Can you rechamber a .270 WSM to 6.8 by shortening the shank/chamber end and running a finish reamer?

[Wilderness Blacktail]

From what I understand a .270 WSM with 175 gr bullets will not fit in a short action's mag box or feed from it, while 6.8 Western with long bullets will fit and feed (isn't that the reason they developed the 6.8 in the first place?).

I originally asked because I've seen several M70 Classic rifles in .270 WSM that I've thought of picking up, but no point in rechambering a 1:10" barrel.

A Good way to get a visual reference is to look at a saami spec 260 remington with a 140gr n up bullet and then look at the 6.5 Creedmoor with the same bullet. They both fit and the bigger case can run it faster all else being equal.

The 6.8W and 6.5CM are shorter and so more ideally designed for that combination but it works in either. There are of course specific bullets that may not fit at a certain COL in one case, magazine or chamber but thats just the way things go.

The M70 win has a 3" magazine if im not mistaken. My 270WSM XPR has a 2.9sumthin mag if i recall. I can check.

 

[Wilderness Blacktail]

From what I understand a .270 WSM with 175 gr bullets will not fit in a short action's mag box or feed from it, while 6.8 Western with long bullets will fit and feed (isn't that the reason they developed the 6.8 in the first place?).

I originally asked because I've seen several M70 Classic rifles in .270 WSM that I've thought of picking up, but no point in rechambering a 1:10" barrel.

I think the real reason they developed it is they didnt wanna confuse people with two loadings of 270wsm. As in a 1:10, 2.8" combo and a long throated 1:8 twist
combo.
Aaand new cartridges are opportunity for new customers and many newer enthusiasts may not know that a longer ie 2.95" throated 270wsm with quick twist is still more capable than a smaller case with same throat/barrel specs, so the 6.8 seduces them with all its moderness.

 

[JAYgs8163]

I think the real reason they developed it is they didnt wanna confuse people with two loadings of 270wsm. As in a 1:10, 2.8" combo and a long throated 1:8 twist
combo.
Aaand new cartridges are opportunity for new customers and many newer enthusiasts may not know that a longer ie 2.95" throated 270wsm with quick twist is still more capable than a smaller case with same throat/barrel specs, so the 6.8 seduces them with all its moderness.

BINGO! Winner Winner Chicken Dinner!

Hence, this! 3.080 Coal 270WSM long action .200

 

[Wilderness Blacktail]

Thats a nice lookin round. What bullet? Speed?

 

[FEENIX]

What bullet?

It looks like McGuireBallistics Copper Rose.

 

[JAYgs8163]

22" 7Twist barrel
McGuire Ballistics Copper Rose
Grain Weight: 128
Estimated Ballistic Coefficient: G1 .580
Projectile Length: 1.390
I ran it up to 66 grains H4831SC with no pressure signs and 3220 FPS. Still in load development stages for this rifle as just got my ADG Brass. Also waiting for McGuires new 145/150 to come out.

 

[FEENIX]

22" 7Twist barrel
McGuire Ballistics Copper Rose
Grain Weight: 128
Estimated Ballistic Coefficient: G1 .580
Projectile Length: 1.390
I ran it up to 66 grains H4831SC with no pressure signs and 3220 FPS. Still in load development stages for this rifle as just got my ADG Brass. Also waiting for McGuires new 145/150 to come out.

Sam did an excellent job with those bullets, and I like how he promotes them. I am looking forward to your load development and successful harvests.