I posted in the Reloading section but received no response so I try my luck in here.

I was wondering if it is common for the Winchester 70 stainless in 375H&H to have a long throat...? I measured my OAL with the Sierra 300gr and the Hornady 225gr and come up with an OAL of 3.820" for the Sierra and 3.880" for the Hornady. It is impossible to get even close to the lands with such throats since my magazine box limits me to around 3.600". I do not wish to single load each shot so what are my other options?

If anyone is in the same boat, please share since I wonder if its a defect or the standard throat length on this particular model.

Regards,

Enigma

The bigger the bore, the less important for accuracy to seat to the lands. Far more important is the tolerance in the throat. Not only that, but there are plenty of small bores out there that shoot MOA with long throats. Just do your nornal load work up and accuracy development ignoring the lands and see what you can get. It may surprise you.

I load my .375H&H so that COAL with the bullet I want to use fits in my magazine (and feeds properly).

George

I don't have any experience with the M70 but Ruger #1's in 375 definitely have long, oversize throats. I wouldn't be surprised if the long throat is a SAAMI spec. SAAMI dictates questionable throats for a number of cartridges.

Enigma,

Just to add a little to your question.

When shooting 458 Win. in a 458 Lott, what problems are caused by the additional 3/10th's inch of bore-out? Should the bullets be seated out further and crimped hard with a crimping die?

Roger QsL

Roger,
Normally none, that is a theretical opinnion that has been passed down from publications...

I have, over many years, shot short bullet in long throats, such as 120 gr. Sierras and 130 Speers in my Brno 7x57s withoul any loss in velocity...I have shot a lot of 458s in 458 Lotts with any loss in velocity...I suppose it has some basis and it would depend largly on the individual rifle, but mostly it has no noticable effect...

I have to agree with Ray and Sabot,
My 416 Taylor has a lot of free bore. I tried to see what difference it would make by single loading with bullets just off the lands and loading to fit the magazine box. There was no difference in accuracy and both loaded to 2400 fps.
Take care,
Dave

Enigma,
Clymer shows a throat for the .375 H&H with 0.1750" of parallel-sided freebore of 0.3770" diameter plus a 2 degree leade.

The RCBS book shows no parallel-sided freebore with only a 2 degree leade starting out with a whopping sloppy diameter of 0.3900" tapering down with a 2 degree leade over 0.344" until it reaches the lands.

Compare to the new .375 Weatherby throat:

A tight 0.3755" freebore diameter (parallel-sided) that is 0.3700" long, and a leade of 1 degree and 2 minutes.

I would consider cutting off your threads and setting the barrel back a bit and rechambering to .375 Weatherby for best results.

RIP,

I have the Reamers from Dave Manson... I ordered them after reading that long discussion on AR about the advantage of the WBY over the H&H etc... I just didn't have the guts up to now to bring my gun to Winnipeg for the re-chambering! I still have that love affair with the H&H... Thanks again everyone for all the sound advice.

Regards,

Enigma

P.S. What a pain in the butt to get reamers from the US to Canada!!!

quote:

Originally posted by Enigma:
RIP,

I have the Reamers from Dave Manson... I ordered them after reading that long discussion on AR about the advantage of the WBY over the H&H etc... I just didn't have the guts up to now to bring my gun to Winnipeg for the re-chambering! I still have that love affair with the H&H... Thanks again everyone for all the sound advice.

Regards,

Enigma

P.S. What a pain in the butt to get reamers from the US to Canada!!!

Enigma: You wise already.

And if your rifle shoots accurately with a good load assembled as George says, No Problem!