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300RUM, where to start

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Unread 05-14-2009, 11:27 PM
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300RUM, where to start

Picked up a 300RUM Sendero and need to start some loads. I have Remington cases and have received the following dies

RCBS Neck Sizer
Redding Body Die
RCBS Seater
Lee Factory Crimp

I have taken the expander ball out of the neck sizer and it sizes the outside to .332" and have outside neck turned the brass down to .0135" thick which should give a grip of .003". So now to stretch the brass I would like to try

180 gr TSX
200 gr Accubond

I can load the TSX to within .060" of the lands and still fit the magazine but the 200 gr Accubond is going to be .110" out. Seems to me the appropriate powder would be

180 gr bullets - RL22
200 gr bullets - RL25

both of which I have plenty of. I also have plenty of H1000, IMR7828SSC, H4831, IMR4350, RL19 and IMR4831, all of which are possibilities.

My Nosler #5 shows 87 gr RL22 as the max load so a possibility would be

180 gr TSX - 85 gr RL22
180 gr TSX - 86 gr RL22
180 gr TSX - 87 gr RL22

But for the 200 gr I have no listing for RL25. If I wanted to guess I would say

200 gr AB - 85 gr RL25
200 gr AB - 86 gr RL25
200 gr AB - 87 gr RL25

Should I use the IMR7828SSC instead with the 200 gr AB?

This is just stretching the first 25 cases but I would like to start at a meaningful powder charge but still be well within safety ranges. What I'm looking for is someone who has gone through the development stages as well.

Good to go?
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Unread 05-15-2009, 12:00 AM
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Join Date: May 2008
Location: South of Canada and North of Wyoming
Posts: 6,068
Re: 300RUM, where to start

I recently got a 300 RUM Sendero so I'll be interested in your progress.

My plan was to start out with Retumbo and H1000.

My bullet choices will be...

180 E-Tips
200 AB's
210 Berger and/or JLK VLD's
177 GS HV's
and possibly some wildcats.

My choice of dies will be Redding neck sizer and competition seater and might get some custum dies later.

Keep us posted on your progress,


Last edited by MontanaRifleman; 05-15-2009 at 12:57 PM.
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Unread 05-15-2009, 09:49 AM
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Location: Sagauache County, Co...3170 sq miles, not a single stop light!
Posts: 693
Re: 300RUM, where to start

my pet load for the 300 rum is the 180grAB, 95grs H1000.....3250 fps or there about....minimum spreads, good groups....the AB performed well on a buck and bull last yr that my son harvested.....AJ
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Unread 05-15-2009, 11:59 AM
JEREMY logan
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Re: 300RUM, where to start

My factory sendero liked 87 grains of rl-25 with the 208 amax 84 or 85 grains to start out should be very safe my other load with the broughton barell is 88 grains of h-1000 210 berger it loves this one 3 shot group @ 100yrds you can cover it with a dime I NEVER RAN THEM THROUGH A CHRONY MY OAL WAS 3.060 ON BOTH LOADS
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Unread 05-15-2009, 12:41 PM
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Re: 300RUM, where to start

Originally Posted by JEREMY logan View Post
88 grains of h-1000 210 berger
I have seen this load from 88-89.5 posted several times by different people in other threads and forums. With that many people using it it mast be ok.
"I may be dumb, but I'm not stupid." - Terry Bradshaw
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Unread 05-15-2009, 12:53 PM
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Location: Wilmington NC
Posts: 4,777
Re: 300RUM, where to start


If you search for the RUM loads here and othe places you will hit some interesting info.

Retumbo seem to be the go to powder. However, seems that guys are finding the load to be from 91 to 96 gr Retumbo and some are pressuring out at 91-92 gr so be careful. MV is widely varying but topping out at 3250, and not related to the high end loads. that is with the 200 gr Accubond.

Some are having good luck with RL25 and MRP2. Have not seen any with RL22

Mag primers are normally used. either the Fed 215. Rem or wolf

200 gr Accubond is great choice to start.

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Unread 05-15-2009, 02:22 PM
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Join Date: Jul 2007
Posts: 1,055
Re: 300RUM, where to start

I've found 96.0 gr. H-1000, fed. 215, with berger 168 vld to be the best in my pac-nor bbl. 5/8" @ 300 yds. 3360 fps. Max in my rifle but shoots very well.
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