270 Winchester - Rem 700 BDL Load Development Info

[BabaOriley]

Hi all,

I'm posting this in several locations on the Internet, in hopes someone else may be interested, and have some input, or at least appreciate what I'm doing, and be able to use some of the info themselves.

Basically, what I did was take 4 powders, and 2 bullet weights, and make up 3 charges of each combination. I then took these rounds to the range and put up pie plates with a ~1" dot spraypainted on them to see what kind of groups I could register at 100 yards.

At this point, the research feels less than half done. Mainly because it felt to me like I wasn't shooting to the rifle's capability. I used a one of those cheap red plastic rests from MTM, and it just didn't look stable through the old 9x Bushnell Banner I was using. I want to invest in some good sandbags now.

If you have any questions/comments, please send them to me, so I can consider them for further testing.

Thanks!

Download the pdf containing the info I have compiled so far by clicking here.

 

[lgbloader]

Thanks for the work. I appreciate the effort. I started a simular thread just minutes ago. This is why I come to the forums. For info like this.

 

[srsmith]

Nice work ! Thanks for sharing it with us.
Your real data on velocities and groups is particularly valuable.

My 270 prefers slower powders than you show here.
Last fall, I developed a new deer hunting load after running low on H450 after all these years.
Testing included:
- H450, IMR4350, IMR7828SSC, Reloader 22
- Hornady and Speer 130 gr bullets
- Federal GM210M, GM215M, CCI BR2 primers

I settled on a stout load of Reloader 22 pushing a Speer bullet at ~3000 fps and delivering < 1MOA groups.
Two shots, two deer, no tracking.

 

[Clark]

I have done load development on dozens of cartridge including 270, but I used bulk IMR4895 [H322], canister IMR4895, and IMR4350 on 130 and 140 gr bullets.

With 140 gr Accubond moly 3.34", 26" barrel, I get [3148 fps 65kpsi Quickload predicted ]3086 fps average measured with 53.3 gr IMR4350

With 130 gr moly 3.333" 26" barrel I get [3284 fps 66kpsi Quickload predicted] and 3225 fps measured with 58 gr IMR4350.

My 270s have different barrel lengths; Ruger #1 has a 26" barrel, my pre64M70pacnor 22", and my Howa 1500 is 22".

I have written up 54 range reports.
Yesterday I took the day off from work and took two .243s I built to the range. Starting yesterday, I recorded the extractor groove expansion and tracked that with re primer insert force on a single piece of brass through many shots. I am beginning to think that long brass life with the 1889 Mauser case head design [used in .243 and 270] is a crap shoot at 66kpsi, and a more sure thing at 62kpsi. Why use small neck reamers and large neck dies for long brass life if the primer is going to fall out?


My range reports are emails with loads, group sizes, velocities, some digital pictures, etc. I print them, staple on the targets and throw them on a 6" stack. I never look through them. I do search function in the email folder to retrieve information.

Your report was a pdf that looked much more professional.

 

[BabaOriley]

Thanks for the comments guys.

My 270 prefers slower powders than you show here.

The reason I chose these faster powders was because the 90gr Sierra is the bullet I'm trying to find the load for. The 130gr Hornadys were more just to fire form the case to my rifle than anything else. At least my results go to show these powders may be too fast for that heavy 130gr bullet.

Until I get a replacement, I'm now stuck full length resizing anyway, since I went to load another batch of those 90gr with 54.2gr Varget. I stripped the threads in my Lee neck sizing die. (Popped the cap off)

 

[ADKWOODSMAN]

My old Mod. 721 Remington in .270 loves H4831 with 130 gr. Nosler bullets and IMR 4895 with 140 gr. Hornady SP's. It also shoots 110 gr. Sierra with IMR 4895 very well.

 

[BabaOriley]

My old Mod. 721 Remington in .270 loves H4831 with 130 gr. Nosler bullets and IMR 4895 with 140 gr. Hornady SP's. It also shoots 110 gr. Sierra with IMR 4895 very well.

...and all the powders I've tried here burn slower than H4895. (BL-C(2), Varget, H380, H414)

Hmm...

The innacuracy of the 130gr rounds I loaded in this test are a puzzle. I figured right away that this rifle should shoot better than it did, so blamed my own skills, and possibly the rest I used, maybe some could be blamed on the trigger?

I guess the COAL was another element. I believe I may have made an error in the pdf document, when I stated that I seated the 130gr bullets .015 from the lands in my rifle. I don't believe this is true, but am going to measure my chamber again this week sometime. I believe when I tried seating them near the lands, it left too little bullet in the case. I read somewhere to always seat a bullet to at least the bullet diameter. So, I think that is where these were seated, to exactly .277 into the case. This leaves the ogive way more than .015 from the lands.

I should ask in here why the Remington chamber is so deep. Is it designed to use the 150gr and longer bullets? Does the chamber design differ from any others, making it less accurate to seat near the lands?