I realize you're looking for a load for heavier bullets (such as 42 grains IMR4895 with Hornady 3715), but here, just to add to the thread, is a recipe from a previous post of Kuduae's for the 'lead free' 235 grain Barnes TSX (for those who shoot in lead restricted areas):

kuduae
.400 member

Re: Aussie Copper for M1910 [Re: Rothhammer1]
#309336 - 12/23/17 06:08 AM

I simply use Barnes .375", 235gr TSX FB bullets, #30486 or 37662, seated out to an oal of 77.5 mm = 3.05", in front of 55 gr VV N140. They function quite wellin my M1910 M-Sch and do the job killing game.These pointed bullets will not work as well if seated deeper.

More from the same thread:

kuduae
.400 member

Re: Aussie Copper for M1910 [Re: Daryl_S]
#309406 - 12/24/17 11:11 AM

Quote:

I have 400 or so 270 grain rnsp (as Hornady 3715) for sighting in and 'paper punching', but live in an area where any lead projectiles are now banned for hunting. Mere possession of ammunition with a trace of lead that will chamber in a firearm one is carrying or has access to while hunting here is now verboten. Hence my quest is for a non - lead projectile of the same profile (or very close to it) as DWM 531, preferably 270 grain.

Reply:

Me too. As I hunt the Lower Saxony state forests, I had to use "unleaded " bullets for 4 years now. I too have used the 270 gr Hornady RNs and still have several hundreds stored away. But by regulations I was forced to change to an available pure copper bullet. As I found, the Barnes TTX bullets have a "curvy", tangent ogive point with a small "flat" hollow point. If seated out to the max oal the M1910 magazine allows, the bullets are held reasonably close to the follower spindle by the bullet guide. Yes, my loads work in the M1910 magazine. Granted, the Hornady RNs worked a bit smoother, but there is little choice now.
Such pure copper bullets are much longer than conventional lead core ones of the same weight. The 235 gr TTX is longer than the 270gr RN, but seated out in the 9x57 M-S = .375 Rimless NE it just fills the case neck. The longer 270 gr TSX protudes into the case body, eating up powder space. So I could not load more than 50 gr N140 behind the 270 gr TTX, giving away a lot of velocity. My load, with the 235 gr TTX in front of 55 gr N140, reads out 2400 fps from my 50 cm = 20" barrel over my chrony.

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kuduae
.400 member

Re: Aussie Copper for M1910 [Re: Rothhammer1]
#309445 - 12/25/17 02:08 AM

Quote:

Have you, by chance, any experience using IMR4895 with the barnes copper projectiles? I had been running 42 grains of it behind the Hornady 3715. It's been some time since I reloaded, but I have recently laid in a supply of the IMR. Perhaps I can find a 'conversion' for (x)N140 = (x)IMR4895.

Reply:

No, sorry! The other way around, I sometimes used 4895 data with N140 when nothing was available. Afaik N140 is just a bit slower burning, so reduce my load by about 5%.
I started using VV N140 about 50 years ago, when it was still named "Kemira 16" and came in small 200g, yellow tins. It was then the only rifle powder available to me. Later, the Vihtavuori powders were less pricy than all others and, even more important, always available locally. So there never was a reason to change a winning team. Additionally, here in Germany you are only allowed to store up to 3 kg = 6.6 lb powder at home. This makes experimenting with different brands of similar properties a bit difficult.

An important note, also from Kuduae, to ensure that the cartridges feed smoothly through the Schönauer magazine:

Loaded cartridges for the M1910 should at least have a Diameter of about 7.5 =.30" at 70 mm = 2.75" from the base for proper function in the magazine. Other bullets with very slim, pointed noses will be hopeless, as they may be too slim 8 mm behind the point to be held properly to the spindle.