Home Forums Hunting & Shooting Custom Rifles & Wildcats The 7mm Mizzum

Wow! Was this really 5 years ago?

Hammerdown I did get that buck in Wyoming...he grossed about 180. He was a nice one!

But I did not get him with the Mashburn.

Day before departure I went to the range and had a scope issue. Metering hours before departure,I grabbed a 270 that was zeroed.Shot the buck as he ran about 80 yards after a long stalk.

Did use the Mashburn back here on a buck at about 300 yards later that same year.I do expect to use the rifle this fall again.

As to the build if you are inclined, no need to get fancy. Sgt Beretz on here punched out a M70 and we walked him into a knot-hole load (factory barrel), in two afternoons. Dave 7mm built one with a Rem 700 and Chanlyn barrel and was done with his ladder test in one day.

It ain't hard.

Use WW brass.

Hi Bob,
That Chanlyn barrel is a sweethart.
No 3 conture is drilling stupid small groups at 400 yards with 168g Berger classic hunting bullets.I sent Bob the pictures...
My Mashburn is just a tool.Built the way I like.
M700 action
McMillian HTG in edge painted in desert digital camo.
Worked over M700 trigger.Safe locks the bolt down.
Feeds and functions like glass..
Even skipped the S&B and put a Zeiss Victory 2.5-10x50 to keep the weight off it.
The first season I ran Rel 25 and the 150g ballistic tip.
Deer ran aways more than I wanted.Dead deer running type of thing.
Last season switched to the 168g Berger.And H1000.
Dead deer.No problem.
I like H1000 alot.
Thanks for all your help Bob.


dave

How does RL33 work in this cartridge?

Hi Dave: You REALLY made it look easy.

After watching you work that cartridge out I felt like a dummy!

Bob have not tried it but my WAG is it would be great with 175-180's.

Bob,
I still have the buck picture

MM: Hilarious! Green check and all LOL!

He trotted across after a hot doe at about 300 yards. I kill ANY buck in NH, I call everybody!

Thanks!

The pic was bigger but image shack resized it for me

He was a great buck and, you look good in green.

Hello all

I've been out of town for a bit, I'm back now.

Bob and others, thanks for your input in this thread. I hear good things about the 7-MSM. It's a win-win. (if you like it).

Take care.

Who has 7mm WSM brass in stock for handloading?

I looked at two suppliers and one was out and the other said it was a "seasonal run".

What does WSM brass have to do with a Mashburn?

I like mine so far. Done everything I asked of it.

Worked as it was was supposed on the lil cow..



160 AB blew in and out the other side at 254 yards. She never took a step. Not a manly test of it, but it was cool to finally put all the shooting on something.

You always post and manage to go Full Retard. I'm curious what the process is like for you when you turn your computer on. Funny as [bleep], I bet.

Well Bob, how long before you begin tinkering with a 28 Nosler?

I think the 28 Nos must be pretty close to the 7 Mizzum.

Expensive brass, good quality, ready to go, no fire forming needed.

I don't have a 28, opinions are based on 26 Nos brass. Last year I built two 26's, one for me, one for a hunting bud.

DF

Nothing, obviously...

DF

Doesn't the new 28 Nosler have quite a bit more powder capacity than the Mashpotato ? Isn't the Mashburn just a 300 WM case ?

Reloader the 28 Nosler sounds like a great cartridge.

But I don't see one in my future. I am so vested in 7RM and 7mm Mashburn rifles, brass,dies etc. that whatever advantage it may offer will be lost on me.

I am up the whazoo in 300 Win Mag brass to form cases and the Mashburn Super has proved to be pretty simple to make and run that I have no real desire for anything else.I am very happy with the cartridge and my rifle.

It works pretty good!

It does.

I just checked the Nosler site.

28 Nosler with 175 gr. bullet, 90 gr. H20 case capacity
300 WM with 175/180 gr. bullet, 82.3 gr. "
300 Wby with the same bullet 91.8 gr. "

I remembered that the 6.5/300 Wby was pretty close to the 26 Nos, although the new Wby round is hotter. Slightly more case capacity plus Roy's magic freebore...

Using the .300 WM as a basis, the 28 Nos is a bigger round than the 7mm Mizzum.

Bob may be able to educate us on the exact case capacity of the Mashburn with 175 gr. bullet.

DF

DF I am certain the 28 Nosler holds more powder. I never measured case water capacity with a bullet seated but the case itself hold 90 gr of water to the top of the neck.There will be tiny differences based on brass internal construction, thickness, etc etc.

(Not that it matters a whole lot but it might be more accurate to say that the 300 Win Mag is nothing more than a 7mm Mashburn Super necked up,and with a shorter neck since (a) the Mashburn came first; and (b)both cartridges share a similar case length, the only two belted cases i know of with that case length.This has made me wonder where Winchester came up with that case length. Maybe some WW engineer saw a Mashburn.?..)

Neither here nor there but good to understand the timeline of how we got where we "were"....

Velocities are as interesting as case capacity and here's what I've seen from the Mashburn,and this includes my rifle and a few belonging to others. Barrels are 24" unless otherwise indicated:

My rifle: 175-73 gr H1000 for 3075.
160/162- 75.5 gr H1000 for 3200 (loads with Retumbo and RL25 boost this to 3250 without a sweat and good case life.

I have not fed mine any bullet lighter than 160 in full Mashburn loads, but my FF load (to make brass) with 139 Hornady -65 IMR4350- gives 3150-3190;about like a 280AI.

These velocities are about identical to the velocities obtained by my buddy,and by Scotty Beretz on here, from their rifles. The loads are so uniformly similar, rifle to rifle,that we could shoot each other's loads.

Dave 7mm uses the 150 BT at somewhere between 3250-3300 fps in his Mashburn Super. Dober uses the same load in his. Laker on here has one and shoots the 150 BT but don't recall his velocity and don't know what his loads are.

RCamuglia on here uses the new 195 gr Berger at (IIRC) 2965 with 72 gr H1000 from a 28" barrel,from his 7mm Mashburn Super. I know Rick has run his to over 1500 yards and is happy with it.

I'm in close contact with most all these guys,and they reported as they did load work up.

In any event these velocities are substantial enough that I am not going to worry about how much the 28 Nosler beats it. I'm also not paying much for brass since I'm using that common 300 Win Mag stuff.

Besides, doing all these cartridge comparisons gives a guy a headache. I'll just stick with what i got...