Project Completed -- 375 RUM Defense Rifle Project Need Suggestions :)

Camp Cook said:
I work solo in very remote wilderness areas of British Columbia and having a rifle for defense use that can do everything that my Marlin 1895GS 45-70 can do and still be able to reach out to 400 yards for hunting is my goal.

I'm hoping I have done this with this rifle...


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I doubt you will have any issues in accomplishing your goal. I can already do that with my 20" barrel .375 Ruger , and you will have a bit more velocity to boot!:p
 
Here it is sorry about the lousy pic... :redface:

What I've done to it...

Glass bed & free float barreled action
Trigger adjusted to 4lbs
Kick-Eez recoil pad (installed after I took the pic)
NECG Masterpiece barrel band front sight ramp & red fiber optic sight post
XS Sights tall Weaver Ghost Ring backup sight
Leupold QRW bases
Burris 1X EER scope low QRW rings
Leupold VX3 2.5-8X B&C reticle med QRW rings
barrel shortened to 21"

All work done by myself or Guntech...

Can't remember if I mentioned this when I originally picked up the rifle the fellow that I got it from also gave me 3 boxes of 375RUM Rem factory 270gr Hornady RN loaded ammo I'm thinking that should be enough to get the ghost ring sight and both scopes sighted in.

Rem_700_LSS_375_RUM_Project_Rifle_003.jpg
 
Haven't had a chance to weigh it yet but it only had 5" of barrel removed and then the NECG front sight installed so it can't be much less than stock I'm guessing 3 - 4 ounces lighter.
 
Been messing around with the rifle this afternoon and decided that I would like a safety lever with a larger knob anyone no where to find one?
 
coenie said:
I am an African hunting guide and my choice for backup is a .375 RUM which I built on a Montana long action with Pacnor barrel. I use premium grade 380gr roundnose bullets with excellent results for dangerous game and 300 gr Barnes TSX for everything else. .375RUM burns a lot of powder and I would'nt shorten the barrel if I have choice.
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I really enjoy my 20" Ultra. It booms with authority to be sure, but it is not that disturbing sharp crack common to over bored small bores. About a hundred grains of powder seems to be a good balance for this bore size, the proof being that velocity changes only slightly with a reduction in barrel length. Recoil is manageable, even from prone. All in all there is nothing not to like in a well designed short .375 Ultra.

CC, from the pics it appears that your pistol grip crowds the trigger guard a bit, so you might want to put a grip adapter behind the guard to deflect your knuckle.
 
Boomer said:
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CC, from the pics it appears that your pistol grip crowds the trigger guard a bit, so you might want to put a grip adapter behind the guard to deflect your knuckle.
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Good advice.

I have a chunk of bone floating around in my knuckle from a short grip/trigger guard impact.

How ya keeping Boomer?:D
 
geologist said:
Are you going to put a barrel sling on it?
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No... no interest in that at this time its kind of weird I have never liked the look of them.

Just got back from the range this rifle definately recoils glad I had a Kick-Eez recoil pad on it.

I shot the rifle approximately 30 times but due to the amount of people at the range I didn't get the chronograph set up until the last 1/2 hour.

Right off I hit my first hitch @ 25 yards with the Rem factory 270gr Hornady RN bullets which averaged 2690fps I was hitting 13" - 14" high with the XS Sights tall Weaver backup rear ghost ring sight screwed all the way down.

I have a plastic front sight post that XS Sights supplies with their sight sets but it has a dovetail shape so I will have to grind it down to fit the NECG front sight base to figure out exactly the front sight height.

With the Leupold VX3 2.5-8X36mm B&C scope mounted I now have it sighted in 1" high @ 100 yards with 92grs IMR4350 300gr Gameking & Partition loads and due to how freaking windy it was today that is as far as I shot.

97grs RL22 with 300gr bullets gave me terrible consistancy jumping from 2598fps to 2758fps.

92grs IMR4350 with 300gr bullets was very consistant and averaged 2644fps and that is enough recoil so I am not going to increase the load...

Just for comparison in my 26" 375RUM 300gr bullets with 92gr IMR4350 gives me 2760fps appr 115fps loss with the 5" shorter barrel, 95grs gives me 2920fps and 97grs RL22 gives me 2800fps.

So far the gun is fun to shoot and other than the front sight height issue it is exactly what I was hoping it would be.

Oh and the trigger guard never hit my fingers so I'm ok with the stock configuration for now as well.


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I shot both the 26" & 21" 375RUM rifles yesterday to compare the only difference between them is barrel length/front sight and a larger 4.5-14X40mm scope on the longer rifle.

Yes the shorter rifle jumps more than the full length rifle was it quite a bit not really but it was enough for the top of the Butler Creek scope covers to just touch my forehead a couple of times.

edit to add; I did all of my shooting from a rest once I get everything sighted in I'll start free handing it.

