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Problems getting a tight group on my 300 Rem. Ultra Mag

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Unread 09-17-2008, 07:11 PM
Silver Member
Join Date: Feb 2008
Location: Franklin,id
Posts: 252
Re: Problems getting a tight group on my 300 Rem. Ultra Mag

Originally Posted by royinidaho View Post
Don't know if these suggestions will help but they can't hurt.

First free float that barrel. Take those two pressure points off flush with the surrounding wood. Seal these later.

Next take 5 one-dollar bills. Stack 'em and grip the ends. Slide them from the down the barrel channel all the way to the recoil lug. They should slide very easily and together.

If they don't remove wood from the appropriate spots.

After this is completed and the rifle is fully assembled, hold the rifle vertically with on hand around the barrel and fore arm gripping firmly the butt is on the bench. With your other hand and proper tool, alternately loosen and tighten both receiver mounting screws. If you feel movement between barrel and stock with the hand holding the gun, have it bedded.

You seem thoro and particular so I'd recommend pillar and skim bedding if bedding is indicated as necessary. For the intended use of the rifle, I'd have it pillar and skim bedded as a matter of course.

Another indication would be if your receiver mounting screws cinch up "all of a sudden" or torque down with several turns. My thoughts are that they should cinch up quite quickly. If they do you a good fit between wood and metal is indicated. If not the action is being squished into the stock which is usually not a good thing.

After the above it would be a myriad of variables to test. Bullets, powder, primer, seating depth, an on and on and on........

If would have been nicer if the groups were stringing in a particular direction. Symmetrical groups that size at 100 yds are a bit worrisome.
These are the 1st things I would be doing and checking. Sound advise.;) I would personally have a .1 gap between the barrel and a tuppeware stock.
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Unread 09-18-2008, 07:50 PM
Platinum Member
Join Date: Jan 2005
Location: OK
Posts: 2,133
Re: Problems getting a tight group on my 300 Rem. Ultra Mag

My load with the 300 rum is 210 berger on 89 grains of H1000, Winchester mag primer.

This shoots 3/4" groups at 300 yards. Pic of the gun is on my homepage.

Best I can suggest is send the gun off and have a new barrel put on. Your going to spend more time and money in components than what the barrel job will cost, and all you will have to show for it is frustration and a bunch of piss poor targets.
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Unread 11-01-2008, 09:48 AM
Junior Member
Join Date: Nov 2008
Posts: 1
Re: Problems getting a tight group on my 300 Rem. Ultra Mag

Originally Posted by bowhunter1001 View Post
I am only shooting about 1 3/4" groups at best at 100 yrds. I've had the gun shecked by Remmington and they say it is within specifications. I have the model 700 SPS. I've tried custom loads and we are still working on them. Other than trying different loads is there anything else I can do to help with accuracy?

Does anyone have a load they would share with me for this exact gun they like and that is accurate? Like out to 400-500 yards? I would like to be shooting 6" groups at this range.

I have shot rifle for years and I have a Remington 700 SPS in the 30-06 and I can shoot 3/4" groups with a factory load at 100 yards. So, I am very comfortable with the Rem. model 700 and very cofident with my 30-06.

The 300 R.U.M. is new and I went through a break-in barrel process (which was then trumped by a lapping process by the company). The gun used to shoot 2 1/2" groups at 100 yards (at best) and then the guys at Remington did do a little work, they recrowned the barral, lapped it and one other thing with the end of the barrel. They shot 1 1/2" in groups (I'm guessing in a lead sled).

Since the work done I have shot three groups of five shells. The worst group was 2 1/2" and the best was 2 1/8" (I kept my paper and just measured it). I had no wild shots...they could have all been coverd by a small circle. The factory loads (before the work was done) were Remington Premier Core-Lokt Ultra bonded 180 gr. bullets, power level III. I also tried the scirocco bullets (Same info. as above). My trigger has also been adjusted to 2.75 lbs.

The loads I shot after the work were hand loads. Rem. casing, Hodgeden powder (92.5 grains seemed to be the best) 208 grain Hornady A-Max bullets (not the best for hunting but great coefficient for accuracy). and Winchester mag. primers. I use a concrete bench with a small adjustable Caldwell rest for the front of the gun and a sandbag in back. I let the barrel cool between shots and I do my best to squeez the trigger and let the shot suprise me. I have a Leoupold Gold Ring 4.5 X 14 power scope on.

I know my groups are not as tight and that could be due to not having a lead sled but even with the factory 1.5" group I'm looking for tighter.

My next step is to have the barrel floated and look at bringing the bullet out further in the casing but I should be tighter at this point in time.

Can anyone help?
Well, I make custom rifles for a living. And Remington sends out rifles that have huge chambers and the rifling starts as much as 1/4 inch from the mouth of the case on one side and at the case mouth on the other side. I reset chambers for people all the time and often Rem bbls are not straight, often even egg shaped. Savage is making a much better product these days. Mike Allee GunsmithingOnly
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Unread 07-21-2011, 08:18 PM
Junior Member
Join Date: Jul 2011
Posts: 2
Re: Problems getting a tight group on my 300 Rem. Ultra Mag

Bowhunter 1001

I have aRem 700LSSLH 300rum with a syn stock and was having the same problems you are. I took a few step to fix the problem.
1) I floated the barrell
2) I torq. the action down to 28in lbs.
3) I use AA8700 powder at 101.4 grains.
4) Rem Brass,Fed 215 mag prmr
5) 200 gr. Sierra bullet.
6) prmr pocket swaged and trued,flash hole was trued with RCBs tool.
7) .780 groups consistly at 100 yards.

I hope this can help you out.
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Unread 07-22-2011, 11:38 PM
Platinum Member
Join Date: Jul 2011
Location: Pennsylvania
Posts: 1,638
Re: Problems getting a tight group on my 300 Rem. Ultra Mag

To throw my two cents in:

I may have missed it, however, did you have anyone else shoot the gun? Maybe it is you!

My current load for the 300 RUM Sendero SF is: 220gr SMK, 90gr H1000, Fed215M primers, remington cases and an OAL of 3.6850

Hope it helps!
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Unread 07-23-2011, 12:50 PM
Junior Member
Join Date: Jul 2011
Posts: 2
Re: Problems getting a tight group on my 300 Rem. Ultra Mag

I was only the shooter of my 700 LSSLH 300 RUM. I'm kind of a perfectionist when it comes to shooting any of my rilfes. I try to get 1moa or less with everything. I work up loads for all my rifles which is everything from a 5.56 to my 300 rum.
If I can't get what I want out of my rifle I'll bed,pillar,float it and use different brass,prmr's bullets and powder,plus I use uniformer tools for the prmr pocket and flash hole.
My current project is a Bronwing Bar 300wmag manufactured in Belguim. Having problems get it to shoot but its going to take time.
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Unread 07-24-2011, 11:36 PM
Gold Member
Join Date: Mar 2008
Posts: 569
Re: Problems getting a tight group on my 300 Rem. Ultra Mag

I just finished load development on my 7th factory rem 700 in 300 ultra. We bought 3 sps's on an incredible sale at cabelas. They shot so well we bought another one for my nephew and 2 of my friends bought them. We were able to get better than 3/4 moa out of all 6 of them with the 200 ab and h1000. and each of them between 90.5 and 91.5 gr. All at 3.650 oal. this last 1 I just did was for a friend it's an older lss that's been free floated but not bedded. this is been the most difficult 1 so far. but finally settled on 90 grains and had to play with overall length. with this powdercharge at 3.640 it shoots .75 . To .85
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