Home Forums Hunting & Shooting Ask The Gunwriters .270 Win./150 gr. Velocities...

That's my general experience with increasing neck-tension by sizing necks down more--and have done enough experimenting to be pretty well convinced the reason is harder seating, which tends to increase bullet run-out.

Which is why I suspect the Lee "factory crimp die" tends to work a lot of the time: It results in more consistent bullet-pull, without changing run-out, even in necks that aren't super-consistent in thickness.

If you believe that the (maybe) 50-75 fps you might gain by going to a 2" longer barrel is going to make a noticeable difference in the field or on game then you might be better served with one of the super fast magnums.

Yep!

One of the realities of big game rifles/cartridges is that most bullets lose 200-300 fps in the first 100 yards, depending on whether they're flat-based spitzer or high-BC bullets.

I was using a Sako A7 1:10 twist and testing varying loads of Re26, the (59) grain was the most accurate shooting at 300 yds.

[quote=Mule Deer][quote=high_country_]

Makes sense. Do you think the LFC die will replace “jump” to some extent?

my current 270 is 22 inches but I've noticed many new rifles now are 24 and 22 is getting less common. I don't see the need for it and wonder why it's changed.

even Kimbers are 24 in a 270

Because of chronograph envy.

Off the wall question.........if a 24 inch 270 barrel will push a 150 grain bullet 75 fps faster does that mean the recoil is more than one with a 22 inch barrel with the exact same load?

Yes, but whether if its enough to matter to you is another question.

The other question is whether another 75 (or even 150) fps results in greater "killing power."

My std. .270 Win. workhorse load is a 150 gr. Speer GS on top of 55 gr. of IMR 4831/CCI 200, for ~ 2800 fps from a 22" Bbl'ed 8.5 lb. all up rifle.

This rig produces right ~ 18 ft-lbs of recoil, and 1500 ft-lbs and a little over 8" drop at 300 yards (200 yd zero).

IF - one simply adds 75 fps at the muzzle?

... recoil goes to 18.6 ft-lbs, and energy/drop at 300 yds is 1590 ft-lbs and a little under 8" respectively.


Call it 3.3% recoil, and 6% and a 1/2" ballistics.


Not worth it to me.

YMMV




GR