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300MP in fixed cartridges (Read 5956 times)

Chris C Senior Forum Member Offline Posts: 327 Location: Deep in the woods of Oklahoma Joined: Feb 12^th, 2014	300MP in fixed cartridges Mar 15^th, 2017 at 9:48pm	Print Post
	Anyone on the forum shooting fixed rifle cartridges with 300MP? If so, I've some questions.

	Chris
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UtahDave Senior Forum Member Offline Posts: 396 Location: Heber City, Utah Joined: Aug 14^th, 2010	Re: 300MP in fixed cartridges Reply #1 - Mar 16^th, 2017 at 10:01am	Print Post
	Chris, You should PM John Louis, he has been shooting 300 MP for some time with great results. I use it in my 32-40 and I do OK but I don't practice enough and haven't messed with perfecting loads or seating depth. Dave


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UtahDave Senior Forum Member Offline Posts: 396 Location: Heber City, Utah Joined: Aug 14^th, 2010	Re: 300MP in fixed cartridges Reply #2 - Mar 16^th, 2017 at 10:03am	Print Post
	Opps, you said FIXED loads Sorry, no experience with that but I'm interested to see how the might shoot.


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Chris C Senior Forum Member Offline Posts: 327 Location: Deep in the woods of Oklahoma Joined: Feb 12^th, 2014	Re: 300MP in fixed cartridges Reply #3 - Mar 16^th, 2017 at 10:19am	Print Post
	I've already asked John and since he doesn't shoot fixed, he couldn't answer my question.

	Chris
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John Boy Ex Member	Re: 300MP in fixed cartridges Reply #4 - Mar 16^th, 2017 at 10:56am	Print Post
	Chris - what are your questions?


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Chris C Senior Forum Member Offline Posts: 327 Location: Deep in the woods of Oklahoma Joined: Feb 12^th, 2014	Re: 300MP in fixed cartridges Reply #5 - Mar 16^th, 2017 at 11:15am	Print Post
	I've been shooting 300MP breech seated in my 1885 Highwall for several months now. But before John Lewis got me set up doing that, I shot some fixed cartridges with 15 gr in .38-55 for that rifle. I've got a Marlin lever action 1893 in .38-55 and I'm wondering what might be a safe load to shoot in that rifle. The 15 gr fixed was giving me an average velocity of 1262 fps. My Marlin is a 115 year old rifle, in excellent condition, with a smokeless marked barrel, so I "think" that load would be safe for it..................but with my lack of experience I just want some folks with more knowledge than I to give me an idea if it is............or recommend a different load.

	Chris
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frnkeore Frequent Elocutionist Online Posts: 7674 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: 300MP in fixed cartridges Reply #6 - Mar 16^th, 2017 at 11:26am	Print Post
	Your rifle is made for ~40,000 CUP loads, depending on the weight of the bullet, your 15 gr load is well under 18K. Personally (me not you), I wouldn't be afraid to go up to 20 gr 300MP. If you'll give me the weight of the bullet, barrel length and the COAL, I can run a QL pressure on it, if QL has 300MP. If not, I'll run a similar but, fast powder, like 296. Frank

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Leo1885 Junior Member Offline Posts: 85 Location: Beaverton, OR Joined: Sep 30^th, 2007	Re: 300MP in fixed cartridges Reply #7 - Mar 16^th, 2017 at 12:06pm	Print Post
	I use it in my .357 Mag rifle with very good results.


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Chris C Senior Forum Member Offline Posts: 327 Location: Deep in the woods of Oklahoma Joined: Feb 12^th, 2014	Re: 300MP in fixed cartridges Reply #8 - Mar 16^th, 2017 at 3:37pm	Print Post
	frnkeore wrote on Mar 16^th, 2017 at 11:26am: Your rifle is made for ~40,000 CUP loads, depending on the weight of the bullet, your 15 gr load is well under 18K. Personally (me not you), I wouldn't be afraid to go up to 20 gr 300MP. If you'll give me the weight of the bullet, barrel length and the COAL, I can run a QL pressure on it, if QL has 300MP. If not, I'll run a similar but, fast powder, like 296. Frank Frank, the COL is 2.545". 280 gr bullet. 26" Octagon barrel. 1893 Marlin.

	Chris
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Chris C Senior Forum Member Offline Posts: 327 Location: Deep in the woods of Oklahoma Joined: Feb 12^th, 2014	Re: 300MP in fixed cartridges Reply #9 - Mar 16^th, 2017 at 3:41pm	Print Post
	Leo1885 wrote on Mar 16^th, 2017 at 12:06pm: I use it in my .357 Mag rifle with very good results. Leo, is that with a lead bullet or jacketed? I don't shoot jacketed, but I've read that with a 158 gr XTP, 18 gr 300MP will push the bullet at about 1839 fps. I have yet to work with the 300MP and lead in my 1984C Cowboy Ltd.

	Chris
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frnkeore Frequent Elocutionist Online Posts: 7674 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: 300MP in fixed cartridges Reply #10 - Mar 17^th, 2017 at 3:14am	Print Post
	Chris, I don't have 300MP in my data base but, 296 and 4227 are faster powders. 300MP is a slower powder so, it would produce lower pressure for the same charge. I forgot to ask thelength of your bullet so, I used 1.1. If it's shorter than that, the pressures will be a little lower. 20.0 gr Charges H4227, 19,700 - 1493 fps W 296, 20,900 - 1565 fps Frank

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Chris C Senior Forum Member Offline Posts: 327 Location: Deep in the woods of Oklahoma Joined: Feb 12^th, 2014	Re: 300MP in fixed cartridges Reply #11 - Mar 17^th, 2017 at 9:18am	Print Post
	Thanks, Frank. Yes, the bullet is shorter than that..........though without going out to my shop, I couldn't tell you the length. I made a mistake, it weighs 240 gr. It's a Lazer Cast .38-55 bullet from Oregon Trails. How much less powder charge do you think would be safe? I've shot it in a fixed case with 15 gr. (but that was in my 1885 Highwall)
	« Last Edit: Mar 17^th, 2017 at 9:42am by Chris C »
	Chris
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frnkeore Frequent Elocutionist Online Posts: 7674 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: 300MP in fixed cartridges Reply #12 - Mar 17^th, 2017 at 10:45am	Print Post
	Chris, Don't be affraid to use that 15 gr charge of 300MP in your 38/55. But, to maintain the same velocity and pressure as the BSed load, you would reduce it by 1/2 to 1 gr. The reason is that when the bullet is installed in the case, it reduces the capacity of the chamber. In load developement, I would not be afraid to start at 14.5 and work my way to at least 20 gr, in .5 gr increaments. Stop at the best accuracy or where it gets uncomfortable on your shouder. Your pressure won't exceed 20,000 and your rifle is good for twice that amount. I hope that helps, Frank

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Chris C Senior Forum Member Offline Posts: 327 Location: Deep in the woods of Oklahoma Joined: Feb 12^th, 2014	Re: 300MP in fixed cartridges Reply #13 - Mar 17^th, 2017 at 10:49am	Print Post
	Indeed it does, Frank. Thanks a bunch for taking the time to research that.

	Chris
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Leo1885 Junior Member Offline Posts: 85 Location: Beaverton, OR Joined: Sep 30^th, 2007	Re: 300MP in fixed cartridges Reply #14 - Mar 17^th, 2017 at 12:31pm	Print Post
	Chris C, My Marlin is like yours, and I use 18.6 grains with 158 grain jacketed bullets. I've tried many combinations of cast bullets and powders, but could never get good accuracy.


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