Anybody got a pet load for the 270gr TSX? I am planning to work up a load over the winter months while the barrel will cool fairly quickly.

270 grain TSX
115 gr H4831 or H4831sc
Fed 215 primer
Norma Brass
COAL 3.760
3 shot group @ 100 5/8"

Steve

The 378 can be downright scary-accurate at times. I have a custom that has shot groups of 5/8ths" at 300 yards. It's like having a 22-250 but with 270gr bullets! The Barnes or Northfork are the only bullets I'd consider in the 378, due to the velocity and the unknown range at which you'll encounter a large animal. Or, of course, Michael's new Non-Com bullets.

Biebs

Most of you know how I am about 375 caliber, but I won't let the detour me from getting you boys some proper bullets! 375s are being worked on as we speak--starting out with a 300 CEB #13 solid, and matching NonCon that will be around 270 or so I imagine. Then taking it down to 9.3 as well--I want some for my 9.3 B&M. I think I will start with 9.3 at 270 with the solid, and then either 240-250 with the NonCon to match it.

Good Stuff. On the 9.3 not really sure I even need the solid, and use North Fork--it's excellent as well.

Michael

I am shooting a Mark 5 Deluxe with an HS Precision stock. I was planning to use it in Alaska on a brown bear hunt but used my 338/378 instead. The load I had originally worked up is Fed215M, 104.5gr of IMR4350 and a 270gr Swift A-Frame. This load will shoot sub moa. I had also shot a few Swifts using 114gr of h4831sc that shot fairly well.The 270gr TSX shot very well in my 375H&H so I thought I would try them in the 378. Thanks

Steve,
When I looked at your OAL of 3.76" I thought that was a little long. I went down stairs and checked the OAL for my 30-378 loads with 180gr TSX and they are seated to 3.74". I think I will start there and then fine tune. The factory loads are around 3.655 I think.

Ed

With the free bore I seated the bullet out as far as possible and made sure they fed correctly. I also tried 3.70 with good results also. I tried that COAL in both my 378WM with good results Let us know how it works for you.

Steve

yeah some others like the 378. I love mine. I have a wby DGR and it shoots like a dream. I shot a whitetail with it for fun this year with a 300gr tsx. I was going to go out with the 450NE but it was raining. Where I live we can shoot a lot of whitetail due to high population levels and I think they are great practice for africa. You can work out any problems you find in the field before you are half way around the world.

In my 378 Bee

260 AB with 114 gr RL22

115.5 rl 25 with the 300 Accubond

quote:

Or, of course, Michael's new Non-Com bullets.

What is that?

I don't have a 378, but I am curious about what kind of velocities can be had with 350-380gr bullets? Also with that much powder how long a barrel before it becomes cumbersome?

Andy

All the 378WM come with a 26" barrel (DGR 24" I believe). I have one with a 25.5" and the other has 27.5" Neither one feels cumbersome at all.

You can get a 350 grain bullet up around 2700-2800 fps.

Steve

I went to the range today and shot several loads with H4831 and IMR4350 with the 270gr Barnes TSX. I will post more later but in general here were the results. I seated to 3.74" OAL for all loads. I started at 109gr of h4831 and went up in 1gr increments to 114gr.
At 109gr it grouped about 1.75" at a mv of 2900fps. As I increased the powder it increased velocity as you would expect and the groups started to shrink at 113gr and mv of 3072fps (1" group). At 114gr of h4831, I started to see some pressure signs but the group was .5" or less and the velocity was 3095avg. I loaded 4 sets of three rounds with IMR4350 starting at 101gr and went up to 104gr. All of the groups with the IMR4350 were triangles of about 1"+ or - .25". The velocity started at 2856 with the 101gr and the top velocity at 104gr was 3030fps (ES 1) with no pressure signs at all. I think I am going to up that load to 105gr and maybe 106gr to see what the groups do. If you looked at the IMR4350 groups, you would think they were the same load.

Ed

Thanks for the update that is very interesting indeed. Are you shooting a Mark V Weatherby?

Thank You

Steve

Yes, it's a Mark V Deluxe that I put in an HS Precision stock when I thought I was going to take it to Alaska on a brown bear hunt.

I went back to the range today and tried 105 and 106gr of IMR4350 with the 270gr TSX. The velocity was 3050 with both loads with no increase. The velocity with the 104gr load was 3030. The 106gr load shot a group that measured .54". After I shot all of the test loads with the IMR4350, I shot another group with the H4831 load of 114gr. The weather today was 30 degrees warmer that last weekend and more humid. The group with H4831 was .75" compared to last week at .435" and the velocity avg was 3105fps vs last week at 3097fps. With that kind of accuracy and velocity, I don't see any need to try any thing else.