284 vs 7mmWsm?

K

KevinU

Sergeant
Full Member
Minuteman
Jun 14, 2009
482
54
Colorado
#1
Going to start collecting parts for another build.

Currently shooting a 6.5CM. Shooting the CM in steel Prairie dog shoots out to 425yds. Got bitten by the competition bug. Plan on shooting in steel shoots out to 875yds. Would like to go to a heavier bullet for the challenging winds at the 875yd site. Would also like to shoot the 7mm at the PD shoot sometimes. The PD shoot is limited to a 175 grain bullet max. Probably the 162amax, 168vld or 175smk for the PD shoot. 180vld or 175smk for 875yds.

Looking at a 7mmWsm or a 284. Barrel life??? Other 7mm calibers to consider?

Thanks
 
#3
Re: 284 vs 7mmWsm?

7WSM: more powder, more velocity, more barrel wear
284: less powder, less velocity, less barrel wear

I think 1000-1200 for the WSM and 1750-2000 for the 284, but all depens on what you expect and luck of the draw on the barrel. I have a 6.5-284 that is on 2400 and still grouping tight, the other went out after 1600. Same brand, time of build etc...
 
#5
Re: 284 vs 7mmWsm?

Not seeing any advantage here except burning more powder and less barrel life
162Amax and 6.5 cal 140berger VLD have pert near same bc, learn to shoot your CM in the wind and save your $$
 
#6
Re: 284 vs 7mmWsm?

honestly the 6.5cm is fine for your distance, easiest thing you can do is print out drop charts for the 2 based on your proposed velocities with your choice of bullet and see if the difference is really worth it. i would bet not, i owned a 284 and really liked it but ballistically it wasn't that much better than my 6x47 with 115 dtacs so i stuck with the 6mm.
 
#7
Re: 284 vs 7mmWsm?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Flying Dutchman</div><div class="ubbcode-body">

I think 1000-1200 for the WSM and 1750-2000 for the 284,</div></div>

i push 175 smks at about 2850 out of my 284 and am at 2600 rounds now. i will shoot 100 more this weekend at the final match of the year. after that, i will screw on my new barrel to start fresh for '11. most of the guys i shoot with using the same load are getting 2600-2800 rounds of barrel life.
 
#8
Re: 284 vs 7mmWsm?

I got 3300 rounds out of my last 7WSM Broughton barrel. Getting to 3K rounds is not unheard of either. There have been several people on the Hide that have gotten around there.
 
#9
Re: 284 vs 7mmWsm?

I shoot the f-class 1000yd matches with the 260, 140VLD, 2815fps and do ok for a beginner. It is not the bullet but as one of the guys said........I just need to learn to read the wind better.
 
#10
Re: 284 vs 7mmWsm?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KevinU</div><div class="ubbcode-body">Would like to go to a heavier bullet for the challenging winds at the 875yd site. </div></div>

Wind is a killer isn't it...

But...A heavier bullet will not necessarily gain advantage in the wind. What you are really looking for is higher BC and/or velocity. A higher BC usually comes with more weight, but there is a trade off if velocity is lost in going that direction...so you might take a harder look at 6.5 ballistics and review your bullet choices to see if any improvement is available there.

The 7mm bore is certainly a great contender here. If this was to be a hunting rifle, I would lean toward the 7WSM over the others, but for this the straight 284 would be a good choice as well. Lighter recoil, better barrel life, and it's hard to beat the 162 A-Max BC without a lot more effort...take your pick, they are both excellent.

TC
 
#11
Re: 284 vs 7mmWsm?

It all depends what you are after.

I think the last FCWC made it clear that the 6.5-284 does not cut it against the 7WSM in the wind. But what are you after in the end?

NB: If you can read the wind, then a 308 is all you need really
wink.gif


The difference between 6.5-284 vs 284 is not so great, if any at all. What you gain in BC, you loose with speed. My 7WSM gives me 3100-3200fps with the 180VLD, so it has speed and BC. Yes, the barrel is shot out sooner. You can't have it both ways, as ever.

Also take in mind the recoil, the WSM is a bit harder than the 6.5-284. The 6.5 I can shoot free recoil from my rest, the 7WSM will take my eye out of I try that. No muzzle brakes in F-Class.
 
#12
Re: 284 vs 7mmWsm?

Regardless there is no magic bullet, you cant buy better scores via equipment only
You have to do your part so shoot more and learn the wind
I will quite happily shoot against any 7 anytime and in fact do as my match rifle is a 6.5x47
Remember its not the BOW but the INDIAN
 
#13
Re: 284 vs 7mmWsm?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Flying Dutchman</div><div class="ubbcode-body"> What you gain in BC, you loose with speed. My 7WSM gives me 3100-3200fps with the 180VLD, so it has speed and BC. Yes, the barrel is shot out sooner. </div></div>

3200 fps with a 180 vld? please tell me your secret!?
 
#15
Re: 284 vs 7mmWsm?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Flying Dutchman</div><div class="ubbcode-body">
The difference between 6.5-284 vs 284 is not so great, if any at all. What you gain in BC, you loose with speed.</div></div>

if the ballistics are a wash, what's teh barrel life comparison? i don't personally have any experience with the 6.5-284 but i bet it has a MUCH shorter barrel life than a straight 284.


<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Flying Dutchman</div><div class="ubbcode-body"> My 7WSM gives me 3100-3200fps with the 180VLD, so it has speed and BC. Yes, the barrel is shot out sooner. You can't have it both ways, as ever.
</div></div>

what is your load and barrel length? how long does your brass last? or is there maybe a conversion mistake between metric and standard?
 
#18
Re: 284 vs 7mmWsm?

With a straight .264, 140VLD I am pushing the envelope to get 2830fps (Winchester brass neck down 7-08) but the guys shooting .284 are getting 2900fps with a higher BC bullet so there is difinitely some positive to shooting the .284. Both the .264 and the .284 are getting fairly high round count but I have heard that the 7WSM and the 6.5x284 are burning the barrels pretty fast....like 1/3 of what you get from .264.
But back to what has already been said, why submit yourself to the beating of a mag load chasing scores with money when a little more practice and you can do it with a more comfortable shooting round.
 
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