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Sendero 300 Rum load advice

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Unread 08-13-2008, 06:00 PM
Junior Member
Join Date: Jul 2008
Posts: 7
Sendero 300 Rum load advice

I have just started shooting my new 300 RUM sendero. I would like to get my grouping under a 1 1/2 @ 200 yards. I have been trying different loads using Rutumbo with 200 GRN AB's. groups are poor so far. THe best i have come up with so far is 2 1/2 group with 180 ab's over 90 grn of RE-22.
does anyone have any load that work well in this particular rifle and cal.
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Unread 08-13-2008, 06:48 PM
Gold Member
Join Date: Jul 2006
Location: AB, Canada
Posts: 556
Re: Sendero 300 Rum load advice


i used 92.5 retumbo, with 200ab. col-3.681.
wou have to pay with bullet seating depth.
did you do bedding, and free floating barrell?
how about triger job to 2lb?
if you do this you will see drastic improvment on factory senderos.
My 338Edge
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Unread 08-13-2008, 09:24 PM
Silver Member
Join Date: Aug 2008
Posts: 170
Re: Sendero 300 Rum load advice

100 grains of Retumbo pushing 180 grain Barnes TSX. Sub MOA groups out to 400 yards, and sub inch groups at 200 yards. The load is lightly compressed, which Retumbo seems to like, I've got 3 other rifles that really like Retumbo when it's a compressed load.

Now I do everything to the brass that I can do, I neck resize, turn the necks, deburr the flash holes, unform the primer pockets and trim to length. I use bushing dies and try to keep the neck tension down to .002, I usually go for less than that, but this thing kicks like a mule and I don't want to mess up the rounds in the mag.
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Unread 08-14-2008, 09:55 AM
Bronze Member
Join Date: Dec 2007
Location: spokane, washington
Posts: 76
Re: Sendero 300 Rum load advice

i use 89.5 gr of 7828 behind a 180 gr. sricocco. three shots make one ragged hole at 100yards.
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Unread 08-20-2008, 01:01 AM
Bronze Member
Join Date: Jun 2007
Location: Riverside, CA
Posts: 70
Re: Sendero 300 Rum load advice

90.5g retumbo 210 bergers I believe .005" in the lands shot really well for me (one hole) at 100 yards and I am new to this.

I do have a 1.5# trigger and it is bedded. This was prone off the bipod
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Unread 08-20-2008, 08:21 PM
Bronze Member
Join Date: Mar 2008
Location: Wilsons,Va
Posts: 53
Re: Sendero 300 Rum load advice

200gr AB and 93gr of RL-25 at 3150 fps= one ragged hole at 100 yards.
"Some people spend an entire lifetime wondering if they made a difference. The Marines don't have that problem. "
Ronald Reagan
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