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My 300 Win Mag Sendero

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Old 08-09-2010, 11:52 PM
Silver Member
Join Date: Aug 2010
Location: Newark, Arkansas
Posts: 175
My 300 Win Mag Sendero

Took my Sendero SF II chambered in 300 win mag out for this sunday to seriously take a look at how I could group with it at 100yd. I put a leupold vx-3 6.5-20 LRT with the varmint hunters reticule on top of it and leupold mounts *what the smith recommended*. I also had him put a jewell trigger in it as well. Other than the trigger the rifle is completely stock.

Got this rifle last year got her set 4 3/4 inches high at 100 yds *was able to shoot a few times at 300 the weekend before season opened and it was reasonably close to where I wanted it at that range, just a bit high and blam! hunting season was here before I had a chance to actually see how well she would Group. Took three whitetails off my stand all three within 10 yards of the same spot that I had lasered at 351 yds. I also took 2 coyotes within minutes of each other on the side of the hill just to the east of my stand across the draw. We had lasered the hillside's farthest point I could shoot *because of vegetation* at 420 yds.

I had never been in an area that had much of a coyote population in it that would move in the daylight so didnt have much experience with hunting coyotes, durn if they arent like smoke on the water, appearing out of nowhere in and instant and never stopping.

First coyote appeared halfway up the hill out of NOWHERE just looked like it materialized out of the grass about what looked to me about 20 yards shy of the woodline we had previously lasered. The sucker never stopped moving as I scrambled to get my gun moved over *Shooting off of a fallen down tree trunk*. It was running straight down the hill at about 400 yards and I had about a 45 degree (downward) shot, just guessing, figured my bullet wouldnt drop as much as it would normally on a level shot so I put the crosshairs right between his shoulder blades and squeezed one off. No coyote in sight and I think "Dadgumit! I missed".

Aggravated at myself for missing I dejectedly chamber another round and notice movement out of the corner of my eye! There he is again running up the hill! I'm excited now and get the scope on him and put it right on his head this time thinking surely I wont be shooting high at this range according to the numbers the Online ballistics calculator has been telling me (pretty much a level shot close as I could tell), I touch another one off and no coyote visible on the hillside. I'm thoroughly dejected at this point, dreading having my shirt-tails cut by my dad but after the sun goes down I drive over there and comb the hillside with a flashlight just in case I just wasnt able to see where they fell because of the thickness of the grass and to my happiness I found one laying right where I squeezed off my second shot at the coyote heading up hill *the one I thought i had missed on the first shot*.

I head down the hill just to check the spot where I had shot at the first one and HOOYAH another one down! I found a den halfway between where both of these rascals fell. No wonder they seemed to appear out of nowhere hah!

So I thought I had myself a reeeeal shooter, after all I had never attempted to shoot anything but milk jugs at even 200 yards before with any of my rifles, yes I was truly your proverbial redneck who thought that was good enough.

So I was rather surprised when I couldn't for the life me I could not shoot any better than a 1" 5 shot group at 100 yds. I shot 40 rounds total on sunday out of my rifle and accuracy didnt seem to get any worse or any better just pretty consistent 1" and never any worse than 1.5". I was taking breaks after every 5 round session and playing with my Cz,Marlin, and savage rimfires for a while in an effort to avoid unnecessary heating and throat erosion that I have read about occuring if you shoot magnums too fast and too long.

Ammo- Nosler Custom 300 win mag with 180gr Accu-bond-the 90 doller a box "hand load" ones that come in the Plastic ammo ?carton? not the normal factory ammo type cardboard box.

As soon as I got home I ordered the Speer #14 reloading manual and the Sierra reloading manual in preperation of entering the hand-loading world.

At this point I just want to try and Eliminate ammo as my accuracy flaw and narrow it down to-

A. ME and my most likely abysmal bench technique

B. The rifle


C. The scope

I dont have too much money to put into this at the drop of a hat so I will be working my way into it.

I would like to ask would any of you guys just go ahead and have some smithing done on the gun at this point such as- Lap lugs,trueing bolt face, blue-printing action, bedding of the aluminum bedding block on my sendero, re-crown barrel? Or would you go ahead and attempt to eliminate ammunition as a factor first?

