Let's talk muzzle velocity....

[Biggerhammer]

Go with the .270 WSM, the .270 Win is a anemic slouch.🙃

[high country]

Go with the .270 WSM, the .270 Win is a anemic slouch.🙃

Until reloder 26 is put into play.

[jrebel]

For argument sake, I ran the numbers between 2700 fps and 2900 fps....negligable to 400 yards, or am I missing something. 

[bobcat]

Try 2700 versus 3100. I think the biggest advantage is in reduced wind drift.

[jrebel]

Not sure I can get the 150 grain bullet to 3100.  Not data suggest I can even get close out of a 22" barrel. 

[high country]

Reloder 26 easily takes a 150 over 3k in 270win.

[Magnum_Willys]

Ive seen the magnum primers increase pressure and sometimes increase speed a lot or not at all depending on powder. I think they spike pressure initially and if there was unburnt powder with lesser primers then speed will go up. If all the powder was being used before the pressure will spike but drop off quicker so no speed increase. 

[Curly]

Here are the ballistic tables for 2700 fps and 3050 fps.  Wind speed was 10 mph.

[jrebel]

Well.....I bought a pound of Reloader 26 and worked up a few loads.  I haven't chrono'd them yet, but I did have a revelation.....my groups have tightened up with hotter loads.  This is different than any other powder I have worked with on this rifle.  60 grains of Rl 26 had the best groups.....though not as good as I would like, definitely workable.  I will work work a 60.5 for a max load next and see what happens then play with bullet seating depth. 

One thing I am not crazy about....These loads will surely burn the barrel out significan't quicker as it heats up very quickly. 

If I get a load that groups well, I will chrono them....I am sure they will be pushing 3K, which is very surprising to me. 

Updates to come.   

[bobcat]

Cool!   

I don't know if I mentioned my load before, but I used 61.2 grains with Berger 140 grain VLD's and got 3100 fps. This is with a Browning A bolt and 22 inch barrel.

[jrebel]

Well after multiple attempts and lots of tweeking, I cannot get rl26 to stabilize the 150 grain partitions.  Best groups I could produce were 1.5".  Being that I have started this journey and also that my other 6.5 creedmoor is shooting so well, I have decided to work with a few more loads.  Next will be 140 grain bullets (vld hunters and accubonds).  I will update as my progress goes for others that are looking accurate .270 loads.  Worst case scenario I go back to my 150 grain partitions at 2700 fps.   

[high country]

If they are not keyholing, stability isn't your problem. I'd be curious to know if your brass is anealed, and if you've tried big (.2") jumps. I bought 8lbs of 26 and fought it in my 270 until I understood that it builds pressure late so the ignition cycle is critical to get right. Consistent neck tension is paramount if the bullet cannot be jammed....ime.

[CP]

Well after multiple attempts and lots of tweeking, I cannot get rl26 to stabilize the 150 grain partitions.  Best groups I could produce were 1.5".  Being that I have started this journey and also that my other 6.5 creedmoor is shooting so well, I have decided to work with a few more loads.  Next will be 140 grain bullets (vld hunters and accubonds).  I will update as my progress goes for others that are looking accurate .270 loads.  Worst case scenario I go back to my 150 grain partitions at 2700 fps.   

1.5" is plenty accurate for a big game round.

[jrebel]

Forgot to get out of archive mode so didn't get the first chrono.  Here is a 5 shot group with 4 shot chrono using 51 grains H4350 and 140 grain burger VLD Hunting bullets.  I think this load is a keeper.  As for getting better velocities....well, my rifle just doesn't like speed, I guess. 

Series   12    Shots:   4
Min   2774    Max   2791
Avg   2781   S-D   7.9
ES    17      
         
Series   Shot   Speed      
12   1   2774    ft/s   
12   2   2785    ft/s   
12   3   2776    ft/s   
12   4   2791    ft/s   
----   ----   ----   ----

[Biggerhammer]

What barrel length? That's right on par with 7x57 velocities with the same weight bullet.