You are dealing with totally different case size and powder selections and burn rates, and a pressure curve that is completely different. You can't just go and take data from a case that is smaller, put it in a different case and think it is going to work. There are reasons the load manuals have published starting loads.
the powder load for a 30/30 may not fill the case enough to create an even pressure curve, to explain more there are really 2 distinct pressure spikes, when you partially fill a case the potential for the second spike to be deadly increases 3 fold. I don't know how the spike happens but it can kill, I know I do not want to mess with pressure in the 50,000 psi range 6 inches from my head in a rifle that could be 100 years old...
the powder load for a 30/30 may not fill the case enough to create an even pressure curve, to explain more there are really 2 distinct pressure spikes, when you partially fill a case the potential for the second spike to be deadly increases 3 fold. I don't know how the spike happens but it can kill, I know I do not want to mess with pressure in the 50,000 psi range 6 inches from my head in a rifle that could be 100 years old...
point taken. Now, does anyone actually have a load for a Mosin carbine? The published data doesn't always specify the barrel length and it's not always obvious from the data which is a "faster" powder. The load book for the 7.62x54r states that the rifle used was a M91 Westinghouse. That's a much longer barrel then a 91/59 and while the loads are doubtless safe and tested, they don't necessarily mean that they are the best for all rifles and all barrel lengths.
What I am hoping to find is someone who actually KNOWS the Mosin and has worked up a load that suits the shorter barrel.
FWIW, I've sent an email to Vitavouri asking them for recommendations for the carbine. If the Finns don't know the Mosin, no one does.
Try using 47.6 grains of AA2495 going about 3,000 fps. that load is for the 123 grain V-Max hope that helps if you want to lower the powder amount the LOWEST to go is 41.2 grains but the first load is accurate in the MN I load for.
thanks Jim. I'll give it a try when I can find that powder. After discussion with the gunsmith out at the range today I got some Viahtuori 140. That seems to be the most versatile. The gunsmith said that I would get my best results from a powder that came the closest to filling my cartridge, regardless of barrel length. He also seemed to feel that a fast powder was not my best choice, again regardless of barrel length. Guess I'll have to experiment and see what works for me.
My M-44 likes 49.5 gr. of H4895 behind a Horn. 150 gr. S.P. Interlock. I use Win. primers and Grafs cases. I'd have to dig out my load book to find the OAL.
Put "powder burn rate" on your search and print a chart.Find a powder reccomended for your powder.I have best results using reccomended powders of faster burn rate in shorter barrels and slowerburn in longer barrels.He got in before I was done,but you really can't go wrong with IMR?H4895 as he says. ,,,sam.
Thanks Jim. I've printed the data sheet. Right now I have some 147gr pulls and some .311 125gr SP. I'll probably look for a heavier bullet, but the 147gr oughta give me a pretty good idea with some different powders.
it's not always obvious from the data which is a "faster" powder
If you have the Lyman 49th edition check page 458 for a Burn rate chart.
It seems that every one here assumed you are using a JACKETED bullet, though that was not stated in the first post. If using a CAST bullet then it MAY be acceptable to use a pistol powder like Unique or 2400, but only if it's published data. I've used Unique and 2400 behind a 170gr hard cast bullet in my .30-06 with decent results.
