300Ultra Range Report

[huntinco]

I hope this helps you 300Ultra guys. Aside from the Retumbo group , I'm sure you could improve on some of the groups if you seat the Bergers further into the lands

Load Data 5-22-08
Temp 51-55 Humidity 31.5%
Christensen Arms Custom 300 Ultra Mag
Shilen Select Match Grade 1-9 Twist
Leupold VX-III 4.5-14x50
5 shot group with 1 fouling
Berger 175-VLD seated .001 into the lands.
Range 108 yards

Powder Avg Velocity Vertical & Horizontal Grouping
H-1000 "88.5gr" 2902 1.340 0.710 OK!!

RL-25 "92.5gr" 3151 2.480 1.975 SUCKS!!

Retumbo "97gr" 3221 0.295 0.159
SUPER GROUP (good luck improving on this)!!!!

N-560 "84gr" 3011 1.489 0.731 OK!!

Magnum "98gr" 3215 0.631 0.699 Excellent!!

IMR-7828 "87gr" 3152 2.130 1.060 SUCKS!!

IMR-4350 "80gr" 3186 0.946 0.995 Good!!


Sierra 180 HPBT Match seated .005 from the lands

IMR-4350 "80gr" 3101 0.764 0.555 Excellent!!

 

[diderr]

nice write-up, I would have been nice to include pictures of the targets.

 

[huntinco]

Would you 300 guys please share your load results.

 

[splattermatic]

i am one of those that is not hooked on heavy bullets..

my pet load is 96.0 grains of reloader 22 under a 150 barnes tsx, at just slightly over 3600 fps with a 26 inch barrel.
i most likely could go faster, but ragged holes say "no"..
besides a cow elk at 723 yards this past season, didn't like the load much.... 1 shot... 1 kill...
sighted in 2.5 inches high at 100 yards, 13 clicks up puts me dead on at 500 yards....
gotta go look at the cheat sheet to tell ya the rest...

 

[hodgehodge]

huntinco : im currently testing the last round that you mentioned (SMK 180gr) , my question is -How do you know howfar to seat the bullet from the lands and how do check how far they are ?

 

[Longshot38]

my question is -How do you know how far to seat the bullet from the lands and how do check how far they are ?

hodgehodge there are a couple of ways to measure your chamber. The best way I have found it Honadys Lock-n-Load OAL gauge. There are also a few other methods that I am not very familiar with.

 

[huntinco]

I use the method longshot38 posted.

 

[hodgehodge]

im not sure im getting this, so i just slip this gadget into my chamber and it tells me how big my chamber is exactly and then i know how long i can make each round . is this it?

 

[Eaglet]

im not sure im getting this, so i just slip this gadget into my chamber and it tells me how big my chamber is exactly and then i know how long i can make each round . is this it?

You also buy a threaded (at the primer hole) brass for each caliber you want to measure; you thread in the Hornady device end (male) into the threaded brass until is tight. Now you put the bullet you are interested in measuring in the brass making sure that it goes quite deep and that the rod that slides in and out from the Hornady device will be serving as a stop. Take the bolt out of your rifle, slide the previous explained setup and push it all the way in until it stops. Holding that in place with one hand loosen the rod bolt that holds the rod in place and push this rod in which in return will be pushing the bullet until it touches the lands. Have to be careful here and the rod just needs to be pushed until your smoothly feel the bullet contact the lands. Lock the bolt that holds the rod, pull the whole thing out, measure it using dial caliber. Repeat it until you're satisfied of the results. Now whatever that dimension is would be for just touching the lands. Then you just go from there.
It's easier than it sounds.

 

[hodgehodge]

ok thankes i ordered one today,
huntinco just wondering but do you recall the col of the Sierra 180 HPBT Match load that you listed back there ???

 

[huntinco]

I did not measure the COAL as I was using a "comparator'. Make sure you also buy a comparator!

 

[Tyler Kemp]

I just get a piece of brass, slit the neck and resize. You should be able to slip a bullet in fairly easily. Put your bullet of choice so it barely stays in the neck, and chamber it in your gun. Pull it out CAREFULLY and measure it. Repeat until you get consistant results. Then determine your COAL.

 

[Eaglet]

I used to do something similar until I finally got sick of it and decided to go for the more accurate way. I would bite the unsized neck putting little dents around it just enough to hold the bullet slide it in until the blolt closed. Also tried many other methods like smoking the bullet with a candle etc. etc. etc. Not consistent enough. JMHO. Using the system above and the comparator as huntinco suggested is been the most accurate way I've been able to do it with.

 

[pressman]

to measure to the lands i just take an old case and make to small splits down the neck about a 1/4 -3/8 long and then I just start the bullet in the case and when i chamber the round it will seat right at the lands ( just be a little careful when you eject the case) then i measure it. save that case for other bullets for the future