375 h&h + 250 ttsx

[Magnumitis]

I just bought a Sako 375 H&H and am really wanting to use the 250 gr. Barnes TTSX in it. I will be using Nosler brass but am not sure which powder to go with yet. My manual suggests several IMR powders but I'd like something more temperature stable. Does anyone have any advice on powder or any load info to share?

 

[dig]

Have been loading shooting the 375 H&H for years. Currently shooting the 270 Grn Barnes in one with IMR 4064 , 70.0 Grns. Powder seems very temp stable. My other "longer range load" used is H4831sc with the 260 Grn Nosler Accubond, Norma brass. I believe 78.2 grns (double check) out of 26 inch tube at 2744 fps no pressure. Groups in the .75 inch range considering the bullet diameter is .375 I'll take it! The Accubond has a pretty good BC and I have been shooting it to 800 yards very consistently. Overall I have had the best luck with 4064 and go back to that most of the time max loads are not compressed in the 70 grn range with 250 Grn Bullets and seems less pressure. Of course work your way up as I know I am close to max by most books.

 

[Magnumitis]

Good to know, thanks for the info!

Do you remember where you started with H4831sc and the 260 AB?

 

[dig]

on the 75 grn range. Again the 4064 provides better velocity.

 

[brentc]

Something like Varget or RL15 would be good choices with that bullet.

 

[HARPERC]

i was just wondering if you got around to shooting the 250 TTSX, and how it worked out for you?

 

[Lefty7mmstw]

I'd think of I 4320 for the 375 h@h. I'm using it with the 260 nosler ab and the 300 tsx and a cci mag primer in either rem or a-square brass. I'm getting 2550 fps and sub moa accuracy out of the rifle and it's a 8# er scoped.

Dang year old thread......

 

[HARPERC]

Dang year old thread......

I did see that, but thought maybe Magnumitis had some experience to share, now that a year passed.

 

[Lefty7mmstw]

I did see that, but thought maybe Magnumitis had some experience to share, now that a year passed.

just teasing.... I don't think it was that old. Just a little peach fuzz, no facial hair...

In my 375 the barnes is a heck of a ticket. I'd probably try the 250 tsx or hornady's mono in similar weight as I could shave a bunch of drop off, but I've got a couple of good 30's and a 338 for mid-weight pointy slugs so I haven't bothered.

 

[HARPERC]

I was unaware of the Hornady, thanks. I mostly would use my 338 RUM as well, but kind of in the middle of a facelift (stock) that may not be done in time, so digging a little deeper in the safe. I've actually got plenty of other ammo, but I was thinking of doing something new to hold my interest a bit more. Hunting down components these days is more interesting than I planned. R15 is about as available as moon dust. I was able to find bullets though. My old .375 warhorse is always ready for one more charge, and the old school ammo still works.

 

[benchracer]

I fooled around with the 250 TTSX's some. Accuracy was sub-3/4" @ 100 yards with CFE 223. I don't remember the powder charge, but it wasn't max. I never chronoed the load, so I don't know how fast they were going.

I wouldn't hesitate to use the 250 TTSX's, but I decided that I like the heavies better. The JBM ballistic calculator tells me that my 300g Hornady BTSP handload has a very similar trajectory to a .308/175. The Zeiss calculator for the RZ-1000 reticle agrees. Since I just happen to have one of those, I am going to try it on my .375. It will be an interesting combo if it works out.

If you decide you want some more 250g TTSX's, let me know.

 

[65WSM]

I had the pleasure of developing a load for a friend in Sitka. With the light for caliber 270 Barnes Triple Shock I got 2706 from 77.0 gr and 2775 from 78.0 gr of Vihtavuori N-540. My friends Model 70 had the front sight wacked off and a muzzle brake installed at 22 inches. His issue was the crimp not holding the rounds in the magazine while shooting. We also learned that the standard Warne rings were not up to the task. I will show the scope rings slipping in a second post. The Barnes has a wide ring to crimp to and the Lee "Factory Crimp" die worked with my RCBS Rockchucker but his Bonanza Co-Ax does not have shell holders to bump against and would not crimp properly. He uses a friends press to crimp after he has assembled cartridges.

 

[65WSM]

My load data and a photo of the slipage on a set of Warne permanent rings. The "quick detach" version has 2 more screws, holds top and bottom of the ring and performed much better. Warne took care of me and swapped permanent for quick detach rings straight across and paid for shipping to me. To be fair, I have also had a pair of Talley quick detach rings slip on a 6.5 WSM and they replaced the rings. In this case one of the rings bottomed out and did not have a gap to tighten too. The replacement Talleys were rough inside and had to be lapped.

 

[Lefty7mmstw]

I'm surprised you had trouble with the tsx bullets moving under recoil. I've been shooting the 300 tsx for 5 years now in my 8# remmy 375 at 2550 fps and I haven't had one move, and I haven't even been crimping them. Between neck tension and the relief grooves in the bullet biting in I've never had an issue.

As to scope sliding I've gone with burris steel rings and weaver bases with a straight 6x Nikon Monarch nestled in with no lateral play. I was out at the range one day and noticed my group had crawled up a few inches but was still moa; turnes out I was shooting moa groups with a loose scope!! Turned the screws back down and all was well ( with a bit of loc-tite of course).