270 wsm & 170 gr Bergers - OAL?

[kirkeb]

Yes...I am running a Mausingfield Long action with the 270Wby. The stock MarkV action you can only get 3.4" COAL.

Go hijack another thread.

 

[Longtooth32]

Go hijack another thread.

I must of mis-understood your question. You are shooting Short Mags in a long action and I agreed with you that I was also shooting a long action...

No hijack...the OP was asking what the OP could do with a SA...sounds like a longer mag box and some throating is the way to go...

 

[kirkeb]

Not too privey on merged threads

I must of mis-understood your question. You are shooting Short Mags in a long action and I agreed with you that I was also shooting a long action...

No hijack...the OP was asking what the OP could do with a SA...sounds like a longer mag box and some throating is the way to go...

10-4. What terminal ballistics have you encountered with the 170 at high velocities?

 

[elkaholic]

You could build a 270 SS that will reach close to 3100 with a 170 and do it at 2.925 coal. Reamer, dies, brass all available. 2.925" to lands with 170 Berger and 2.850" with 150 LRAB at 3152' with 21" barrel......Rich

 

[cjl2010]

That is such an angry little package. For a short barrel pack gun, a 170 at 3100 is unreal! Well done, Rich.

 

[elkaholic]

That is such an angry little package. For a short barrel pack gun, a 170 at 3100 is unreal! Well done, Rich.

Well, it was JUST short of 3000 with a 21" so 3100 easily with a 26".

 

[Longtooth32]

Not too privey on merged threads


10-4. What terminal ballistics have you encountered with the 170 at high velocities?

@285yrds...3225fps @ muzzle...170 Berger...270Wby

This is the opposite side wound of the entry on my Bull...

Kind of destructive...

The bullet puked its guts out...

 

[BLOODHOUND BRO]

Great info guys. I'm going to dig in to the Sherman a bit.

Regarding throating for the 170's with standard magazine, how will affect seating depth/OAL if I want to shoot 130-140's?

What modifications can be made to extend mag past 3.000? Any short actions a little longer than 3.000"? Maybe a medium action? I'd really like to stick with SA as this is a lightweight build.

 

[elkaholic]

The Tikka works great and has plenty of action length. I have a 7ss built on a Savage with a dbm which also works well. There are others that work with various mag combos as well.
Shooting the lighter bullets won't be a problem.

 

[BLOODHOUND BRO]

View attachment 91867 270 WSM M70 of mine uses 170 Bergers with an OAL of 3.115 and is 0.015 off lands. Can see how it compares with your 3.0 magazine. Had to lengthen the magazine about 0.100 to easily accommodate the OAL. Using 67gr Retumbo the accuracy node is at 3050 but it can easily be pushed to 3100. A great shooting higher SD 270 bullet using 1:8 twist, 26" barrel to deliver 1,000 lb energy out to 1300 yards or so. I think you should still be able to get 3000 or more even setting the reamer back another 0.100 to fit your magazine length.

Looking at your pic, it appears that I could set back the lands another 0.100" and still have plenty of bullet left out of the case.

 

[JTB]

Agreed. Should be fine

 

[BLOODHOUND BRO]

I'll visit with my smith about setting the lands back. Has anyone shot the 170's with ±.100 jump?

 

[Longtooth32]

I'll visit with my smith about setting the lands back. Has anyone shot the 170's with ±.100 jump?

I am shooting the 170 EOLs with a .3" jump on my 270 Wby.

20 rounds with the 170 EOL @ .3" jump. Back of the truck, bi pod, rear bag...no concern for barrel cooling. ES around 10fps for these 20 rounds...Magnetospeed...

 

[Longtooth32]

Great info guys. I'm going to dig in to the Sherman a bit.

Regarding throating for the 170's with standard magazine, how will affect seating depth/OAL if I want to shoot 130-140's?

What modifications can be made to extend mag past 3.000? Any short actions a little longer than 3.000"? Maybe a medium action? I'd really like to stick with SA as this is a lightweight build.

Do not worry about the mid-weight 270s....with a longer throat...

140gr SST with a .367" freebore @ 3625fps...