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Which BIG 7mm?

 
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  #8  
Old 01-26-2009, 12:25 AM
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Re: Which BIG 7mm?

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Originally Posted by Topshot View Post
I am looking down the track at building a BIG 7mm Magnum rifle and would like your opinion of which one of the big ones is the best all round cartridge.
7mm RUM, 7mm STW, 7mm AM etc, etc.

Some of the considerations I am thinking of are Accuracy, velocity, reloadability, cost and availability of quality brass.

All opinions welcome.
I've had a 7mm AM for a while now and have taken several animals with it and consider it the best "big" 7 there is. It shots anything I feed it, from 200 grains down to 160 grains great and the long range, down range, performance makes it a ball to shoot.

Accuracy is outstanding, velocity can't be beat, reloads very easily and the Lapua brass can't be beat. What more could you ask for.
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Old 01-26-2009, 01:12 AM
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Re: Which BIG 7mm?

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Quote:
Originally Posted by ss7mm View Post
I've had a 7mm AM for a while now and have taken several animals with it and consider it the best "big" 7 there is. It shots anything I feed it, from 200 grains down to 160 grains great and the long range, down range, performance makes it a ball to shoot.

Accuracy is outstanding, velocity can't be beat, reloads very easily and the Lapua brass can't be beat. What more could you ask for.
That sounds like a dandy round, do you mind sharing the kind of performance you're getting with it and how much powder you're using and what kind of barrel life one should expect?
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  #10  
Old 01-26-2009, 01:56 AM
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Re: Which BIG 7mm?

I have a 32" Rock barrel and have pushed the 200 grain Wildcats at up to 3400 fps although the best accuracy is around the 3200 fps mark.

Several deer and one elk have all been one shot bang flops. I'm using WC872 powder and the loads range, depending on bullet weight from around 96 grains up to about 102-104 grains. I know others that have a different lot of WC872 use slightly different loads. It seems like no matter what I feed it the accuracy and performance is great from the 200 grain WCs down to 160 gr. Accubonds.

Accuracy and performance make vital zone sized rocks easy targets out to and beyond 1000 yards. I'd guess, and Kirby probably would agree, that hunting accuracy should hopefully last to about the 1000+ round count. I know of a 270 AM with almost that and the last I heard it was still going strong.

994 Oh Bleep Moment video by ss7mm - Photobucket

Two shots at 994 yards on rock in video above.
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  #11  
Old 01-26-2009, 02:52 AM
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Re: Which BIG 7mm?

The 7mm AM, is that the .338 Lapua necked down ti 7mm?

If so dose it keep the original shoulder angle?
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Old 01-26-2009, 02:14 PM
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Re: Which BIG 7mm?

It is based on the 339 Lapua case but the body taper, shoulder angle and location are all modified.
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Old 01-26-2009, 06:54 PM
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Re: Which BIG 7mm?

I would also like to add to what SS7mm has already mentioned. If your concerned about fireforming brass for the 7mm Allen Magnum, don't me. You can get formed brass from me that is ready to load and shoot with accurate high pressure loadings which will save on time and especially with your barrel life. Making it no different to load for then any factory chambering.

I do charge a forming charge and cases are formed to custom order, not in stock ready to roll but generally does not take to long to get them headed your way. YOu can supply brass or I can supply everything.

The 7mm AM may not be the best choice for what your looking to do, but it may be. All depends on what your goal for the rifle is? If you will be hunting out to 600 yards but no more, the 7mm AM is really not needed, it will certainly work and work great but there are smaller 7mms that will also work and offer a bit better barrel life.

If you want +1/2 mile reach and especially if you want 1K reach, it would be hard to beat.

At the moment, the 200 gr ULD RBBTs are not available for sale but when new owners crank up Wildcat Bullets again, they will be available so they are not gone forever.

The 180 gr Berger can be loaded to very good performance. They tend to not like to be loaded much over 3250 fps which is a very comfortable load in the 7mm AM. In fact, 3400 fps with this bullet weight in a 27-28" barrel would be easy to reach, bullets just will not take it so we have to limit velocity to some degree.

in the 7mm RUM, you will see 3100 fps or so with the 180 gr with similiar pressures that the 7mm AM will get you +3200 fps with the same bullet.

Really comes down to what goals you have for this rifle and until that is well defined, its hard to recommend any chambering. Anything from the 7mm-08 up to the 7mm AM will work in many different applications so we just need to know what your goals are.
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  #14  
Old 01-26-2009, 07:50 PM
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Re: Which BIG 7mm?

I can't say enough good about the 7mm AM, after my third season with it all I can say is, incredible!! and I've never shot the 200's (well maybe a couple) I shoot the 160 accubond at 3575 fps in front of 110 gr of WC872, it clocks 3575 fps.
If anyone is curious the case capacity of H2o for the 7mm AM is right at 122 gr. a pic of the last deer I took with mine

RR
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