if you made the barrel longer say 30"+ if the RUM might start flexing some muscle?

 

[Lrt307]

Seems to me the problem with the 7 RUM is you can match the speed with a shorter case & less powder, recoil & barrel wear. I wonder though if you made the barrel longer say 30"+ if the RUM might start flexing some muscle?

Or just putting more Powder to it. From what I am seeing 89 grains retumbo is nowhere near it's max potential. Other cartridges matching performance per say are maxed out which leads to throat erosion poor barrel life etc. I am gonna work up my retumbo loads just to see what it can actually do and see what happens to accuracy. I also have some rl33 I may try for ***** and giggles. I am already exceeding a hot 7mag load by close to 100fps with 90 grains retumbo. Ya it is using quite a bit more Powder but shoots real good.