300 RUM project

netman

WKR
Joined
Mar 30, 2018
Messages
764
Location
Indiana
So I have a Remington 700 ADL 7RM that I have decided to use as the foundation for a 300 RUM.
I stripped the rifle down to the action and barrel.
I ordered a Wyatt 4”magazine box .
I bought a brand new take off Remington 700 300 RUM barrel for next to nothing.
Today I took the barreled action to a gunsmith.
He is going to mill/ fit the magazine box to the action, set the headspace, thread the barrel and install a muzzle brake. Mill the bolt stop.
I’m going to try and use the ADL Tupperware stock.
I decided to go with the factory barrel for now. My thinking is if I like the caliber I’ll have a custom barrel fitted to it later. If I don’t like the caliber I’ll rebarrel it to a 300 WM or ???
Now for brass and dies.
I plan to start with 215/230 Bergers or 200 Accubond.
I’m hoping the ADL stock will work out as I’m not a big fan of carrying a rifle with a DBM while hunting. Worse case scenario is I’ll pick up a BDL stock.
Should be up and running in a couple weeks.
Anything I left out or thoughts?
 
I have 3 300 rums and had to rebarrel 1 of them @ 1500 rounds. They last along time if taken care of. I run 90 grains h1000 with a berger 215 and they shoot awesome! 300 rum is my favorite caliber by a long ways. I also have 7rum and 338 rum but the 300 rum is what does it for me.
 
You will probably have to use some shims/material to take up the slop from the mag box to the bottom of the stock. ADL boxes are taller than BDL boxes. Also you will need to clearance the stock in the rear to fit the mag box.
Did you get a center feed Wyatt’s or staggered? The feed rails on the action might need to be opened a little for the RUM case to feed well.
H1000/Retumbo and the 215s is where I’d start!
 
Cahunter I bought The Wyatt cfe 09 box. It’s center feed.
I’ll say something to the smith about the feed rails. He did tell me he has milled several actions for the 300 rum conversion without a hitch.
 
Speaking of reloading....
I read on the other post about Retumbo and H1000 being in short supply. I have some Retumbo on hand as that’s what I shoot in my 264 Win Mag’s.
However...
I live about 30-40 minutes away from Jeff Bartletts In Owensboro Kentucky.
Have any of you guys used any of his pull down powder in your 300 RUM with good results?
I see he has/had some H1000 type powder.
With his powder prices I could wear the factory barrel out fairly quickly.
Thanks
 
Love my RUM. I got lucky and picked up some VV570 and I run that behind Berger 210 & 215 bullets. Loads were good with RL26 but I got more speed with the 570.
 
Love my RUM. I got lucky and picked up some VV570 and I run that behind Berger 210 & 215 bullets. Loads were good with RL26 but I got more speed with the 570.
I have 9.5lbs of 570 and not sure if I am gonna keep testing or not? I get real good accuracy and decent velocity with h1000 and 215 berger. 90 grains and its sub .5moa 3070 fps. I tried the n570 with the 230 berger and I was disapointed in accuracy. My most accurate load was 86 grains which gave 2782 fps. I ran it all the way up to 92.5 grains which hit 3100 fps but not accurate. It turned a sub .5moa gun into a sloppy 1moa gun. I did have ok loads just over .5moa with velocities of 2882, 2918. The faster it went the loss of accuracy. I hit psi at 92 grains which was 3072fps. With retumbo I load 90 grains and get 3020 fps and accurate so I dont think I will continue with 570. The other thing I really do not like about the 570 is how black it fouls the barrel with graphite. It is hard to get them clean with wipeout and accelerator. There must be a better solution for cleaning barrels that run n570.
 
Do you guys see anything below that you would like to see used in the 300 RUM?

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BR-2 Just received. Brand new, current production, manufactured by Lovex, in Czechoslovakia.
This is a double-based ball type powder, ideal for many pistol calibers.. Meters very
consistently, and burns extremely clean. Very similar to Accurate #2 and Scot 453. Use
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charging easily detectable. Excellent choice for 12 gauge target loads.
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BR-5 Recently acquired. Brand new, current production. This is a double-based ball
type powder, originally intended for 9x19mm ammo. Meters very consistently.
Burning rate is similar to Hercules Unique, which data can be used. Additional
data available on request. Clean burning with consistent results.
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$95/6# jug TEMPORARILY OUT OF STOCK


SMP842 This powder, SMP842 is sometimes called WC842. It is a double based (spherical) ball powder,
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WC844 Original application is U.S. 5.56mm NATO (.223 Rem) Ball M193 (55gr) & M855 (62gr),
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WC846 Original application is U.S. 7.62mm NATO Ball M80 and Tracer M62,
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can be loaded using Hodgdon BL-C(2) data or Accurate Arms 2460.
Recent pulldown clean and fresh. Burn rates can vary dramatically
from lot to lot. ALWAYS BEGIN WITH STARTING LOADS!
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$109/8# jug


