Hello, I am new to this page,
I have a 300UM in Model 700 BDL SS. I have had some work done to the gun. I had it free floated, and trigger adjusted to 2lbs from 7lbs. I need some advise and hopefully you could help me. Remington's customer support number won't help at all. I am trying to find out if my gun has a excessive throat. Specs say not to load the bullet longer than 3.6". With my Stoney point gauge, I find a very long length before I hit the lands. With Nosler PT, I measure an average of 3.755" before I hit the lands. With Speer Grand Slams 180g, I see 3.651" average. With 3.755", I won't be able to fit it in the mag and the bullet sticks out a ridicules amount.

1st question. If there is any loaders that load the 300 right off the lands, what is your COL with these bullets. Is it over 3.6". And if it is, does it fit in your magazine?
2nd question: Do you think that my throat is a little excessive? With factory ammo, my groups are around 2" and their COL is 3.575". If I load to 3.6" with Speer GS, I can get it down to 1" so I believe it is a seating issue.
3rd question: Is there anything on the ultra mag throats that would tell me not to load close to the lands. In other words, do you know if this gun is freebored like a weatherby gun? I have seen what can happen to a 300 weatherby if you load a bullet right up the lands. Gun don't shoot no more but no one got hurt. I figured, if the magazine length is the only thing that won't let me load closer to the lands then while target shooting, I just load one at a time. And for hunting rounds, make a little shorter and figure on the accuracy difference.

If you can help me any at all, I would appreciate it. I have struggled for information from the various companies, and Remington won't help at all. They keep going on with this jazz, that it is propietary. I really regret getting this gun. The other companies seem to be more helpful.

Thanks,
BC

Since this is a hunting rifle,you should never consider an OAL that will not feed reliably through the mag with a given bullet shape. In my 300RUM( box stock except for a jewell trigger and some steel bedding) I use factory rounds,the 180gr Sierra HPBT,180 gr Woodleigh or Sierra 180gr SPBT over 93-99 grs of Rl-25, with Fed 215 primers. I tried H4831,Rl-22,H1000 etc. and RL-25 gave the highest velocities and consistently the best accuracy with 180 gr weight bullets. The bullets are seated out till they can just feed through the mag without hanging up. I think, my OAL was about 3.625, max. I wouldn't bother even trying to seat them to 0.03 from the lands. OAL is different with each bullet. Yes the factory throat appears a bit long in my rifle, also, but accuracy is nothing short of phenomenal. Factory 180gr Nosler Partions shoot .75 inches and the 180gr Sierra's <.5 inches both loads are just short of 3300 fps in my rifle. Rl-25 really seems to be the powder of choice in this rifle with a 26 inch barrel. As I've stated before, the 300 Rum needs a 28-30 inch barrel for max velocity, but for a hunting rifle there is a practical limit. One of these days I'm going to build a Ruger #1 or Browning High Wall with a 30 inch tube in 300 RUM and I'll bet it will exceed 30-378 velocities with the 180grs bullets. While I have no direct experience with it, I'm told that Sierra 200 gr RN bullets shoot really well in this rifle. By the way, I used the 300 Rum in Africa recently and It hits really hard and Kills everything real dead. No flies on this cartridge except it has more potential than is practical for Remington. The only negative I've found is that under recoil the bullet noses get really flattened when kept in the magazine. I had to put fresh ones in every once in awhile. I saw Saeed's results on the 300 Rum and its amazing what it will do with 165 gr. bullets.

bigcountry,

Welcome to the forum,

We had a Remington 700 Sendero in 300 Ultra, and we loaded all our test ammo to 3.600"..

There was no problem with accuracy at all.

Have a look at this data on our reloading section.

www.accuratereloading.com/300rum.html

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saeed@ emirates.net.ae

www.accuratereloading.com

i have the same gun as yours and will tell ya there is no use worrying about it.

Thanks guys for the replys. Eric, when you say, no need to worry about it. Do you mean, no need to worry about accuracy, no need to worry about pressure. No need to worry about excessive throat. What do you mean? I went to a gun store and was able to measure there thoats of 300UM in same model. Thiers was alot better than mine. I measured 3.64" on two guns. I don't know about you guys but 1/10" difference in freebore can make alot of difference in accuacy. Like you Eric and Saeed, I have several friends that has the 300UM that shoots outstanding. We have swapped guns they got simular results as I did with accuacy. So I figure I got screwed and got a gun that was on the edge of there specs. Maybe I got the wrong gun for what I wanted. I wanted a gun with long range flattness, that I could use for on game from elk to bear plus also make up loads for targets for accuracy. Shooting is a hobby for me, so I spend more time at the range than I do in the woods. So if the thoat is excessive, I was going to send back to remington, while they will still look at it. With my COL at 3.62", I got 2 groups with 1MOA accurcy this weekend. I am still trying to find the right charge. The gun got real coppered up after 10 shots, and started to shoot 2.5" groups after that. I may have got lucky, or the gun needed cleaned. Maybe I am expecting too much out of this gun. But I shoot others and get consistent 3/4" groups and they are able to seat thier bullets 20/1000" away from the rifling going over Max COL only by a little.

Thanks
BC

[This message has been edited by bigcountry (edited 10-01-2001).]

shooting sierra gamekings of 150 or 165 i cant reach the rifilings without the bullet falling out of the case i can reach it with the 180s but it wont fit the magazine.i load everything to 3.625.the 150s shoot 3611 fps in .5 groups with 96 gr RL22 the 165s go 3400 in .65 groups with 93 gr RL22.the 180s go 3350 in .75 groups with 95 grs RL25.
thats from the 700 BDLSS with 3.5 to 10x50 leupold a shilen trigger set at just under 2 lbs over a Hart pedastal rest,and through a cheap shooting chrony.
try loading them to fit the mag. with different powder charges.if your loading out real close with max charges you could be too hot causing fliers.
i aint seen one yet that wouldnt shoot pretty good but it aint a target rifle.

where is turkey creek, ky.any big deer up there you need killing?

Eric, thats the accuacy I am looking for. Thats outstanding. Thats kinda what I expected when buying this gun. But when I measured that thoat with Noslers PT 180g and got 3.755" I was shocked. I always like to load 2/100" from the rifleing. Some of my friends like to go 5/1000" from it but I cannot seat that consistent and most of them are long range varmit shooters. Now you say, you can easily reach the rifling. I might have remington look at it. I have always had good luck out the 700 rifles, especially out of a super accuate 7mm Rem Mag I got but this 300UM got me discouraged. Do you shoot with a brake? Alot of my friends that have good luck have had theres ported and the gun doesn't jump .5". Mine does a little. I have been fighting not to put some sort of muzzlebrake on it, but I see alot of people have good luck with them controling jump. I don't mind the recoil that much. Its hard to test out loads when the guns get coppered up quickly also. Thanks for the data. Those results is what I am shooting for (pun intended).

bigcountry,

If Remington by chance doesn't do anything for you or your rifle, consider another alternative. You can find a gunsmith with a reamer that has a shorter throat, often marked "match". Have him (or her) set the barrel back 2 threads and re-cut the chamber.

I think that what you find is that the .300 RUM will start to shoot good with the loadings off the lands not into the lands. It does not seem to respond like a benchrest rifle does with the bullets into the lands.

Let me know if you need more.

Bill

try the sierras and watch your gun magicaly shoot better.the noslers are super good hunting bullets but aint known for one hole groups.what are you doing with your gun.if your deer hunting then the sierras are fine,and way yonder more accurate.