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Post by claydawg on Feb 14, 2016 15:30:58 GMT -5
I need help on load information and have confidence this site can answer. I just finished a small shank Savage conversion with a .45 Brux barrel (25 inches). I currently own a Rem 700 center fire conversion with a Krieger .45 (also 25 inches). The 700 was built by a professional and the recommended load is 73.5 grains of IMR4198 shooting 275 MH or 275 BE. It uses large magnum rifle primers in a cut case.
Now the question: am I safe working up to 73.5 grains of IMR4198 in my new small shank Savage/Brux. I've heard the 10 ml is not as strong of an action as the CF 700. I want to shoot .275 BE's and the primer is a 209 (CCI 209m). Any and all suggested loads are appreciated and I am very safety minded and plan to work up to any recommended loads. I want to shoot without sabots, as I do in the 700.
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Post by Richard on Feb 14, 2016 16:08:16 GMT -5
The question is one that I would not give my whole hearted blessing on. I think you would be OK? But then again, most who are shooting loads in this range are using barrels that are 1.2" in diameter for several inches past the chamber area. The small shank Savage is only 1.060 and if you measure behind the nut, it gets smaller if profiled like an original Savage barrel. Even so, you are giving up almost .150 (or .075" either side) of strength. The .45 will produce more pressure than the .50 given the same weight bullet and powder charge.
Were it me?, I would probably keep my charge under 70 gr. Use the Krieger for your heavy charge.
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Post by claydawg on Feb 14, 2016 16:30:19 GMT -5
Thanks Richard. Exactly what I needed to hear. I assume below 70 grains will create adequate velocity, but wanted to know where to draw the line. I'll probably start at 60 grains and work up. I saw a video Jeff has on youtube where he shot 55 grains in a 700 action for an older customer. I believe he was producing >2500 fps with that lower charge. I understand all builds and barrels will behave differently and I have to find what this gun likes. I just want to do it safely.
Thanks again!
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Post by dannoboone on Feb 15, 2016 13:46:42 GMT -5
Is the barrel on the 10MLII fluted like the Ashland GISML? If it is fluted, I would keep loads less than 40,000psi. I keep them around that even in the Remmy conversion, but that's just me. Are you open to duplexing? There are loads in duplexing which keeps psi in a good range with speed. I use TGinPA's pressure trace loads when working up a load for the 10MLII: dougsmessageboards.proboards.com/thread/14868/tginpa-pressure-trace-loads-hyperlinkedapp.box.com/s/7u86evwrvgn3wmxpdzndtnzjcr04dfv2To make it easier to use, highlight the bar at center bottom of page, then click on "printable", and on the next page use the cursor to highlight the bar and click on the Adobe symbol. When the next page comes up, click on Page Thumbnails icon at the upper left. This will make it much easier to navigate the encyclopedia of information. Each time you click on a load which interests you, a pressure trace graph will pop up from below, which will give you a working idea of psi as well as fps. Loads which have proven to be safe in my MLII PacNor 28" .451 barrel and 1/2 to 3/4 MOA: 10gr N110/75gr IMR3031 with 270gr Emax -3035-3045fps 10gr N110/70gr IMR3031 with 275MH - 2880fps These loads in your .458 barrel should be less pressure than my .451 barrel. |
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Post by elkman1310 on Feb 16, 2016 10:09:21 GMT -5
I had a Savage M/L which I put a small shank barrel on. It was deadly accurate. I shot it a lot with 70grs of IMR 4198 and a 300gr SST and that was my safe max load. I also used 73grs of IMR 4198 with 250 gr and 275gr bullets. You should have no problems with powder charges in that range. Just make sure your bullet is sized properly for a nice easy one hand loading and it should be a great shooting gun.
I don't build any small shank M/L'S anymore. If I replace a barrel on a Savage I do not use a barrel nut. That way I can go with a full 1.250 shank it just gives you a extra margin of safety.
Also the 50cal small shank barrel is quite a bit thinner than the 45 barrel you now have so you will be fine. I tell all my customers that 73grs of IMR4198 is the max load period. fast burning powders will spike in pressure very quickly so you got to stay within the established pressure guide lines. Stay under 50,000 psi.
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Post by claydawg on Feb 20, 2016 9:49:39 GMT -5
Thanks guys......Very helpful. I haven't duplexed yet, but am not opposed. I get the feeling I'm not the "lone Ranger" here, but I like experimenting and learning (safety first).
Elkman, I still want to get you to bed my new build once the Boyd stock arrives. I haven't been successful at finding a local gunsmith that has added the third action screw. Boyd sent the wrong stock last week, so I'm still waiting. Planning to shoot from the nice tupperware stock next week until the laminate arrives.
Dannoboone thanks for the trace data link. The barrel is not fluted, as Luke advised against it. Very helpful!!!!
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