Home Forums Hunting & Shooting Hunting Rifles 300wsm vs 270 wsm as compared to their peers??

.......typo's....

Thx Ingwe,

I'd think he'd do more than 3360 with a 26" tube though? Shouldn't he?

Guess my thinking is that with a Roberts AI one might be fairly close to that wouldn't you?

Either way it'd be a heck of a yote rig...

Dober

The 26" tube is what had me wondering. I'd think a Roy would beat that speed with the same length tube, but I've never owned one.

Not "Poo-pooing" the idea, it would still be a neat wildcat, but if the case capacity were the same, I would have thought it would beat 33 and change from a 26" tube.

My re-barreled & accurized Kimber Montana in .300 WSM weighs 6 lbs, 3 oz. (without a scope) and shoots Federal factory ammo with 180 gn Barnes TSX slugs into 3-shot 1/2" groups at 100 yds with an average muzzle velocity of 3150 fps.

IMHO, the WSMs are not about the cartridge but about the short-action rifle that shoots it.

--shinbone

...........Shin..........At 3150 fps with a 180 gr Barnes, I assume you have a 26" barrel? You either have a faster bore in that Kimber or that factory ammo is just a wee bit on the hot side; maybe both? Maybe Federal is now using the RL 17.

Agree with you! The 300 WSM is more about the rifle rather than the cartridge.

A friends 270WSM will get 3200+fps with a 140gr Accubond. That's off the chrony! So we see a clear 200fps over the 270Win.
Some other buddies(I have clocked(270Roy) 3300+fps with a 150gr TSX) of mine have achieved 3500+fps(270Roy) with a 130gr, without trying too hard either.
The 270Roy would be my No.1 pick if I needed a flat-shooting SOB that hits like a clap of lightning, without the recoil. Especially so with slow powders!

Just thinking it over some makes me want another 270Roy in a Wby U/L. 130gr TTSX at 3500 with R25 is something very very special.
If you do the energy numbers(ft/lbs) on that combo you will be in ORE!

OK some might not believe this but I will add these figures(chony'd) for those who have an open mind.
Rifle was a 270Roy, Mark V U/L.

My friend is a loyal Roy freak. He has had em all, tested em all & loves em all!!! From custom Crowns, Alaskans to early west Germans.

"I started at 77gr re25 and worked up to 86.5gr with the 130pill and velocity ranged from 3404 to 3797fps.

once again i have no signs of pressure in regards to primers or re-chambering or case head expansion and case length stays pretty much the same"


INPUT VARIABLES
Firearm type Rifle Sight Height 1.5
Bullet Weight (grains) 130 Ballistic Coefficient .460
Muzzle Velocity (fps) 3790 Temperature 59
Barometric Pressure (hg) 29.53 Relative Humidity 78%
Zero Range (yards) 375 Wind Speed (mph) 0


BALLISTICS TABLE IN YARDS
130 interbond 130 gr., .460 B.C.
Range (yards) Muzzle 50 100 200 300 400 500
Velocity (fps) 3790 3664 3542 3308 3087 2877 2677
Energy (ft.-lb.) 4146 3875 3622 3159 2751 2389 2068
Trajectory (375 yd. zero) -1.5 1.1 3.0 4.8 3.4 -1.6 -10.8
Come Up in MOA -1.5 -2.1 -2.9 -2.3 -1.1 0.4 2.1

I could get published velocities (3300/130 gr) with two 270 WSM's but could not get book speed with two 300 WSM's. With modern bullets I cannot see how the 270 WSM would not kill anything on the planet and in a lighter, better fitting package.

For kicks and Pro-forms I work a couple of nights a month at our local Wholesale Sports, formally Sportsmans.

In looking at what all the stores sell, you can't give away
a 270 WSM yet the 300 WSM's are selling off the shelves, literally.

That said, for resale, the 300 WSM is the better of the two.

