ASSRA Forum - .40-50SS 300gr bullet and 300MP

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.40-50SS 300gr bullet and 300MP (Read 3296 times)

rkaires Frequent Elocutionist Offline No Stronger Bond Posts: 1671 Location: Dingmans Ferry, PA Joined: Oct 26^th, 2012	.40-50SS 300gr bullet and 300MP Mar 22^nd, 2015 at 1:51pm	Print Post
	I had a chance to start working up a load for my new 300gr tapered bullet. Starting load was 19.0gr up to 19.4gr. Velocity averaged around 1240fps for 19gr up to 1330fps for 19.4. Recoil is pleasant after 150 shots compared to my 385 and 400gr bullets. Still have more work to do. Ill be happy when the group sizes get down to about 3/4 moa. I'll try bumping the powder charge up to 20gr and work up from there next time around. The targets are ten shots at 100yds and representative of three groups for each powder charge.
	« Last Edit: Apr 2^nd, 2015 at 7:50pm by rkaires »
	ASSRA #11031 NRA Life Proud Noodlehead "Peace is that brief, glorious moment in history, when everybody stands around reloading."~ ~ Thomas Jefferson
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rkaires Frequent Elocutionist Offline No Stronger Bond Posts: 1671 Location: Dingmans Ferry, PA Joined: Oct 26^th, 2012	Re: .40-50SS 300gr bullet and MP300 Reply #1 - Mar 22^nd, 2015 at 1:54pm	Print Post
	Here's the bullet I'm using.

	ASSRA #11031 NRA Life Proud Noodlehead "Peace is that brief, glorious moment in history, when everybody stands around reloading."~ ~ Thomas Jefferson
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John in PA Oldtimer Offline Posts: 590 Location: Hollidaysburg, PA Joined: Nov 3^rd, 2009	Re: .40-50SS 300gr bullet and MP300 Reply #2 - Mar 22^nd, 2015 at 7:23pm	Print Post
	Looks like one of Tom's molds from Accurate Molds. He does terrific work. What block material did you get, brass, aluminum, or iron? Alloy? Is the nose a bore-ride diameter, or smaller than the minor diameter of the bore? Looks quite promising.

	John Wells Hollidaysburg, PA Peabody and Peabody-Martini's Wanted!
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rkaires Frequent Elocutionist Offline No Stronger Bond Posts: 1671 Location: Dingmans Ferry, PA Joined: Oct 26^th, 2012	Re: .40-50SS 300gr bullet and MP300 Reply #3 - Mar 22^nd, 2015 at 8:09pm	Print Post
	Hi John, Tom does do nice work. Its a bullet design I described to him. He made a drawing that we made some minor changes to before going with it. The mould is brass and casts great bullets. Its not nose riding. My bore/groove diameter is .401/.408. The bullet alloy is 1-20. Its a work in progress. I'm hoping to hit pay dirt as I increase the powder charge. Bob

	ASSRA #11031 NRA Life Proud Noodlehead "Peace is that brief, glorious moment in history, when everybody stands around reloading."~ ~ Thomas Jefferson
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GeorgeC Oldtimer Offline ASSRA 11411 Posts: 521 Location: Madison, IN Joined: Dec 27^th, 2012	Re: .40-50SS 300gr bullet and MP300 Reply #4 - Mar 27^th, 2015 at 9:15pm	Print Post
	I like the bullet design. What is the twist for this bullet?

	Never mind the mule. Just load the wagon.
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rkaires Frequent Elocutionist Offline No Stronger Bond Posts: 1671 Location: Dingmans Ferry, PA Joined: Oct 26^th, 2012	Re: .40-50SS 300gr bullet and MP300 Reply #5 - Mar 31^st, 2015 at 1:45pm	Print Post
	The twist on my barrel is 1-16. A little fast for this bullet but it seems to be doing well around 1300fps. Bob

	ASSRA #11031 NRA Life Proud Noodlehead "Peace is that brief, glorious moment in history, when everybody stands around reloading."~ ~ Thomas Jefferson
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