Home Forums Hunting & Shooting Long Range Hunting The Big 7's......Which One?

[/quote]Yes, Bob we have shot them in two Mashburns...they are very accurate.But I don't hunt with them.[/quote]

I'm thinking the Mashburn should push them to 3200 without much trouble, my thinking is long range Pronghorn, my favorite is the Partition but the AB should fly a little flatter and have a little less drift than the Partition.

Thanks!
Bob

Bob seems the top end is about 3250 with 160 AB's and Retumbo;over 3200 with RL25 and H1000.

We can see little difference we can detect with regard to pressures, etc., with the 160AB, Partition,or Bitterroot.IIRC my pal has also run some 160 gr Northforks....about the same/same across the board.

The cartridge is pretty predictable in terms of where we wind up velocity wise.

I have had only one screw up, that with a 160 AB and Retumbo that registered 3330...I got a bit heavy handed with the Retumbo.I never fired another round of that load.

If I could get 3200 out of a 24" barrel life would be good. I have a little Retumbo left after playing around with the 7mm Ultra but will need to restock anyway so it doesn't really matter what powder I use, I'm in the sticks so pretty well have to order it anyway.

I have run 162 gr. Honardy Interlock BTSP at 3250 and 76 gr. RL-25. Plenty fast for me.

I'm pretty sure that it was the 175 Noz that Dogzapper said was the bane of the guide's existence when he was guiding in Hell's Canyon. They didn't like the way that bullet worked out of a 7 RM.

Driven at 3200 fps though... whoa...

I like Steve a lot, but on this one our experiences are 110% diff. Now I've not used the new 175 Sptzr much but the older 175 Semi (BC .484 I think) is an absolute hammer and then some!!!

Dober

Bob, 3200 from a 160 and 24" barrel seems pretty routine. I am not surprised anymore with 3250, like Doc says.

This is the big reason I went to it;those velocities are consistent,easily acheived, with none of the melodrama we sometimes encounter with the 7RM where some rifles get good vels and others are stubborn.

Those interested can ask RinB on here about the 175 NPT in Africa....Darcy E as well.Ingwe seems happy also from the 7x57......As to other 175's I am generally getting very good reports on not only the NPT;but the TBBC as well.

Not to worry...certain there are plenty of great 175-180 gr 7mm bullets to suit anybody's flavor of bullet performance.

I bet those 175's would have some come-back-atcha from my Kimber at, what, 2900 fps or so <grin>...

this would be the big 7 I'd build.

http://www.longrangehunting.com/forums/f19/7mm-allen-mag-test-rifle-finished-12095/



This pic compares the 7mm Rem Mag, 7mm Allen Mag and 7mm RUM. The case capacity of the fireformed 7mm Allen Mag is 15 grains larger then the 7mm RUM in spite of only having a case length of 2.700"!! When both seat bullets to 3.650" the Allen Mag has an even larger capacity advantage.

stx: The Allen mag is a big kahuna all right!

Jeff I'm guessing that's about right....

Build it in a hunting weight gun (4 me at most 8 1/4 lb all up scope, rounds sling) and no break and get back to me about how the Allen works out...

Dober

Things like the RUM or the Allen... I think about the time got familiar "enough" with it, it'd be time for a new barrel.

Jeff you and Dober are nibbling around a key issue for me...this rifle weight/recoil balance thing.

Yes you can go up in powder capacity, likely beat it in velocity.But in a rifle of 7.5-8 pounds the Mashburn stays pleasant enough to shoot...not suggesting it does not recoil of course. It does, but the powder charges and bullet weights at Mashburn velocities are just below that threshold where it becomes "excessive".

My rifle weighs 7 pounds 14 ounces scoped. Not a fleaweight,but light enough to lug, even in mountains.Running the numbers it should kick more than it does;but that Echols stock makes it behave like a pussy cat at that weight, even with full house 175 gr loads.

That raises a good question for us newbs to the Mashburn... what stocks out there (factory or aftermarket) are suitable for setting up a well-balanced 24 inch barreled rifle while keeping the <= 8 lb Mashburn "pleasant enough" to carry and shoot with 175s? I am pretty sure that I will choose a used M700 7RM in some fashion to convert, and then let pain be my guide... but it is nice to know where I should be looking for aftermarket pads and stocks...
I have a bony shoulder... shooting a steel butted M14 with service 7.62 ammo is painful to me. To this day I don't own a .308 Winchester in anything.

My latest Mashburn is as outlined earlier. 1972 Rem. 700 barreled action, Brown 'pounder stock, Luppy 6x33 LR, Talley mounts, nylon sling, 3 rounds in mag. = 7.4 lbs. Calculated recoil 33 ft/lbs. with 175 gr. at 3100 fps. With this configuration the balance point is a little weight forward and it hangs very well.

I have shot this thing off the bench for 20 rds. and while snappy not abusive to me. Mobile, accurate, and deadly. YMMV.

My main Mash has a Brown on it as well, if I recall right the weight on it is 28 oz.

For me I like the weight out front so would want the stock to weigh no more than 28 at max.

Doc's Pownder rig sounds awesome!

Dober

Dober:

I built the latest Mashburn to be weight forward and lighter than my original one. The first one is in a Brown normal fiberglass stock with a Swarvo 2.5x10 Habitch, balances mid-action and weighs about 8.2 all up.

I'd do a Rem700 KS Mountain Rifle stock from McMillan.

Whats the parent case for the one in the middle? L
ooks like a shortened 338 Lapua maybe?