Cartridge Information 270wsm; 300wsm; 338wsm
Index Number Cartridge Type Weight (grs.) Bullet Style Primer No. Ballistic Coefficient
PRA270WSMB Premier� AccuTip� 150 AccuTip� Boat Tail 9 1/2 M 0.525
PRSC300WB Premier� Scirocco� Bonded 180 Swift� Scirocco� Bonded 9 1/2 M 0.507
PRC338WA Premier� Core-Lokt� Ultra 225 Core-Lokt� Ultra Bonded 9 1/2 M 0.456


Velocity (ft/sec)
Cartridge Type Bullet Muzzle 100 200 300 400 500
Premier� AccuTip� 150 AT BT 3160 2972 2792 2618 2452 2291
Premier� Scirocco� Bonded 180 SSB 2960 2274 2595 2424 2259 2100
Premier� Core-Lokt� Ultra 225 CLUB 2780 2582 2392 2210 2036 1871


Energy (ft-lbs)
Cartridge Type Bullet Muzzle 100 200 300 400 500
Premier� AccuTip� 150 AT BT 3325 2941 2595 2283 2002 1748
Premier� Scirocco� Bonded 180 SSB 3501 3075 2692 2348 2039 1762
Premier� Core-Lokt� Ultra 225 CLUB 3860 3329 2858 2440 2071 1748


Short-Range Trajectory
Cartridge Type Bullet 50 100 150 200 250 300
Premier� AccuTip� 150 AT BT -0.1 0.5 zero -1.5 -4.1 -8.0
Premier� Scirocco� Bonded 180 SSB 0.1 0.6 zero -1.8 -4.9 -9.4
Premier� Core-Lokt� Ultra 225 CLUB 0.2 0.8 zero -2.2 -5.9 -11.2


Long-Range Trajectory
Cartridge Type Bullet 100 150 200 250 300 400 500
Premier� AccuTip� 150 AT BT 2.1 2.5 1.8 zero -3.0 -12.8 -28.5
Premier� Scirocco� Bonded 180 SSB 1.5 1.4 zero -2.6 -6.7 -19.3 -38.7
Premier� Core-Lokt� Ultra 225 CLUB 1.9 1.6 zero -3.2 -7.9 -23.0 -46.5

The 300Roy/150gr & the right powder will clock 3700+fps, without signs of pressure! Now that's smokin!

Anyone running a 270 Wby with a 130 @ 3700 and a 300 Bee with a 150 @ 3700 is either smoking something and or really itching to have a gun blow up.......(and or both)

Dober

That's smokin alright! Crack Cocaine this is.

I can assure you I DO NOT do drugs!

R25 is the key to some of the Roy rounds with lighter pills.
If one goes up to a 150's(270) or 180's(300) R25 does not seem to work like it does with lighter projectiles.

Do your self a favor. Buy a Roy, work up loads carefully, mic just in front of the belt, check primers & see for yourself.

The problem we have here is that some do not open their minds & let their mouth flap.

I can even pull the email from Alliant regarding these loads if needed. Or better still. Email them yourself & see the response they give you regarding 130(270Roy) & 150's(300Roy) with R25.
It's a SAFE load WITHOUT signs of pressure in the Mark V!

One becomes ignorant when ones mind closes. Something to think about expert!

What is the pressure?

I've never tried to exceed the 3500fps/130gr in the Roy, kind of figured it was "good enough". That said, it was no problem to achieve it in a 24" barrel. I'm not sure I'd want to take a TSX or TTSX to that level.

...............I can understand a little skepticism here by the poster above who thought you were smoking some crack! However, I don`t think you are.

3700 fps or slightly more, for a 150 gr bullet out of a 300 Wby, is quite a jump from the maximum listed velocities from Hodgdon, Nosler, Lyman, which all list maximums at around 3400 and slightly over. And even Alliant, lists the 165 gr @ 3258 fps using the RL 25.

So! About 450 fps faster for bullet, that is only 15 grains lighter than the 165 and with no pressure signs???? Has Alliant recently come up with a new enhanced kernel formula for their RL 25 similar to what they did with RL 17???

How many additional grains of RL 25 over the listed maximum charges would be needed (that already get 3400+ fps with the 150 grainer) to achieve 3700+ fps??? And doing so without pressure signs??

300 fps or thereabouts, is quite a jump from the listed maximum loadings, whether it be from a Mk5 action or any other action.

About 55-70,000psi depending on load!
Remember Norma factory ammo is around 70,000psi, plus in some cases.

You can also use 'quickload' to get an exact figure. I do not have that package but if you do send me a PM & I will supply powder & grains used.

I will also try to get the exact info once I can contact my friend

There's a problem here alright.





You will supply powder?

I thought you were using RL25?

Sounds like you have a friend who reloads for you.

Good for you!

If your load is safe why does it need a PM to be given?

Let me/us know how many grains and I'll run it a QL for you.

Thank you!

You are going to show us something new here.