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havegun View Drop Down
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    Posted: February 10 2009 at 10:29am
Just read the previous post, Reloading Article, and saw that guns and ammo listed Winchester 748 as a suitable powder for the 303. I was wondering if anyone has tried it, and if so, what results did you get?
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Ed Hill View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ed Hill Quote  Post ReplyReply Direct Link To This Post Posted: February 10 2009 at 11:43am
Just checked the Hodgdon reloading center, no recommendation for 748 from the manufacturer. I think I'd stick with one they provide reloading data for.

Ed
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lithgow Quote  Post ReplyReply Direct Link To This Post Posted: February 10 2009 at 5:32pm
From memory, 748 is for 223 size. I used 760 in my reloads for the 303.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Cookie Monster Quote  Post ReplyReply Direct Link To This Post Posted: February 10 2009 at 7:59pm
Originally posted by havegun havegun wrote:

Just read the previous post, Reloading Article, and saw that guns and ammo listed Winchester 748 as a suitable powder for the 303. I was wondering if anyone has tried it, and if so, what results did you get?
 
I looked in 3 of my Manuals and there is no information listed in those for the Winchester 748 powder for the 303 british. I have several more I will check for you.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: February 10 2009 at 10:41pm
Found a few recipies in my "All in one loadbook"
I haven't ried any of these so work up loads blah, blah, blah.
 
Hornady.
#3120 150 gr SP.
starting load 33.7 gr for 2200FPS
Max load 43.3 gr for 2600 FPS.
 
#3131 BT-FMJ
starting load 32.8 Gr for 2000FPS
Max load 40.0gr  for 2400FPS
 
SIERRA
#2300 150gr SP
starting load 37.2gr for 2400FPS
Max load 42.9GR for 2600FPS
 
WINCHESTER
150gr WINCHESTER PSP
45.4gr.  MAXIMUM ONLY LISTED for 2565FPS
 
A few thoughts at random on this.
748 is a double-base powder, so it'll be as "HOT" as cordite.
Its a high energy powder so I'd guess you'll have lower %fill than single-base powders, I have no idea how that'll effect accuracy or consistency.
Thw Win load is a .311  dia bullet, all the others are .312. I hope that's why the volume for max is listed so much higher than the others.
 
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Coleman Quote  Post ReplyReply Direct Link To This Post Posted: February 10 2009 at 11:57pm
I have some old Winchester load guides that do have load data for several bullets in 303 using W-748. Winchester no longer list W-748 for use in 303. It does leave a lot of space in 303 and Winchester has changed their primers.

From the 1997 Winchester 15th Load Guide 303 British was a new listing and the first year 303 was in the Winchester Load Guide.

123 grain SP bullet - 47.3 grains W-748

150 grain PSP bullet - 45.4 grains W-748

180 grain SP bullet - 39.8 grains W-748

180 grain SP bullet - 46.3 grains W-760
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Cookie Monster Quote  Post ReplyReply Direct Link To This Post Posted: February 11 2009 at 12:09am
Shamu on those powders that require less volume. I use pillow stuffing made of polyester burns completely with no residue and does not effect pressures. Not a one hang fire. When light loading large capacity case like 300 Winchester Magums this is a must.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Coleman Quote  Post ReplyReply Direct Link To This Post Posted: February 11 2009 at 12:15am
Current data from Winchester

174 grain Sierra Match King - 46.0 grains W-760

180 grain Sierra SP - 46.0 grains W-760

Old Hornady Data

123gr - No Winchester powder shown

150gr - 43.4gr W-748

174gr - 40.0gr W-748

Old Sierra manual doesn't show Winchester powder for 174 - 180 grain bullets.




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John Coleman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Coleman Quote  Post ReplyReply Direct Link To This Post Posted: February 11 2009 at 12:50am
Normally most ball powders don't heat the barrel as much as most extruded powders are are suppose to cause less barrel erosion than most extruded powders. I don't know about the barrel erosion but I have noticed the barrel does stay cooler or at least doesn't heat up as quickly, when using ball powders but I haven't used much ball powder in 303 but I have in other calibers.

The WWII Winchester 303 military ammo was loaded with early Ball-C powder. This powder was modified several times since WWII to reduce fouling in gas operated firearms and to reduce muzzle flash and at some point the name was changed to BLC(2). the WWII Ball-C powder is not exactly the same as current production BLC(2) but it's still close. The WWII load was around 42.7 grains of old Ball-C powder with a 174-175 grain bullet in a heavy military case.


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