Home Forums Hunting & Shooting Gunsmithing 7400 rebore

Would the gas ports be the correct diameter if a 270 were to be re-bored to .358?

To each his own, but I wouldn't waste my time or money with reboring any 7400. I know JES does rebores to 358, but not sure whether he'll touch a 7400.

Wouldn't the barrel need to be set back also since the 270 is longer than the 358? And can the barrel be set back on a 7400 the way the barrel attaches to the receiver?

It would be a 358 - 270. Similar to the Whelen.

740's were POS's!!!!!!

742's had hanger issues and unless carefully held were inaccurate.

7400's had decent hangers that kept the barrel close to free floating and were accurate. I think that the issues with the earlier models were taken care of.

I've owned 742's and in general have been happy with them except chasing brass. Admittedly the 7400 still has that flaw.

I've owned several 7600's and was quite surprised at the accuracy.

I had/have an opportunity to buy a very nice 7400 in 270. I'd rather have a large caliber semi-auto than a .27.

As soon as a 740 starts failing, use the stock for fire wood. Throw the rest away. There's no rebuilding them.

A few years ago I asked Norm Johnson to rebore a 338 WM BAR to 411/338. He checked it out and advised that as the gas port block was dove tailed into the bbl, the bbl would be too thin to be safe.

That's probably something to be checked in any semi-auto rebore.

Suggest you just ditch the Remington and buy an R-1.
Top Quality, accurate and no hiccups.

Buy a 300 WM or 338 WM as the small calibers are no lighter and the gas operation and great pad tame them right down.

my 300 WM, Nightforce 2.5-10x32 Ill. in SK mounts.

That rifle is very nice and I agree that rifle may be the best of the commercial semi-autos (not including the Special Made M1A's with two recoil lugs and glass bedding). But the M1A's are limited to 308 class of cartridges. I like the 300 WM and the 338 WM cartridges - I have several 338's and one 300. I'd like to try the 7400 though, just because... (Browning BAR's are good rifles too.)

Remington got a bad rap on the 740 and it was a piss poor design! The 742 was much improved, but it still had odd barrel harmonics and pressures on the barrel. A shooter could still get fairly good accuracy if that shooter would set the magazine on the sand bags or if the shooter could hold the rifle the same each time while resting their arm on bags. The 7400 was a much improved design as was the 7600 over the 760 design. The main improvement was the free floating barrel on the 7600. Of course the 7400 still has the gas port connection. But I believe that the 7400 probably is very accurate too and I'd like to see. I have not bought the 7400 yet and I'd only have it re-bored if: 1. it was accurate as is,
2. the gas ports were the correct size,
3. if the barrel was correct for the re-bore

I won't buy the rifle if either 2 or 3 are not right.

The 7600 270 I had shot about 1/2 MOA at 100 yards with the first load I tried. My immediate thought was a slide action should not shoot that well. I gave my son the pick of a few rifles (including a 700 270) and he grabbed the 7600. I still have a 7600 in '06. I've sold my 742's.

The bad rap Remington had over their 740 design was well deserved. It was less than junk, not even a good boat anchor. It will be a while before people forget that POS.

I believe that the R1 will likely last longer than the 7400 and may be better in ever way, I'm not sure. The "last longer" thought is based on a report of a guy wanting to compete his Remington against M1A's and the Remington did not stand up like a M1A. I'm not sure which Remington he was using. The 7400 will easily shoot circles around a stock M1A for accuracy though, at least that is my belief.

I agree an M-1A is a good battle rifle, but as a sporting rifle it's a club. (I own its daddy) N.M M-1



The R-1 is made by a shotgun builder and handles like a fine sporting shotgun.

The Remington is not a bad rifle, just nowhere near as good as the R-1.

I think you should call JES since they've probably done more than a few. Curious, why a "358 - 270" and not a standard Whelen chamber?

That's a Benneli?

tmitch: the 270's neck is longer, so to clean up the chamber, the 35 neck reamer would have to be run in farther.

bugger: yes it is a Benelli (2 ls), works too,

Because of the presumed difficulty in setting the barrel back.

Perhaps the best cartridge to change it to would be a 375 Scovil