7mm round help...

[ducks-and-bucks]

Ive been doing some research and ive pretty much came to the conclusion that a standard .284 win would probably be the most accuracy inherent round for 1300 yards and under running a 180 berger bullet.... just looking to build some kind of 7mm for long range steel and paper that will double as a hunting rifle when needed....

The other two rounds were a 7 saum and 7 wsm.... but I guess the .284 will have less recoil... I had a 270wsm I got rid of.. it was the kickingest sob ever.... so another wsm doesnt thrill me..

Any other 7mms yall would reccommend to give serious thought into

 

[338 Mollett]

That is a great dual purpose round. Shooting out to 1300 is a crap shoot with cartridges that far out perform a straight 284. A shooter has to know within 50 yds at that distance just to make a general hit let alone a precision strike . Tactically that involves either a military range finder or darn close on a man sized target. I shoot up to 1500 and one day to the next can change 2 min.

 

[SEB-USA]

When you are talking LR paper, do you mean a specific comp?
If you don't have a comp in mind, or don't plan on competing, I would get a good solid bottomed muzzle brake.
This will make a world of difference in terms of felt recoil.

Ive been doing some research and ive pretty much came to the conclusion that a standard .284 win would probably be the most accuracy inherent round for 1300 yards and under running a 180 berger bullet.... just looking to build some kind of 7mm for long range steel and paper that will double as a hunting rifle when needed....

The other two rounds were a 7 saum and 7 wsm.... but I guess the .284 will have less recoil... I had a 270wsm I got rid of.. it was the kickingest sob ever.... so another wsm doesnt thrill me..

Any other 7mms yall would reccommend to give serious thought into

 

[Joe Wade]

If recoil is one of your considerations, why not a 7mm-08 shooting 162gr A-max or 168gr Berger bullets.
My 7mm-08 with 28" barrel shoots the 162gr A-max at 2800 fps. Stays super sonic past 1,100 yards.
Wind drift for 10mph at 1,200yards is only .2mils more than a 180gr Hybrid. 7mm 162gr bullet at 2,800fps will take an Elk or Moose with ease.
The kicker is, if you want it in a repeater, need a long action if shooting the VLD's and custom chamber with long throat to get the bullet base forward of the neck/shoulder donut.
My ammo has 3.025" over all length. The 7mm-08 is a good way to go if you don't mind a custom chamber build. For what it is worth, I realy enjoy shooting my 7mm-08.
Good luck on your build.

 

[Erik Cortina]

I would consider the 284 Shehane if you are shooting that far. It gives you 75-100 fps over the 284 Winchester.

 

[Steve Blair]

I would consider the 284 Shehane if you are shooting that far. It gives you 75-100 fps over the 284 Winchester.

[br]
+1 I've also found the .284 Shehane a little easier to tune than .284 Win.

 

[SEB-USA]

For a non-comp gun I wouldn't go to the trouble for a Shehane wildcat.
SAUM, WSM, LRH, or Dakota will all work and I would put a good brake on it.
Any of these cartridges will easily take you past 1200 yards. I have one of each of them ;D, but my barrels are a little shorter than yours will be

10 4. It wont be for any competition... just a fun longer range shooter thats hopefully fair danf accurate and can double as a deer rifle....


7mm08... I may be getting one anyways. Throwing a new barrel on a rifle soon to have for the lady to shoot...

 

[Steve Blair]

For a non-comp gun I wouldn't go to the trouble for a Shehane wildcat.

[br]
Ernie, [br]
The .284 Shehane is not a wildcat, it is an improved cartridge. Factory .284 Win cases are fired in a Shehane chamber to form the brass.

 

[SEB-USA]

Steve,
Agreed.
Bad choice of words on my part.

For a non-comp gun I wouldn't go to the trouble for a Shehane wildcat.

[br]
Ernie, [br]
The .284 Shehane is not a wildcat, it is an improved cartridge. Factory .284 Win cases are fired in a Shehane chamber to form the brass.

 

[DBailey]

For what you are after, I would not hesitate to use a 280 Remington.
It can achieve higher velocity with the great accuracy of a 284 win, and it maintains the excellent barrel life.
Recoil is about the same as the other non magnum 7mm's.

 

[pburr]

...and a 280AI if you want it a little faster!

 

[Heman]

I shoot a .280 Remington and can safely run 175gr SMKs at 2890fps in a 30" tube. 180Bergers run the same and I actually can push them faster since less bearing surface but the SMKs just shoot so nice and are cheaper.

 

[toddconley]

I have a 280 AI that I have shot past 1 mile with very reasonable results. Mine has a 8.7 twist 28 in Bartline barrel and sits in an Elisio tube Chasis. I shoot this gun in comps and like it because 5 round 300 win mag magizenes hold 6 and 10 rounders hold 12. I keep two 10 round mags and have 24 rounds capacity in 1 mag change. 162 amaxes will get to 1000 @ 6.6 mils @ 750 ft. Big 7mm bullets are easy to shoot as they have really good bcs until you get to really big 30 cals and of course 338s. 189 grain Caturusio Customs are the best bullet I have ever shot but I quit loading them because they don't kill deer well at all. Also Nosler brass is good and easy to get.
My two cents,
T

 

[steve-o]

