I'm a fan of 300 rum. You should do some research on stocks and magazines. If you buy a stock I don't see why they can't get the right mag for any caliber.

This is an example of how far forward I like a scope to fit me so you can see why mounting options are so important to me the back of the scope needs to almost be at the back of the trigger

I think the biggest problem will be bullet variety. Unless I'm wrong there wasn't much to pick from in the .277 caliber compared to .308, .284 and .264. Maybe with the new flavors of 270's that has changed.

Had a few 30 cal mags over the years including 300 rum. I ended up making it a 358 rum then sold it. I've got a hs precision coming in 300 rum when the nephew brings it up. I'll go and twist my gunsmith ear and see what a guy can do about changing the bottom metal.

That is quite far forward. Holla. Almost pistol scope territory.

Watch your total weight. My only attempt at a custom 280-AI resulted in a rifle that was too heavy and too long to enjoy in the field. I used a 26” Shilen match grade and a McMillian stock. Action was Remington 700. With scope and ammo it probably weighted 11lbs. On trip out west cured me. Sold it.

it is a hybrid case with a stainless steel head and it runs 80K psi

I think in a civilian rifle you can already get the ballistics they are and more and in a bunch of packages just all with longer than 16 inch barrels

so if your goal is near 270 ballistics in a 16 inch barrel sure but if you don't mind a little longer barrel you can get it all at more normal long action pressures in a 270 and probably not burn the barrel out near as fast , have plenty of case availability. and in normal times buy a box of ammo in every farm store , sporting good store and even some hardware stores, gas stations and bait shops.

Ok so You want a accurate walk in hunting rifle? Moose Gun etc. 300wm will be better then a 26noz. Your new 300wm might be a shooter already, with some load development and testing? Some times we can get a factory rifle to shoot very well with the right ammo. If it wont shoot you can always True the action and Rebarrel it.

Norwestalta , on ammo seek right now there are .277 caliber bullets listed in 85,90,100,110,120,127,130,140,145,150,160, and 165 grains. Biggest animals I ever killed with my 270 were elk. 130 grain sierra boat tails. I have some nosler 160 grain partition but my rifle wasnt accurate enough to suit me with them. I think I would want to be less than 200 yards from a moose with it but I think it would work. I been shooting SST's in my 300 win mag. Will try some in my 270 some of these days, got a bunch of sierras loaded though right now.

I know there are heavier bullets available than 165 but I did not see any just now.

I am fairly tall and my eye is just the normal 3.7 inches behind that scope the other option is add to the stock but that puts more weight out front , more to blow around and a longer package overall

my actual length of pull is 14.5 inches I just learned to shoot guns that a come factory around 12.75 to 13 inches by moving the scope forward , with EGW it makes scope mounts with extended rails an easier option than extendingt he stock , but yes all my rifles look about like that scope even with the back of the trigger

I do add some to the stocks on some shotguns to make them fit a little better

I was thinking more of a 270 performance in a short action (im kind of a 788 guy). I mean most custom rigs are just bragging rights about having something cool anyway unless ur into bench rest type of shooting. Look at the OP. He's building a custom in a caliber that he already has and the gun he already has is probably more than capable and probably better (because or weight and length) for everything with the exception of off a bench at the range.

Mark I know what you mean. The 300 wm is no slouch but I've had 300 wm, 300 rum, 308 nm and a 300 wby and I found each and everyone of them to be ignorant to shoot. I told myself a while ago that I will not go down the 30 cal rabbit hole again. The 26 nos that I currently have is very pleasant and still has lots of ponies down range to get it done. 550 yd elk is not a problem and it still has gas in the tank.

Danny, interesting on the .277 bullet selections. It's been a few years since I've paid attention to anything in 270. I used to use those sst's in my 338 wm, 30-06 and a couple of those 30 cal mags. I got great accuracy but I found they lacked in penetration. Never had a problem with deer or moose but I found I tracked a lot of elk with them. Since I've switched to barnes and nosler bullets and haven't looked back.

Pete, you must be a giant of a man.

Yep. I didnt get the alphabet right. Barnes TSX is what I was talking about.

Lol. Ya the are expensive but I've found they really anchor a animal when shot from near or far.

You won't regret going with the 6.5.

It be me, I'd go with straight flutes and a lite weight stock of your flavor for hunting. Heavier is nice for steel ringing and its not hard to switch out so maybe two stocks?

A good scope is a must imo for either, spend money there first before you worry about the heavier stock.

Friend tipped me off about those TSX bullets and pressure. Need to look up barnes TSX data before you load them.

Yessir, no need for me to brag. A rifle to me is little more than a tool to get a job done. I'm sure you appreciate quality. If it'll shoot consistently anytime and everytime it is worth it imo. I don't require anything cosmeticly pleasing, just reliable and accurate.

Yep for sure. Pretty important to measure properly.

the civilian version of that is the 6.8 western a 270 in a short action , just at normal pressures with more available brass and ammo