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Discussion Starter #1
Sir,

The Accuratte manual shows the max 375 win load around around 40,000 cup, whereas industry max is around 52,000.  I am assuming that its more a case of case capacity running out before pressures become excessive.

My Savage model 99 allows the overall cartridge length to exceed industry standard, to an OAL of nearly 2.8 inches.  I can think of no better use of this available case capacity than to put some more fire behind it.  

I am not a hot rodder by any stretch, but I do see some potential here, and I am thinking it can be done safely and be fairly  impressive, ballistically.  

Would welcome your thoughts and recommendations reference this matter,

Thanks for your help,

Steve
 

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Steve

I also have a 99 savage in 375 Win. and I have been thinking along the same lines. Anything that increases case capacity should decrease pressure and taking advantage of the 2.75 in. cartridge length that the 99 allows will increase case capacity.

Sure would be nice to get Marshalls thoughts on This subject.

Buz
 

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The .375 Winchester is loaded somewhat light because the round can be chambered in old, blackpowder .38-55
rifles. What the engineers were thinking of when they designed the length is beyond me but there it is. Now how much it can be increased is a question best answered by very slow, deliberate handloading.
I would say a 5-10% increase in powder charges is within the realm of possibility while still maintaining a safe margin for pressure. But again, this is only a suggestion and one that needs to be cautiously approached. I nor Beartooth Bullets can assume any responsibility for injury or damage caused by such practices.

That said, exceeding data tested by the powder companies in pressure barrels is inherently risky. A few extra fps aren't worth the risk to your rifle, you, or the people around you. The .375 is a useful cartridge as is, particularly so in your Savages where pointed bullets can be used with complete safety.



(Edited by Bill Lester at 7:54 am on Aug. 9, 2001)
 

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Discussion Starter #4
Thank you  Mr. Lester,

I know that any information about exceeding published data espeically to an unknown individual is paramount to handing a stranger a cocked and loaded pistol, and this is what i have encountered when i have asked this question elsewhere.  

Your reply has been the most informative and honest, and I certainly will proceed carefully if i decide to attempt this, probably a third to a half grain at a time, and carefully inspect and measure for any signs of pressure.  Actually, the catalyst for this thinking of mine was a piece that Marshall wrote in this forum reference using fireformed 30-30 brass, giving +/- 6% more capacity for marlins and winchesters.  As i don;t have to worry about min length, i thought i could use thicker brass, seat the bullett out an ace, and work it up from there.  It has been my impression that the savage is stronger than the tube fed levers, but that is not something that i can prove.  

In this i will certainly not hold Mr Lester individually or Beartooth bulletts collectively accountable for my expirement, and i will share what i come up with privately or publicly, whichever is more preferred from the liability standpoint.  Ya'll may have to wait awhile for the results, as i plan on being most deliberate in load cultivation.  

Good to see my WV Neighbor is properly armed, I'm right across the border in Ky, and I'll make sure to mention it to the McCoys that i run into.  I'm thinking they are still shooting tube fed levers.  <!--emo&;)--><img src="http://beartoothbullets.com/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'><!--endemo-->

Thanks Again,

Steve
 

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I've used Marshall's directions on fireforming 30/30 brass to 375 one time previously.  The results were that what I ended up with held about 3% more water by weight than factory, once fired 375 Win brass.  The 38-55 cases actually held about 6% more water than same.  I just happen to have 40 more cases sitting on the bench waiting for the same transformation this weekend.  I'll check their capacity as well but don't expect to see much difference from the first try.  If there is I'll let you know.

First, be very careful about hurting yourself and bystanders, for sure.  But secondly, don't destroy a firearm that a lot of us have never held/shot...there weren't that many of them made.  Of course, if you would like to preserve a rarity by trading it to someone for a real shooter...:)

BTW, I'd sure like to see Marshall do a piece on the 375 Win, a la 444, since he has so much experience with it.  There are a few 375 junkies on the board.
 

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Bart,

You make an excellent point. There were very few 99's made in .375 and owners should be careful in handloading. If their rifle is damaged, that may well be it for the combination for them. I can't remember the last time I saw a 99/.375 for sale, and that one held a serious premium I certainly couldn't justify.
 

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Gentlemen,

I'll be sure to get a post up here that is informative on the .375 Winchester.  I do have volumes of data, and yes, the .375 in 99 Savage can be uploaded do to the longer COL that it affords.  It just takes time to put all the nuts and bolts of things together, and I have to dig out old data to do it!  However, I promise not to forget you, but right now I am very busy, perhaps after the weekend I'll get a post up that everyone will appreciate who are .375 Winchester junkies!

God Bless,

Marshall
 

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Discussion Starter #9
Good Morning,

Since we have spoken last i have gotten some more input, from three different sources, that have striking dissimilarities.   Goes to show, the more i learn, the less I find out that I know.  Reckon it would be good fyi for the group:

Source 1, a major powder manufactor, told me that it was very feasible, and for the most part any space created could be put to use with more powder without any real risk.  They did temper their comments with adivising me to use caution in developing these loads, discontinue if there was pressure signs, etc, as one would epect, but the gist of the communication was "go for it'

Source 2, Sierra bullets, advised that the gains would be minimal velocity wise, and told me that lengthing the oal would have several disadvantages, namely, not being able to use the crimp/ cannelure, so seating would not be consistant, and accuracy would suffer.  Turns out, sierra recommends that crimping be done on all straight wall cases, this i both did not know and have not done.  Shame on me?  Anyway, Sierra didn;t get behind the idea, at all.  Said the risk outweighed the gain, big time.

My third source,  a gentleman i know, that left the industry to fly helipcopters for us.  He told me that the pressure side shouldn;t be much of a problem, but there were a few things that were problematic based on the limitations of the case.  Namely, if i seat the bullet too far out, the primer pop may dislodge the bullet enough that it may cause ignition to be erratic.  The worse case here, would be the primer force pops the bullet clear of the case mouth before the powder is completely ignitied.  He recommended at least a caliber length of seating depth- between .3 and.4 in, so that this would not take place.

I aquired this rifle last year, and to be honest have not done much with it, as its capibilites in my battery are eclipsed my a couple of three other rifles.  It belonged to an old man that kept it in his gun safe, and except for a little bit of cracking on the recoil pad, is truly mint.  

So, although it is not a hunter for me, yet, upon reading this forum my interest in it has been re-kindled, and with the increase in performance it may yet earn a place with the working guns.  I honestly have no idea what the thing is worth, or what i would ask for it if someone tried to talk me out of it.  My 99R 300 came to me all fixed up, and i am having a hard time locating the accessories for this 99A that would make it a huntable.

I am truly looking forward to seeing Mr Stanton;s data, though.

Have a great weekend,

Steve
 

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Marshall,
 Given any time to the .375 win yet ?  I have a Big Bore 94 that's begging for some range time with some cast bullets.....45nut
 
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