- Location
- marsden,sk.canada
I am possibly rebarrelling my 300wm. My question is..does anyone shoot the 7-300wm,7 practical, or the 7 lrm?. Looking for input on anyone of these three.
7mm?
- Thread starter blackbeard
- Start date
hometownhero
CGN Ultra frequent flyer
- Location
- Toon Town, Sk
Brass is crazy expensive for 7lrm I have looked into it. I would do a 7 practical the hornady 180gr eld match has a very high bc and the 7 practical has been known to launch 180's at 3100-3200fps. G7 bc on those is .401
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
What's wrong with the good ole 7RM?
It works very well.
Jerry
It works very well.
Jerry
- Location
- marsden,sk.canada
i currently have a custom 284 and love it. was just tinkering with this one and its mag bolt face
7mm-300 (aka 7mm Yukon, 7x66 Argentine, 7mm Randle) is a little faster than a regular 7mm Rem Mag and a little slower than a 7 STW. I'd choose either of the other two before the 7-300 WM. Just easier to find components and rifles. - dan
hometownhero
CGN Ultra frequent flyer
- Location
- Toon Town, Sk
Pretty easy to get a rifle in 7 practical just get a barrel chambered in it and screw it on an action. 300 win bushing die with a bushing for the 7mm neck you want
300 win brass is plentiful and easy to neck down to 7mm. 7mm bullets are easy to find.
What is your reason for wanting to change from 300 WM to 7mm? Not sure if you reload or not but I would stick with the 300 WM. Get a barrel with a 1 in 9 twist and shoot the 215 or 230 Berger or the 200 plus gr ELD-X or ELD-M. Unless you really are looking for a change I would stay with the 300 Win Mag. If changing to 7mm take into account your twist rate so you can shoot the heavies.
I have a 284 built on long action and i can load the 180 scenars out well past 3". This thing is a HAMMER, 8.8 mils to 1000 meters. It is easy to load and easy to shoot, components are easy to find and it is just a blast to shoot.
- Location
- marsden,sk.canada
i have a custom 284 that i love. i also have a semi custom 7 wsm,shoots lights out, just not something that tickles my fancy.
I've got the 7-300 Win version and it seems to be hanging in there. 3150 with 180 VLDs and H1000. Got a few hundred rounds through it since fall, and a single deer that went 169. Nothing fell off; the rifle or the deer. Rebarrelled a .300 Rum that Corlane's made on a Sako that got burnt out, so I don't know if its building or repairing.
I'm a long time user and fan of the STW, but can't help noticing that 3.600" mag boxes and VLD style bullets aren't a match made in heaven. At the same time it was hard not to notice that my .300s with the 3.600" would do anything I wanted with the lands with every bullet. Hmmm.......... Factor in that STW length brass is a scarce thing, and that I'm sitting on a pile of Norma .300 Win, that Apapro had a reamer, that my STW barrels are just passing acquaintences and it started to make quite a bit of sense. Then theres that taking a bushing out of one box and putting it in another die has my .300 bushing dies doing double duty. I can also bluff my way through with extra 7 Rem stuff, and every .300 FL die just turned into a body die. Seating stem from a 7 mm Comp seater die screws into a .300 Win die, and the use of competition shell holders eliminates even resetting the sizers between rifles and now calibers. Heck, I was practically loosing money not doing it.
Barrel life might not be one bit better, but the ability to chase lands sure suggests that it might be.
All in all, there's a lot going for it. Right up until I quit comparing it to the other 7s I have and hold it up against the .300 parent cartridge. Then there doesn't seem to do much real world advantage at all. I feel sorry for those that live in the real world.
Not entirely sure why I did the 6.5-300.
I'm a long time user and fan of the STW, but can't help noticing that 3.600" mag boxes and VLD style bullets aren't a match made in heaven. At the same time it was hard not to notice that my .300s with the 3.600" would do anything I wanted with the lands with every bullet. Hmmm.......... Factor in that STW length brass is a scarce thing, and that I'm sitting on a pile of Norma .300 Win, that Apapro had a reamer, that my STW barrels are just passing acquaintences and it started to make quite a bit of sense. Then theres that taking a bushing out of one box and putting it in another die has my .300 bushing dies doing double duty. I can also bluff my way through with extra 7 Rem stuff, and every .300 FL die just turned into a body die. Seating stem from a 7 mm Comp seater die screws into a .300 Win die, and the use of competition shell holders eliminates even resetting the sizers between rifles and now calibers. Heck, I was practically loosing money not doing it.
Barrel life might not be one bit better, but the ability to chase lands sure suggests that it might be.
All in all, there's a lot going for it. Right up until I quit comparing it to the other 7s I have and hold it up against the .300 parent cartridge. Then there doesn't seem to do much real world advantage at all. I feel sorry for those that live in the real world.
Not entirely sure why I did the 6.5-300.
Last edited:
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
here is an interesting rule of thumb that was published years back in Reloader or Handloader (Barness likely wrote the article). When looking at larger cases and wanting to ballpark real gains in velocity vs what you currently have, take the increase in gun powder as a percentage, divide by 4 and that is the ball park velocity gain all things being equal.
So if you can gain an extra 10grs of fuel in the larger case and say go from 60gr to 70gr, the percentage increase is 16.7%. Take 1/4 of that which is 4.2 and that is the rough % increase in velocity you will gain.
So if the 60gr case pushed whatever bullet to 2800fps, the 70gr case will push the same bullet roughly 118fps faster.
This actually plays out very nicely ... just look in your reloading manuals and you can do all of this comparisons based on the printed data. It plays out very nicely until you get into the powder burn rates slower then H4831, then it takes more fuel to gain more speed. This can be eased by going to barrel lengths beyond 26" but that is not always practical. Please note this is physical barrel length NOT effective bore length.
Overbore magnums in smaller cals in "shorter" barrels offer the worst gain in velocity per increase in case volume. That is where the whole "efficient" case thingy got started around the short fat magnums.
On the flip side, bore wear is exponentially related to volume of powder burnt if pressure is kept constant.
Speed is expensive... but hey, they make barrels every day and sometimes you just want to go fast..... let's hope the combo will also prove accurate.
Jerry
Jerry is correct, as usual. There is no magic case, or shoulder angle, or throating, etc, etc, etc. Case capacity and barrel length are 99% of the game in the search for velocity. Keep pressures the same, bigger cases go faster. - dan
The big things about the 7-300 is it rivals the STW with easy to get brass while still being able to house heavy VLD bullets in a 3.600" mag box and seated to land length. Its a pretty good blend of characteristics to have at the same time. The Rem Mag has the mag fit potential, but can't keep up. The STW can beat it in speed but will require a extended mag box if you want the VLDs and a repeater at the same time. There's also a scramble for brass. The 28 Nosler can be set up for a VLD repeater that touches lands in a 3.600", but they don't make it that way. Nosler stuck it in 3.400 box and pretended it was a Weatherby throat-wise. Brass availibilty is still touch and go, and if you can find it plan for 4 bucks a case. Luckily you won't need many for any of them.
