I have a pre 64 model 70 375 H-H and it wouldnt shoot well I think the scope wouldnt hold zero so I bought a new scope to try. It would put two togeather then one inch right then one 1/2 inch left it was kinda all over the place. the gunsmith said try my scope first then if that dont work crimp the cases will this help the way it shoots or is crimping just to hold the bullets in place on recoil. I've been trying to work up a load with 270gr hornady and reloader 15
Thanks

7mm:

It does sound like mounts, rings, or scope problems.

I do crimp my big bores, .375 H&H and .458WM for the reason stated. It does keep bullets from moving while in the magazine when subjected to heavy recoil. Not sure on the overall effect on accuracy as I have always crimped the big stuff.

On a side note, I have read here on AR on excellent results using IMR4064 and the .375 H&H. I will be trying some loads this weekend using this powder, but I shoot 300 grain North Fork bonded soft points and Swift A Frames not 270 grain. I have also had excellent results with Reloader 15 with 300 grainers as well.

Maybe your rifle will like another load combination better than the current one you are trying once you rule out hardware problems.

Good Luck.

RCG

Thanks alot I dont use this gun very much but its a great old gun and when i want it I want it ready Imr4064 was going to be my next try if I dont get it to shoot now

I was having similar problems until I went to H 4350. I have two .375s and both love the same loads: 81 grains for 270 grain bullets; 79 grains for 300 grain bullets.

This powder fills the case and is slightly compressed, which the .375 really seems to like.

I use the Lee crimp die on all my 375 loads and have had great luck with IMR 4350 and 4064.

Thanks fellas I'm trying it today if it dont shoot I'll try another combo

I also have a pre 64 m70 .375 although I dont crimp it shoots very well with both factory and reloads. I would try factory federal premium loads and if it still wont shoot I would suspect mounts or scope. A .375 doesnt recoil enough to require crimping in my experience.

I would just load my rounds one at a time into the chamber only. Shoot your groups this way to see if crimping has anything to do with your problem. If there are no rounds in the magazine to be effected by recoil,then each round should shoot identically to the one before it.If your group improves then crimping might be a problem.Otherwise you have another problem. Try different loads, factory ammo, clean the barrel, scope or mount problems.

I'm another fan of the Lee Factory Crimp die...keeps the compressed loads from getting longer too. I think the uniform start pressure helps--but that's another thing nobody's neutral about

Ditto the consistency of IMR 4064, RX 15, IMR 4350. Also getting very consitant results (and unparalleled metering) from Big Game.

Cheers,

Dan

FWIW,

I always crimp the handloads I make up and 90% of the time it is with a Lee Factory crimp die. The other 10% is handled by the Lee bullet seater/roll crimp die that I finish my 357's with.

The only inaccurate handloads I have ever shot were not crimped. I later crimped the rest of that run of handloads and accuracy improved.

In my experience, crimp everything...

well so far not so good with reloader 15 I guess we will try the crimping tool but I have never used one how hard are they to use

Anyone crimping the 300 gr. Barnes TSX bullets? Are you crimping on a cannelure? If so, which one. None seem to be lined up with max OAL.

quote:

Originally posted by 7mm mashburn:
well so far not so good with reloader 15 I guess we will try the crimping tool but I have never used one how hard are they to use

Just run the round up in the crimp die like you would any other die. The top of the crimp die is open and it adjust crimp tension by screwing the die in and out.

I crimp the 300 grain TSX. so far my OAL length is right on one of the lands so that's where I crimp.