cart SHOPPING CART You have 0 items

Discussion Forums

Search forums

A 270 Magnum

12 Oct 2016
@ 09:51 pm (GMT)

Murray McGehan

I have often wondered if necking the 7mm Remington Magnum case down to .277 would make a good medium to long range wildcat.The goal would be to send 168 grain Amax's down range at close to 3000fps. I realise that we already have the 270 Weatherby Magnum and would think that velocities would be similar. Be interesting to hear other shooters views especially Nathan.


12 Oct 2016
@ 10:21 pm (GMT)

Lane Salvato

Re: A 270 Magnum
Seems like a 270 Alan Magnum might be pretty close to this. I'd kind of wonder about barrel life/bore life. Seems it would be a screaming barn burner.
13 Oct 2016
@ 06:12 am (GMT)

Thomas Kitchen

Re: A 270 Magnum
hi Murray
not sure where your getting 168gr .277 amax's from?? i would love hornady to do amax's in 270.
i am big fan of my 270win but the 277 bore is an odd one thats not overly well looked after with high bc projectiles.
anything is possible but you got to workout if its worth it.
the 264 win mag might be a good option.

also have a read of this thread
19 Oct 2016
@ 10:01 pm (GMT)

Nathan Foster

Re: A 270 Magnum
Hi Murray, sorry a bit slow on the uptake.

This question has been asked before here. The big trouble is as Thomas pointed out, very few high BC fast expanding long range pills. Some manufacturers make claims, but few really deliver as far as the goals outlined in the Cartridges book are concerned. The 7mm bore is in essence, a cats whisker wider in diameter. The bores are so very close in diameter, yet the the twist rates differ along with available bullet weights.

You would have to be a die hard fan of the .270 for this, and it would be best to either base it on the 7mm RM case or the longer .300 Win Mag case resulting in a .270 Practical, though it would not really be that practical as again, the weights and options are limiting. Still, Hornady may well come though with some new bullets to make this worthwhile. I do however worry that they will focus on the 140gr weight which is not ideal when one considers how very well this is covered by the 6.5. As Thomas pointed out, the .264 Win Mag has the goods in this department.

It is a strange thing. This caliber is so well loved, yet has not had a great deal of support from manufacturers. O'Connor laid the path, Frank Barnes made some accurate comments, Boddington too. In NZ, we had Graeme Henry. I hope that my notes are succinct. It's been nice to see DRT utilize my research to create their .270 cal pill.
19 Oct 2016
@ 10:21 pm (GMT)

Nathan Foster

Re: A 270 Magnum
I should mention, when I say that you would want to be a die hard fan- this should read that you would want to be a die hard fan if you were to build a wildcat rather than selecting from either the .270 WSM or .270 WBY.

150 grain bullets hand loaded, 100fps possible sweet spot range (barrel lengths etc):

.270 Win 2850-2950fps
.270 WSM 3050-3150fps
.270-7mm RM 3100-3200fps
.270 WBY 3150-3250fps
.270 Practical 3200-3300fps


We are a small, family run business, based out of Taranaki, New Zealand, who specialize in cartridge research and testing, and rifle accurizing.