long range rounds

ajax said:
has anyone had any expearence with the 7mm, does it burn barrels more than say a 6.5x284?
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which cartridge?

The 7-08 is a pussycat. The 7STW is a barrel makers friend.

It all depends...

The 280AI has become popular enough to have factory brass made. Nosler has champion this rd in brass and rifles. Performance can be superb.

My 7 Mystic is a variant of this wildcat with a bit more case capacity and longer neck then the 7 Gibbs. Think 280AI with a neck location identical to the 7RM.

Jerry
 
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I'm still flinging 200 and 220 gr MK's out of my .308 and am able to get decent long range groups when things go right. This thing is cheap to shoot, I don't have to worry about barrel life, and trajectory when shooting paper doesn't matter much if you have the adjustment in your scope.
 
ajax,
Check out 6mmbr.com and click on the 7mm info on the lefthand menu bar. This is some excellent info from the worlds top shooters if you are considering the 7mm bullet for LR shooting. (and check out "guns of the week" to see mysticplayers 6.5 Mystic)
 
They are really very similar and their case volume is not that much different SO their wear and tear will also be similar.

Many will recommend the WSM because it doesn't have a belt to cause chambering issues. With most 7RM reamers out there, I would concur, however, I have had a few chambers cut with a wonderful reamer that is very tight around the belt. See Guntech for this.

Given the slightly bigger case volume of the 7RM and ready supply of components (both are not bad these days) AND the need to drive 180gr Bergers nice and fast, I would opt for the 7RM (with the good reamer) and its slightly larger case capacity.

It is so much easier to tune a rifle that can run at normal pressures. Many small cases perform their best when firewalled. These can be a pain to tune as weather and temp changes.

Just check with the smith and the reamers that will be used. That is more important then choosing between the WSM and 7RM.

Jerry
 
The advantage of the smaller chamberings is efficiency and barrel /throat life. The 284 (and Imp.versions) can come close to 7WSM velocities with 10- 15 grains less powder and a 30+ inch barrel. Yes 30+ inch barrels are a bit more expensive but they also provide a good platform for rechambering. Once the throat has worn out you can rechamber and still retain a long barrel.

I do agree with Mysticplayer about the brass etc... for the smaller cartidges. To run these little cases hot your brass life will probably be reduced from the WSM/RM at normal pressures, and you have to tune powder charges to accomodate tempertaure changes.
 
thanks diesel, and mystic, i have checked out 6mmbr.com and it is informative, but has anyone got a number of rounds threw their 7mm mag or 7mm wsm?
plus i thought the 7mm wsm has more capacity than the 7mm rem mag?
 
NOPE. All WSM are smaller in case capacity (not by much) then the standard magnum they are trying to mimic. Remember the whole "more effecient, less recoil" marketing?

Anyways, I have owned and shot several 7RM's at LR and can say it works great. My smallest group ever on paper at 1000m was with a 7RM, Re25, and 162gr Amax. This was before the 180gr BERGERS.

There are now so many slow burn powders that you can tune this case volume with ease. I think Re25, and Retumbo might just be the perfect powders for this cartridge.

Either 7mm will give you around 1000rds of accurate fire. There is no free lunch....

Jerry
 
(2) 6.5x284S F-Class shot out to 1760 with these both with (H 4350) and 142 smks
7m mag (RL 22) 162 A-max good 1000 yard shooter
6m BR (varget ) 107s smks have not shot it past 800
308 I use 175 SMKS in one with Varget (rem) Taken this one to 1250 Y
308 use 178 A-max with BLC2 (Tikka) Taken this one out to 1400 y
 
mysticplayer said:
There are now so many slow burn powders that you can tune this case volume with ease. I think Re25, and Retumbo might just be the perfect powders for this cartridge.
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Jeez, 25 and Retumbo seem awfully slow. Not saying you're wrong though. Berger lists some wicked slow powders for the 210 VLD in the 300 WM so maybe with these heavy bullets and long barrels (and long mags) you can go with slower powder. Might have to try to get some Retumbo off my neighbour to test. Damned shame, seeing as I just stocked up on the 4831s, 7828 and RL22.
 
BUM, many LR target shooters have found that near compression loads that are max allowable pressures yield the lowest amount of vertical dispersion and great consistency/accuracy.

TONS of IMR and H4831 has been burnt through 7RMs over the decades but there is lots of room in the case. This can lead to less then ideal ignition which can lead to less then ideal groups.

The 6.5X284 with H4350 seems to be a glaring exception to this rule but as we say....YMMV.

I have found Re25 to be the most accurate powder with 162gr Amax in several rifles. Great velocity too.

When you start burning H50BMG, H870 and USS869 and others once loaded in 20mm rds, you are using slow powder.

Jerry
 
BigUglyMan said:
Jeez, 25 and Retumbo seem awfully slow. Not saying you're wrong though. Berger lists some wicked slow powders for the 210 VLD in the 300 WM so maybe with these heavy bullets and long barrels (and long mags) you can go with slower powder. Might have to try to get some Retumbo off my neighbour to test. Damned shame, seeing as I just stocked up on the 4831s, 7828 and RL22.
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Just did a pile of new load development with my 300wm after re-barreling.

RL22 - very tight groups with loads just over max, lower velocities compared to other powders. (At least 200+ fps slower than H4831SC)

H4831SC - Very tight groups just over max with screaming velocities (thus I'm still working with this powder).

US869 - Groups were not to bad, I just played around with this powder as I had access to some while doing load developement. I was running test loads way over listed max with no pressure signs. However, with a 26" barrel, the flame out the end of my barrel was rediculous thus I'm not burning all that powder in the shorter barrel. For those running a longer barrel in a 300wm, you might want to play around with this powder with heavier bullets.

Above shooting 210 bergers / lapua brass / 215M primers.



I would imagine that with heavier rounds in the 7mm, you could run a much slower burning powder. Especially if you had a barrel long enough to allow complete burn of powder.

Enjoy playing with your stock pile of powder.
 
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