Home Forums Hunting & Shooting Custom Rifles & Wildcats 257 bob build

I've got to give my smith the specs on my 257 and thought I'd see if anyone has one close to these dimensions.

This is a model 7 for my daughter. I've got a nice swirly mcmillan in the standard M7 pattern with a 12.5 LOP on order.

Here's what I'm thinking on the barrel. One inch cylinder with a fast taper to 22 inches at 0.560 diameter. I may end up cutting back to 21 inches if the balance is off.

I'll top it off with a Leu 2.5X8 and hopefully have a light rifle with little recoil that she will shoot for years to come.

I have a custom bbl on a 700 long action (257R) throated for a 3" OAL. I'm glad I went that route as I get well over 3100fps with 100gr bullets using the extra powder room. A shorter action may cramp it up a bit.

IMHO ..... If I was using a Model Seven, I would go with a 250AI with a similar long throat for the many long bullets on the market today.

Just a thought.

I'd also do a 250AI, same/same velocity as the Roberts and a mo better fit in the seven..

I'd also run 21", modest shank and would probably go for a bit more meat at the muzzle. Seven's are to barrel light for me, even more in a M7 handle.

SeaRun,

Would you also be counting down the days to meeting the Sisters Gemini?

Funny, a guy with your tastes used to be seen round these parts now and again ...

Welcome to the fire!

GE

I'm better looking....

LMAO ... just don't post the pictures to prove it ...

Anybody looks good next to a blacktail piggy ...

Funny, I would expect hear that you are mo betta hung!

In the 7, knowing now what you now know, would you still go with the 250AI, or would you try the 25-284? 25-284 seems to make the most out of the available space, however the 250AI seems to appeal to me as enough for what I need.

250AI, like the 223AI it just seems to hit the right efficiency level for the caliber.

Planning the same project, a 250AI using a Remington 700 action currently chambered for 243. Like the 21 -22 " barrel idea.

Thinking 250 AI so that in a pinch 250 Savage ammo also can be used. The 25-284 is interesting but cases and dies may be a little more costly, me thinks.

Hello

I'm just putting my 257 Bob together, and have just gotten all the major parts together, action is a VZ-33 (practically the same as a G33-40) stock is a very slim plain lightweight NZ walnut, and the barrel a Lothar Walther CM in pattern 1500 "Bavarian Classic" http://www.lothar-walther.de/html/423.php . This profile has a 1.00" reinforce (the VZ-33 is small ring, so only needs a 0.980" shank), and finishes .630 at the muzzle. Mine will finish at 23 and 1/2".

It'll finish at just under 7 and 1/2 lbs complete with a M8 (or similar Euro) scope.

Cheers

fwiw & imho,
A .257 Roberts or .257 Roberts AI are intermediate cartridges best housed, imho, in intermediate actions. The only true intermediate with a properly designed magazine would be an appropriate Mauser. Which, from your post, is not the direction you want to go in... I know zip about the .250 AI, however, I'd tend to either build on a true short action cartridge or build on a true long, or standard, action cartridge...

Regards, Matt.

You could always just do it with a stock 250 chamber and give it the "AI" treatment down the road.

Prezactly my thoughts! SeaRun, could you help me with a 120TSX out of my 7-08????

Last I checked SAMMI Max OAL for the Bob was about 2.780 right? That is a short action cartridge.

The mag box on Doecamper's M7 7mm08 handles cartridges at 2.825.

A M7 Bob sounds just 'bout right. ESPECIALLY since you're putting a custom tube on it, you'll be able to dictate the freebore. Pick your bullet of choice at the desired seating depth that the mag box will allow and chamber accordingly.

The nice thing about the Bob as opposed to the 250AI is simplicity of dies and components.

One other thing to remember about the balance of your rig is that you are going with a short stock. While the M7's feel butt heavy with the standard barrel and stock, trimming the stock shifts the balance nicely forward.

Doecamper's rig has the 20" barrel on the old walnut handle. Balances perfectly with the lumber cut to 12 3/8 and a 1/2" ultralight decelerator. That package comes in at 7# 2oz empty with Talleys, Sightron 6x42, and a Butler Creek Sling.

GE

I've had 2 gunsmiths refuse to build me a .257 on the Seven action, one of them being Darrell Holland. They were both sure that it was too tight a squeeze and that, while possible, I would be unhappy with the results.

.250 AI is an option and gives performance real similar to the standard .257. .25-08 aka .25 Souper might feed a little better.

I like the 22" idea, but if I were doing it I'd either go with a #3 contour round barrel or #4 contour fluted barrel. Love your choice of scope!!

I have a barrel and action at my gunsmith for a .257 buildup. The gun began life as a 700 LVSF in .22-250. Somehow or other, it got pretty well shot out. :-) I ordered a Lilja .25 cal barrel with a 1-10" twist which externally matches the factory contour, length, fluting, etc. My gunsmith (Kevin Wyatt from Wyatt's Outdoors) makes an extended mag box and follower for the short 700 which he's installing along with the barrel installation so I can use a 2.9x inch OAL. If all goes well it should be ready by mid January. Woo hoo, crossin' fingers.

Tom

My Sako 75 in .257AI with it's detachable magazine length is the biggest issue I can't seat them out as far as I'd like. If I could do it all over again. I'd set the 110 Accubonds where I wanted them to fit the magazine and then have the chamber cut to fit accordingly.

another option woudl be to do a 6.5 x 47 Lapua It would fit with room to spare.

Michael

So says SAMMI, but there are quite a few longer bullets on the market that will take up valuable powder room in an already smallish case. A 3" Roberts makes alot more sense as it give about .250" more room than the outdated SAMMI spec.

I've used loads in mine that approach 3.100". I like having the long throat and 100gr loads that go over 3100fps.

If you plan on using the 115-120 grn bullets I'd get a barrel with a 1 in 9' twist.