Didn't know whether to post this in Big Bore or Reloading but I thought the Big Bore guys here will be the most help.
Like a dummy I got tunnel vision while working at my reloads and paid attention to how far off the lands for some 300 grain Barnes TSX loads for my 375 H&H. Now I notice that they won't go down in the magazine, too long!. Anyone else experience this?
When I was putting them together I thought they looked long but paid no attention to anything but the distance from the lands.
Of course in an immediate panic I looked the gun over thinking I could lengthen the magazine box but as you all know no such luck no room on a Win M70 to grow more headroom in the box.
I guess my destiny is to start over with magazine length loads and pay no attention to the distance from the lands.
Anyone else have any experience with this?
Suggestions?
Thanks

The only TSXs I've used so far were in my 378. The 300s were well off the lands and shot excellent.They're a long bullet and will still be in the case when they hit the rifleing. Try them at mag length I'm sure you'll be happy.

That is exactly what happend to me! I have a SS modle 70 in 375 h&h and I load the same bullet. I just pushed them on in till they would fit in the mag box with .010 to .015 clerance. They stil shoot very good 1'' &100 yds, with what was 74 gr of RL 15 but the new lot that I have is about two to three grais slow in my 416 so I think it will be the same in the 375.

You could still play arond with the seating depth if it did not shoot good at the max oal.

in my expereince, barnes bullets get their best accuracy "a mile" off the rifling... how do those sitting close shoot?

j

My 300 TSX loads are at least a mile off of the lands and shoot great. I initially set them at .050 off the lands and had the same problem that you have with them not fitting in the mag box. I reloaded the next set 0.1" deeper for 100% loading reliability and the groups are sub 1/2 MOA.

Jeffe
So far I haven't shot any. I just did a lot of research for some common themes with loads for the 300 grain TSX and then loaded all my test loads for RL-15 and IMR-4064 and did up several batches in various weight increments. Just before taking them to the range I made this "discovery". I don't want to bother seeing how they shoot if they will be impracticle for field use. Just seems like I'd be wasting time.
Thanks for all the info everybody and I really appreciate the good news. I'll just reseat those things to magazine depth plus a little deeper for insurance ( reliability).
Any body have trouble with max and near max loads in RL-15 with this magazine friendly seating depths?
There seems to be a lot of powder in there to compress!

Ill find out tonight if my 375 likes the new lot of RL15

If you call the Barnes people they will tell you there bullets like to be at least 50 thou off the lands. At least that's what they told me. I just don't seem to have much luck with the Barnes bullets as far as accuracy goes. I made the mistake ( ) of trying Northfork bullets and won't try another as they work great in my rifle over 72.0 gr. of RL-15.

I had a similar problem with my pre-64. I was criping Woodleighs solids and they ended up being right at the spec'ed OAL for the 375. They were hanging up in the magazine.

Swift A-frames (both 300 gn) worked fine.

Checked the magazine and it was right at the OAL. Swapped in a magazine from my 300HH and had the same problem.

As I needed to crimp othewise the bullets would set back on recoil, I ended up using the new Hornady's. If I crimped on the grove with them, they had a bit of magazine clearence and fed well. They worked fine and did a number on a buff.

-Steve

I can't remember ever owning a .375 where you could seat a bullet .030 from the lands and load the cartridge into the magazine. I have owned several and maximum OAL was always determined by the magazine, not throat length. This would be different with RN or FP bullets, they will probably hit the lands first.

Like most older cartridges, the .375 H&H was originally designed for round nose bullets and the throat and leade reamed accordingly. I can't seat bullets any closer than .20" in my Classic Stainless, but still get satisfactory grouping.

quote:

I guess my destiny is to start over with magazine length loads and pay no attention to the distance from the lands.

Yup.....and besides...this is not a benchrest gun.....

In truth most all hunting rifles shoot very well (for hunting accuracy) withour regard to distance from the lands.

Update!
I reseated all of my test loads to just under magazine length so they will cycle reliably from bottom to top.
Took these out and shot today (after zeroing my new 2.5-8 Leupold to factory loads) and the first 3 shot group was just under 1" that was 70 grains Reloader-15 and the 300 grain Barnes X, pretty nice I think then I shoot the test loads with 71 grains and it gets better .5" for 3 shots. I shot the next set of 72 grains and I had 2 shots touching and as I was squeezing number 3 a fly landed on my eyepeice and I muffed the shot. Had already shot a dozen shots by then so I wrapped it up and will re-test the 72 grains of Reloader 15 and then go on to shoot 73 and 74 grains maybe tomorrow. No pressure signs and quite a wallop on my end with my lightweight rifle but I aim to work up the most accurate 300 grain TSX load that I can and get the gun dialed in to it and just leave it alone. That load should kill anything that I will ever need it for; both bears, Moose, Elk, African game up to and including Buff.
I am excited and I don't even have a hunt planned!

I've been developing loads for my 375 H&H since October of 2004. I have great loads worked up for the 300 grain TSX and the 260 grain Partition. I shoot mine at least every other week with the Partitions and other bullets and I don't have a hunt planned for it until 2008.

I have whacked quite a few ground squirrels with it though!

I guess I don't understand why not just make a new magazine box the length you want and go from there.

quote:

Originally posted by 22WRF:
I guess I don't understand why not just make a new magazine box the length you want and go from there.

Correct me if I'm worng but I don't think that a longer magazine box will fit under a 375 M70 without major surgery.

quote:

Originally posted by 22WRF:
I guess I don't understand why not just make a new magazine box the length you want and go from there.

There's no reason to do anything with them, in this case

quote:

Originally posted by jeffeosso:
in my expereince, barnes bullets get their best accuracy "a mile" off the rifling... how do those sitting close shoot?
j

he's getting sub inch groups now

jeffe