300 RUM - Sharing of load data

[whacker1]

Insert Quote
Quote from: haugenna on February 13, 2009, 10:38:36 PM
Just loaded up some practice rounds to take to the range.  5 of each 97, 98, 98.5, 99, and 99.5.  COL is at 3.600.  180 Grain Nosler Ballistic tips with Fed 215M primers.

Is it me or is that bullet buried in that case???   Anyone else run into that?

After going through the steps to touch the lands and then seating .015 to .03 deaper to ensure that I am not touching the lands - my COAL ends up being 3.74.  I backed it off to 3.72, but this is still to long to fit in the magazine.  The Magazine is actually 3.69.  So I called a couple friends and they are seating at 3.63 and 3.65.  I ended up putting all of mine at 3.65, as this was the longest I could be and still fit all three rounds in the magazine.  I finally get to shoot this thing soon.

I loaded 165 Accubonds at 96 grains of H1000 with Fed 215 primers, I loaded 180 grain accubonds with 96 grains of powder, and 180 grain combined technology balistic silvertips with 96 grains of H1000.  I will let you know in the next few weeks how it turns out.

Thanks for all the help

[haugenna]

I am heading to the range this weekend to let off some steam and shoot the RUM.  I will post the feedback.

[haugenna]

I finally got to the range to shoot the 300 RUM this weekend.  I was pleasantly suprised.  I have all the load data in a notebook and no time to enter it.  Lets just say this for now.  I shoot a 30-378 weatherby as well and was VERY SUPRISED when I achieved 3350fps with the RUM using 10 grains less powder.   I was shooting 180 accubonds.  I didn't do much grouping b/c the mirage was a little rough.  Next weekend will be another trip.

[haugenna]

The results are in.  I have made a few trips to the range and had some good luck and some bad luck.  All in all I learned a lot about the gun.  I did a little ladder test over the chronograph and was very impressed with the speed.  The groups on the other hand, not so impressed. 

I was not happy with the runout (.003 to .007) of the bullets I was shooting.  That might have been the problem.  I changed to a RCBS Gold Medal Match Seater die.  (.001 to .003) I was not happy with the seating depth either.  I changed them both and got the results I was looking for. I changed it from 3.600 to 3.663.

H1000 and the 200 grain accubonds was much slower than 200 grain accubonds and retumbo.  I got the 200 grainers going about 3250.  Got to be too much recoil on the gun.

Retumbo and the 180 grain Ballistic Tips and Accubonds proved to be the best combination. 

98 grains I had the bullet going 3350.  It takes 108 grains in my Weatherby 30-378 to get the bullet goin that fast. 

I ended at 100.7 and capped her out at 3487.  Pretty darn fast but pretty darn hot.  I backed it off a little bit to 100.2 and was moving the 180 grain BT at 3460ish, give or take.  What was more impressive was the groups that it shot.

I seated the bullets as far out as I could in the magazine.  COAL came to 3.663.  Charge was 100.2 grains of Retumbo. Bullet was 180 gr BT and Accubonds. Primer is a Fed215M.  Brass is R-P weighing 268.7 to 270.2 grains.  Both had the same POI.  BT were a little tighter.  The picture is the BT.  The gun is a Stock Remington LSS with a 26" barrel.  (purchased on this site) Lightened the trigger, installed a muzzle brake, bedded the action, and replaced the spring in the bolt.  ($550)


THE TARGET WAS SET AT 300YDS!!!!!!  There are 6 shots here.

[Red Dawg]

wow you have that gun shooting great. Nicely done.

[whacker1]

great information.
Thanks for sharing

[Jamieb]

Congrats on a fine group. Looks like your getting things ironed out pretty well

[JoshT]

A .30 cal 180 at 3400+ ain't no joke!

Nice work... I have some 180 NBTs sitting on my bench, and about 5 pounds of Retumbo... might be worth playing with.

[Jeremiah P]

Do you happen to know how many grains it would take to keep the speed right around 3250? And if the grouping would be at all similar?

[haugenna]

Do you happen to know how many grains it would take to keep the speed right around 3250? And if the grouping would be at all similar?

JP,

I didn't go that low.  I am going to guess around 95-96.  Only one way to find out and that is to shoot it.   Thats a starting point though. 

I did chronograph some Federal ammo and that was right around 3268fps.  The weight was 180grain, not sure the manufacturer.  I think speers.