7mm-300wsm

[acssa]

In 2 weeks time my reamer will be done so I can start working on building a 7-300 wsm.

I cant manage to find dies... so is it going to be custom dies or can anyone guide me please?

I know some use a 270 WSM bushing neck die.... what is used to full size and seat?

 

[Yagingaboy]

I purchased my 7X300wsm dies directly from Redding. I called them and asked if they could make me a die and the person said that they had them in stock and I purchased it directly from him. Worth a phone call to them.

 

[whatwind?]

Just use a 300wsm die with correct bushing

 

[Lbart]

For the last 5 years I have used a Redding 270 WSM 'S' Die with the correct 284 bushing for FL sizing and a Redding Micrometer 7 WSM seating die. it has worked quite well for me. If Redding now has 7x300 WSM dies that would be better.

 

[XTR]

When loading a 7-300 or a 7-270 does it make any difference whether you have a 270WSM or a 300WSM bushing die? I thought both the 7-300 and the 7-270 were pretty much the same bullet with different names, just a matter of necking down or expanding to get to the desired neck diameter. (I'm ready to be told I am incorrect if I am mistaken)

 

[Scott Harris]

When loading a 7-300 or a 7-270 does it make any difference whether you have a 270WSM or a 300WSM bushing die? I thought both the 7-300 and the 7-270 were pretty much the same bullet with different names, just a matter of necking down or expanding to get to the desired neck diameter. (I'm ready to be told I am incorrect if I am mistaken)

My understanding is the 270WSM and 300 WSM have the exact same body dimensions. But a 270 WSM bushing die "might" have a neck opening that sizes the 7mm case neck down before it even hits the bushing. Use a pin gauge on the 270 WSM die to figure this out....or just get a 300 WSM die and dont' worry about it.

 

[bobinpa]

I apologize for high jacking this thread, but what is the advantage of necking a 300 WSM down to a 7 when there is already a 7WSM? Also, according to the Hornady manual, the 7 WSM case is bigger.....I'm interested to know.
Thanks

 

[Steve Blair]

I apologize for high jacking this thread, but what is the advantage of necking a 300 WSM down to a 7 when there is already a 7WSM? Also, according to the Hornady manual, the 7 WSM case is bigger.....I'm interested to know.
Thanks

[br]
Bob, some shooters, primarily competitors, think 7 WSM has too much powder capacity. The 7-270 or 7-300 WSM offer a little less overbore problem but are still fairly high-powered cartridges. Most F-Class long range shooters are using either .284 Win or .284 Shehane. Both offer more a favorable balance between capacity and performance.

 

[bobinpa]

I apologize for high jacking this thread, but what is the advantage of necking a 300 WSM down to a 7 when there is already a 7WSM? Also, according to the Hornady manual, the 7 WSM case is bigger.....I'm interested to know.
Thanks

[br]
Bob, some shooters, primarily competitors, think 7 WSM has too much powder capacity. The 7-270 or 7-300 WSM offer a little less overbore problem but are still fairly high-powered cartridges. Most F-Class long range shooters are using either .284 Win or .284 Shehane. Both offer more a favorable balance between capacity and performance.

Thank you. I never looked at it that way. I have 2 300 WSM's and never realized the 7 had more capacity.
I wonder if there would be any benefit to necking the 7 up to 30. It may get the heavier bullets moving a little faster and help at longer ranges.

 

[whatwind?]

Shehane is 58 gr and 2875fps
7-300wsm is 62 gr and 3050 fps

Barrel life is 1400 vs 2000 rounds?

 

[Steve Blair]

Shehane is 58 gr and 2875fps
7-300wsm is 62 gr and 3050 fps

Barrel life is 1400 vs 2000 rounds?

[br]
I see ~2940 from 32" barrels with 180 Hybrids in my Shehane and they last about 1700-1800 rounds. The only F-Class shooter I know who uses 7-270/300 is Larry Bartholome. Maybe he will contribute his typical velocity and barrel life. [br]
My .300 WSM, shooting 230 Hybrids at ~2865 gives ~1500 rounds. F-Class is hard on barrels.

 

[XTR]

[br]
F-Class is hard on barrels.

Even with a 308 this is true, we F-TR shooters wear the lowly 308s out way faster than other shooters, though granted, it's 2x or 3x longer than the average F-Open barrel.

Whether it is a 7BBMF or a 308 pretty much all F class shooters load to the top of the capability of the cartridge. I don't think it is going to be an accurate representation to try to gauge barrel life from an F class gun, esp. an open gun, really can't be done from a single barrel. If you get on the line with that 7 with a good puller and a lollypop condition and run then a couple of weekends and I'm pretty sure you are shortening the life way more than another barrel that you shoot that doesn't get that treatment, but it is unlikely anyone will ever account for that. Thus the stories of the barrel that lasted almost 2000 rounds and the one in the same caliber that went to pot after 900.

Guys that have shot out half a dozen or more barrels should be able to give you a good range.

 

[Lbart]

Steve,
John Brewer and Bob Bock also shot a 7/270 WSM up to about a year ago. They had pretty good luck also. And yes FC is hard on barrels.

XTR,
What you wrote shows some very good insight to FC and barrels. I won’t shoot a 7/270 WSM in a match with more than 900 rounds on it. They may still be good but I got burned bad one day and lost my place on a US Team. Fortunately I got lucky and got back on. Barrel was shooting well that day and then the last 40 rounds just would not hold the 10 ring. Had a little over 900 rounds at the end. I was going to retire it at 1k rds but didn't make it. Since I only shoot 2 or 3 major multi-day matches a year I am not going to waste my time and money with an older barrel any more.

I saw the same thing happen in 2003 at the SoA with a 6.5-284 with 1500 rds. Would hold the old 20” ten ring but not the 10” X ring. That time I won with an 1800-139x but the 2nd & 3rd place guys dropped 2 & 3 points, but had 148 & 158x’s. I think I’ll remember my lesson now after the 2012 reinforcement.

Speed (velocity and fire rate) kills barrels.