Remember I am pretty much a nublet and will be learning from ground zero on the more technical aspects of shooting long (er) ranges. I just want to get my rifle shooting 3/4 moa at 100 or better before I dive head first into the 500-1000 yard range, because I'm assuming I am shooting no where near good enough to ethicaly engage game beyond 400 yards. Im figuring I got very lucky with those coyote's.

Any thoughts/conversation is much appreciated.


Last edited by Bishop; 08-09-2010 at 11:55 PM. Reason: typo
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Old 08-10-2010, 06:23 AM
Join Date: Mar 2010
Location: on the Southern Plains
Posts: 1,138
Re: My 300 Win Mag Sendero

Sounds typical for 'todays' Remington, no matter which model. I'd conentrate on the ammo and getting set-up to handload. Blue printing and lug lapping are done when a rifle is re-barreled with a custom barrel not for re-installation of a factory barrel (that would have to be re-headspaced after blueprinting/lapping). I'm not one to put much time or money into a factory barrel (although, I'm still looking for all those 1/2" factory rifles that I hear about).
"Shoots real good!": definition; it didn't blow-up in my face. Not everything can be fixed on an internet forum!
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Old 08-10-2010, 06:50 AM
Silver Member
Join Date: Dec 2004
Posts: 347
Re: My 300 Win Mag Sendero

On line groups are always better that real groups. I shoot a 300 win, it has an aftrer market trigger and nothing else. I will re-barrel when it starts to fall off. I think being diligent about your reloading and trigger time is the way to go. I have found that most of my "BAD" groups is due to operator error.
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Old 08-10-2010, 08:21 PM
Silver Member
Join Date: Aug 2010
Location: Newark, Arkansas
Posts: 175
Re: My 300 Win Mag Sendero

Thanks for the advice guys. I appreciate it. Cant wait to get started hand-loading.

I was told today by a co-worker while having a conversation about shooting how he "knows a guy" that pulls off headshots on deer at 900 yards over a cornpile with his most adamantly "factory" weatherby mark V using weatherby "factory" ammunition. And that he had personally witnessed this and had to dress the 4 deer that his friend shot over the cornpile because he bet him he couldnt headshot all 4 of them.

If only I had managed to get one of THOSE rifles .

I saw in the Speer manual *went ahead and bought one at a local gun store in spite of the fact that I already have 2 other manuals on order* a section about the STW that referred to bullet "yaw" and that it had a detrimental effect on observed accuracy up until the range that the bullet "went to sleep" to use their terms and "settled in".
And that this range approached 100 yds. However there was no other reference to this in relation to other calibers that I read so far. Is this an isolated phenomenon dealing exclusively with the 7mm STW or does this characteristic assert itself on all calibers to some extent?
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Old 08-10-2010, 08:50 PM
Gold Member
Join Date: Jul 2009
Location: Idaho
Posts: 580
Re: My 300 Win Mag Sendero

I shoot a sendero in 7mm Rem Mag
My shooting buddy shoots one in 300 Win Mag(71 gr of H4831 sc over a 180 gr accubond)
Both are 1000+guns
The Sendero is a Great gun!
I believe handloading is a must.
I would suggest you work up a load carefullly and slowly.
As the money comes in I would
1 glass bed the action
2 Send the scope back to leupold and have the turrets replaced with m1 turrets.
3 get a good solid moa base and some good rings(I prefer seekins)
If you want some pics of what the scope would look like send me your email
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Old 08-10-2010, 09:12 PM
Silver Member
Join Date: Aug 2010
Location: Newark, Arkansas
Posts: 175
Re: My 300 Win Mag Sendero

Thanks For the reply! I have actually checked out the leupold custom shop m-1 turrets and boy they sure look sharp, and Im guessing pretty handy if your cranking on the scope alot, which i plan to do in the future!

Gonna have to check out the Base/ring set you talked about though.
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Old 08-10-2010, 09:22 PM
Gold Member
Join Date: Jul 2009
Location: Idaho
Posts: 580
Re: My 300 Win Mag Sendero

they are nice turrets
I had mine done but i was planning on it before I ordered the scope
I wanted the VX3 because of the 94 moa of travel.
You can find cheaper rings and bases but youll be much happier down the road
if you get good ones up front(you get what you payfor)
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