I have a custom built 7mm Rem mag on a 700 action with broughton 5 c barrel in 9 twist 28 inch long.
at standard temp and pressure (70 degrees and 30 inches of mercury) my accuracy load is right at 3000 fps muzzle velocity. you can go to jbm to verify the numbers, but here it is...
it is still super sonic past 1500 meters, or around 1700 yards on 162 A-max or 168 bergers, they are both close.
the only other 7 mm to outperform it would be the 7mm ultra mag, you could gain about 200 yards.
this is 338 lapua ranges but a little more than 1/2 the energy, it actually out fly's the 338 lapua.
7mm mag bullet drop in moa is 28.5 moa at 1000 meters, 1500 meters is 60.8 moa. wind, for 10 mph full wind at 1000 meters is 6.6 moa, 11.7 at 1500 meters.
at 1500 meters it has 451 ftlbs of energy.
338 lapua 300 gr smk is 34.5 moa at 1000 meters, 71.7 moa at 1500 meters, 6.9 moa at 1000 for 10 mph wind, 12 moa at 1500 meters, and at 1500 meters it has 785 ftlbs of energy.

 

[338 Mollett]

I don't know where these numbers are coming from 338 lapua and like wise case capacity cartridges like mine can push a 300 g pill to 2800 fps. This translates to 25 or 26 moa drop from 100 to 1000 yds and that's sierra at a .765 ish bc not a berger at .820 . And if you want to get really silly shoot some of the GS lathe turned bullets and find out what bc really is. The military and few others have conducted more experiments than I have on the .338's .

 

[steve-o]

look at a 7mm SAUM, no belt, more efficient than the wsm or belted big brother.

the 338 data is at sea level, pressure at 30 inches of mercury and 70 degrees, if you are higher elevation, warmer, less pressure and hand load you will be able to beat that

 

[cliffe]

Steve o , I agree a 284 or 7 rsaum would be the way to go. but comparing 338 sierra and 168 berger and coming up with less wind drift for the 7 is a stretch. maybe compare berger 300 .338 to the berger .284 168 and 180 and I think the 7 comes up short in wind drift, what say you. cliffe

 

[flatlander]

When it comes to making a choice between a 284 Win or 280 AI, there are factors in each ctdg's favor. First off, a 284 feeds very reliably from AI 300WM magazines in B-O M5 DBM, w/o having to do any tweeking to the mag's feed lips. I've not had much success getting my 280 AI to feed reliably through these mags - even after tweeking the feed lips. I hate to screw up $88 magazines that work perfectly with the 284, so for now, I'm waiting on Accurate Mags to come out with a new magazine for the 30-'06 family of ctdgs.

WW284 brass is scarcer than hen's teeth right now, so you'd have to spring for the more expensive 6.5x284 Lapua and neck it up. R-P 280 brass is also hard to come by, but you can still find Nosler 280 or 280 AI. Personally, I think the 280 brass's primer pockets may last longer than a 284's when run with loads developing the same pressures. Seems to me that the 284's rebated rim design promotes loose primer pockets, but I have no scientific proof to back up that opinion.

My 280 AI is built around a trued Rem LA700 with a 30"Krieger 5R hvy Palma 1-9tw, and though I don't have nearly as many rounds through it as I do through the 284s yet, it appears to have accuracy about on par with the 284, which is excellent. The 280 AI will probably have a slight velocity advantage, but it should, since its case capacity is nearly 6grs greater.

So if mag feed is of no great concern to you, the 280 or AI may have an advantage due to brass availability. And if Accurate Mag ever does make good on their promise to make AI-style mags suitable for the '06 family, the magazine fed issue will go away.

I've shot several 1000yd any/any LR HP matches with a couple of my 284s, and while recoil w/o a brake (not allowed in the NRA's HP rules) gets a little tiresome after 75rds, it's still tolerable. My rifles each weigh 15.25lbs, and with a heavy shooting coat & sling, I'm still able to focus on a clean trigger break at the end of the day, although it takes more concentration than when shooting something like a 6 Dasher. That's just my personal limitations kicking in - another shooter might not have any problem with the 284's recoil. I've got Harrell's tactical brakes on both 284 & 280 AI bbls that I'm shooting now, and they make a lot of difference, especially when shooting off a bench. They're both fine cartridges for your stated purpose - it'd be a hard choice for me if I were starting over, having experience with both.

 

[steve-o]

I ran the ballistics off factory ammo on 338L 300 grain scenar with advertised mv and jbm ballistics data showed the 7 flew better just didn't stay super sonic as far. I'm sure if you hand loaded the 338 L you might get a little more performance.
now if I was shooting an elk at 1500 yards yes I would go with the 338L but only because of the energy to kill it. but I'm not gonna risk that elk taking a step or two while the bullet is in flight and wounding it.

 

[Romulus]

Didn't read all the opinions, but I can suggest the .284 for a fun round out to 3/4 mile. My straight .284 Win with a 30" bbl reaches to 1320 very comfortably just for fun's sake, a mile is fun too and your results won't be so mushy like at 1900 yds.

The .284 also doubles very, very well for a hunting gun - it's my mule deer and elk gun although I have a beast of a tack driving .300 Win Mag. I have complete confidence through practice out to all practical and ethical hunting ranges without any added recoil or overbore - not that this can't be done with the other cartridges listed.

I will probably Shehane next time though. ;D

I had to buy a better rangefinder because going past 1200 yds was much easier and enjoyable with the friendly shooting .284 than some of the boomers I've had.