Reloader This is the military version of Alliant Reloder 15, used to load the 7.62mm NATO Special Ball
15 M118 LR round. Slightly slower in burning rate compared to IMR4895, it is an excellent choice
for loading .30-06 ammo that is compatible with the M1 Garand gas system.
Recent pulldown powder in superb condition. Burn rates can vary dramatically from lot to lot.
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IMR7383 This is a slow burning stick powder originally used for the Cal. .50
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the .50 Browning Machine Gun cartridge. This powder is NOT recommended
for the .50 BMG round. It is a very bulky, single-based powder, composed
of 85% nitrocellulose and 15% stabilizers, flash inhibitors and graphite;
that was developed to replace the IMR4831 powder that was being used.
It has about the same propellant energy as IMR4831 when compared in equal
volume. IMR4831 data can be used. Begin with starting loads, reduced 15%
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$65/7# jug


WC857 New item. A slow burning ball type powder developed for the .50BMG tracer
ammo. This powder burns faster than the typical WC860 thru WC872 series of
powders. This powder has not been released as a canister powder. Loads can
be worked up using H-870 or AA-8700 data, less 10%. Burning rate seems to be
similar to Hodgdon H1000 or Reloder 25. An excellent choice for the .300 Win Mag,
7mm Mag, and other magnum type calibers. Good results in .25-06 with heavy bullets.
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from lot to lot. ALWAYS BEGIN WITH STARTING LOADS!
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WC860 Original application is U.S. .50 Cal. BMG ammo, used for the Ball
M33 and API M8 projectile. A ball powder which can be loaded using
Hodgdon H870 or AA8700 data. Just received a limited supply.
This is pulldown ball powder from Lake City. Burn rates can vary
dramatically from lot to lot. ALWAYS BEGIN WITH STARTING LOADS!
$60/8# jug; $330/6-8# jugs ($55/jug)


WC872 Original application is U.S. 20mm Vulcan ammo. A ball powder which
can be loaded using Hodgdon H870 or AA8700 data.
Ideal for .50 BMG and other large capacity magnums. Burn rates can vary
dramatically from lot to lot. ALWAYS BEGIN WITH STARTING LOADS!
This is pulldown ball powder.
$55/8# jug; $300/6-8# jugs ($50/jug)


Hodgdon Brand new, recently purchased and unopened. Lot # 81217122105
Hybrid 3-8 lb jugs
100V $150 per 8# jug

Hodgdon Brand new, recently purchased and unopened. Have four (3) 8# jugs available.
H4350 One (1) of lot 5593. Two (2) jugs are lot 5745
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Alliant Brand new, recently purchased and unopened. Have three (3) 5-pound jugs.
Reloder All same lot number: 85081X040519
22 $$105 per 5# jug

Vihtahuori Brand new, recently purchased and unopened. Have nine (6) 1-pound bottles.
N160 All same lot number: 03.10.2017
$28 per 1 pound bottle or $150 for all six







Jeff Bartlett
1309 W. 9th St. • Owensboro, KY 42301

(270) 685-2432 or (800) 714-6348
FAX: (270) 684-6249



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Part 2
Today I picked up my barreled action from the gunsmith.
He fitted the barrel to the trued action and head spaced. Threaded the barrel and installed a Ross Schuler brake. Bead blasted the barrel. Cerakoted the action. Milled the action and fitted the Wyatt 4” box magazine. Lapped the lugs.
$340.00 out the door.
I got it home and found the box magazine would not drop in. Expected.
Relief cut the Remington Tupperware stock for the magazine box with my die grinder. She fits snug.
My question is how snug or loose should the magazine box fit?
Tomorrow I’m going to install the trigger and bolt stop onto the action.
then fiddle with the magazine box and stock fit.
I read you don’t want the box to tight or to loose.
Thoughts?
 
The box should have some space in the stock. It shouldn’t bottom out either. Have had to shorten a few boxes to keep them from binding when assembled in a stock.
 
I got it in and all appears well. I don’t have any live rounds to check the feeding. I got to get some brass. I have driven to five different gun shops looking to buy a box of factory ammo and no one has any 300 rum.
I got the rifle all together and she looks deadly. Got new scope rings coming along with brass next week.
Will report back with feeding and range results asap.
 
Good news I found some ammo and loaded the magazine box with two rounds. They load and feed great. Feeding/cycling is perfect.
Now onto load development.
 
Got the scope mounted and bore sighted today. While I was at it I weighed her up and she is 9.5 pounds.
Got bullets arriving tomorrow and hopefully the brass will be here on Saturday.
I’m ready to get some lead down range.
 
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