I didn't notice any difference in recoil when I was shooting with the scope on or off with the ghost ring sight on.

I have several lbs of IMR4350 still and just bought a lbs of RL17 last week to try in both the short 375RUM and my 280 Rem any other powder types will have to wait for now but thanks for the thoughts on powder.

I have been looking but I have never seen the Hybrid 100V in stores but I have to stop buying more, I have close to my legal limit of powder sitting on the shelf now.
 
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This might help if you don't already have it. Might save you some powder.

Front Sight Height Calculator


Frequently a change in the rear sight of a rifle means a taller or shorter front sight is desired. Determining the desired height is a simple calculation that is explained below.

1.Shoot a group (at least three shots) with the current front sight. This can be done from any known distance. Convert the range to inches. (i.e. 100 yards is 36X100 or 3600 inches)

2.Measure the distance the center of the group is from the desired point of impact in inches.

3.Measure the distance from the front sight to the rear sight in inches. This is called the sight radius.

4.The change in height needed is calculated by multiplying the desired change from step 2 by the sight radius in step 3 and dividing by the range (in inches) that the group was fired at from step 1.

For example:

Let's say our rifle shot 10 inches high at 100 yards and the sight radius of our rifle is 23 inches. We can calculate the amount of change we need in the front sight as follows:

Change = 10 inches X 23 inches = .064 inches or about 1/16 of an inch.
3600 inches

Now to order a front sight the correct height, You measure the height of the front sight on your rifle from the bottom of the dovetail to the top of the sight, add the change calculated above and ask for that height. Use a caliper or micrometer to measure with since you need to have an answer in thousands of an inch.

It is important to note that front sights adjust the opposite direction you want to move the point of impact. In the example above we were shooting high so we needed a taller front sight. If we were shooting low we would want a shorter front sight.

Rear sights adjust in the direction we want the move the point of impact. If we want to move the point of impact to the left we move the rear sight to the left.
 
Excellent post that I am going to copy/save... :)

The front fiber optic post I have now is one of the lower ones .256" and my sight radius is 24 3/8".

I just got off the phone from Brownell's the fellow there just did this for me told me I would need a .415" - .430" front sight post they don't carry them this height though so I'm now checking out the NECG sight and see that they have a few this height.

But before I order anything I'm heading back to the gun club first chance I get I need to load a few more 300gr test rounds, I also ground down the plastic XS Sights test front post and installed it into the front sight base now wrapped a load of electricians tape around it so it doesn't fly off with my first shot.
 
Latest update due to the XS Sights tall backup ghost ring sight and NECG front post height combo hitting way to high @ any distance I have now been in contact with NECG about a taller front sight blade they are bringing one in from Germany where all of their sights are made should be 6 - 8 weeks for it to gets here.

It is a partridge blade with a red insert that is designed to be ground down to get to the perfect height.

I made my low weaver XS sights backup ghost ring sight to work with the front sight blade but my cheek is scrunched to hard into the stock due to it being a bit to low so it will work until I get the taller front sight blade.

I also ordered the tallest front fiber optic post from Brownell's maybe able to get the rear low Weaver ghost ring high enough to work a bit better and not scrunch my cheek so hard.

I was at the gun club yesterday with the Leupold 2.5-8X scope mounted on the rifle I had loaded up 5 260gr Accubonds with 95grs IMR4350 just to see what this load would do in the shorter rifle it averaged about 2890fps in my 26" 375RUM and 2820fps with a high of 2840fps and a low of 2798fps in this rifle.

The first 2 shots were touching at 100 yards and the third was about 1 1/2" to the right I adjusted the scope a bit due to these shots grouping low left, I shot the next 2 shots @ 200 yards they hit about 6" low.

Need to make up a few more loads I can't decide which combo to go with like a 300gr sighted in with the ghost ring sights and a 260gr sighted in for the scope or just shoot 300gr bullets oh well part of the fun of having a new rifle to play with... :D

One last thing this rifle kicks it is definately not something I would let a new shooter try, I wasn't really thinking on one shot I was pulled in tight at the rest with Butler Creek scope covers on the scope but flipped up during recoil the hinge knobs on the covers touched my forehead didn't break the skin but I felt it sting a little so I pulled the cover off and didn't have any issues after that.
 
I've had guys on this forum call BS when I said this happened to me. You really have to watch in sub zero temperatures as the Butler Creek plastic seems to stiffen enough to cut you. ..I guess most guys don't shoot at these recoil levels (and above).

Thanks for sharing the info on the sights as I was wanting a peep backup for the new 416 "Ultra". Should have my new 416 Barrel at any time....Can't wait to get it rolling. :D

So was I right about the jump???:D:D
That thing must be a beast sans the scope weight?
 
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