Home Forums Hunting & Shooting Hunting Rifles Another 7mm Mashburn Super question

I would like to see someone chronograph loads in the same barrel in a long throated 7RM, then the Mashburn and maybe the STW. Put a strain gauge on it and see what happens.

Maybe a bad idea might take the magic out of it. Sort of like reading Capstick's book on Pondoro Taylor it ruined everything.

In Nosler's reloading guide they list 5 loads that shoot 160 grain bullets at 3,100 mv from a 24" barrel from a 7mm WBY.

Two of those loads nearly reaching 3,200.

Nosler also says 140 accubonds will run 3300 with a 7RM. I don't shoot noslers but i'm guessing those are generous velocities given my recent testing.

I should stop reading this thread, I reallly want a hotter 7 and Bob is a good friggen salesman.

I wanted a 7mm Mag and thought hard about the Mashburn because of the negative press about pressure problems with the Remington Mag, but ended up with a good deal on a 7mm Weatherby instead. It gets very close to some of the numbers quoted by Bob for the Mashburn. Federal factory loads with 160 Trophy Bonded Tipped are cruising at a little over 3200 and shoot into 3/4". That load may be hard to top with handloading or even wildcatting.

Bullet seating dies are pretty generic. The length of stroke in your press would beg the bigger question.

Doesn't this: $175
And this: 175 bucks

....mean the same thing?

Sorry, couldn't resist.

Came to the same conclusion. I stepped up to the 300 WSM and gave up all the twitterpatin' over the .284 minutia of this-is-better-than-that. I did retain my 280's in their original form.

I could not get my 160's to go above 3187 fps no matter what I tried in all three of my 7 Wby's. I wanted 3200+ with handloads. Couldn't get there.

Now I shoot a 300 WSM with 150 AB's cruising at 3285 fps average and not straining anything. I like it much gooder.

Reloader I consistantly get 3269 fps. over a Shooting Chrony using 76 gr. RL-25 and a 162 gr. Hornady from a 24" barrel out of my Mashburn. My case capacity is 90 gr. water or about 4 gr. over the 7 Weatherby. I only shoot 160 gr. +/- out of this gun and accuracy is consistantly .6" +/-. I am building another on a Rem 700 and will set it up for 175's; Sierra or Nosler. I intend to use Retumbo or H1000 if the gun will shoot that powder well and be done with it.

At 3269 I can reload the brass about 8-10 times before it work hardens in the neck to where I need to anneal it and instead I chunk it.

To me the Mashburh is effective, reasonably barreled (24"), light 8 lbs. +/-, and plenty powerful. What is not to like?

Warren Page was right. I bow to his superior wisdom.

Let me get this straight.
You're disappointed when you can't reach 3200 with a heavy for caliber bullet in the 7 Wby but you're perfectly thrilled with a light for caliber bullet reaching 3285 even with the radically lower SD and BC of the 150gr.
Bet you can't push a 180gr 30 caliber bullet to 3200 with the 300WSM. And you still don't have the SD of the 160 7mm.
Did you consider a 140gr bullet in your 7 Wby?

Anybody got a pic of a 7mm mashburn super?

Here's a link to a visual comparison of the Mashburn to the 7 RM, and the 7 Wby.

7mm Mashburn comparo

Don't know how to post it directly here hence the link.

The search feature (and BobinNH) is your friend.

http://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/4460772/3

thanks guys

I briefly ran 140's, even took an elk with one, but I much prefer 150's in the 7mm & 308 calibers. My longest ever witnessed kill was 389 yards on a running pig. That shot was with a box stock 280 Rem with 150 CoreLokt commercial ammo. I am not interested in flight path characteristics as concerns sd's or bc's when it comes to hunting bullets. I just wanna hunt and am perfectly happy doing so with my current load in the 300 WSM. I have no concerns at all that it will take me out to 500 yards should I desire to do so.

My current self imposed distance of engagement is no more than 300 yds until I get a good turret scope.

So, do you 7 MSM proponents think it'll fit in my 7 Wby Mk V action?

Of course it will.

Talking to Snowflake, another 7mm MSM user, and he pointed me toward an article on the 7mm Practical, which is essentially the same thing. So help me interpret what I'm reading here...
http://www.ballisticstudies.com/Resources/Articles/The+7mm+Practical.++A+Practical+Magnum..html

If I'm reading this right, he formed the cases using a generic Hornady 7mm neck sizer with a 30 degree shoulder.
Then he used a 7mm Rem Mag seating die.
This is what I've been trying to figure out if I could do in order to make my rifle operational this year, not this coming winter.

Tell me if I'm way off base here thinking I could pull something like this off.

And continuing this train of thought, guess which commercial 7mms have a 30 degree neck?





The RUM and RSAUM!

So, dare I go ahead and put my reamer to work now that I won't be crippled by $300 worth of form and sizing dies plus a 4 month lag?

257 can't recall if I ever posted one....Mmmm.....did Dober?