Remington 300 Ultra Mag

[bearpaw]

I totally see what your saying.. my OAL length I think is almost identical to yours.. 3.7.. magizine is a bit shorter. BUT.. I think this is pretty common across ALL factory rifles.. they have to live up to SAMMI specs, as making a rifle that shoots bullets well seated in the lands can cause excessive presure. Plus they need to feed properly

MAYBE.. there is an aftermarket magazine that will let you go to the full lengh?

I am thinking about gettng the HS Precision Detachable magazine.. perhaps that will come with a longer OAL?

Just curious, Do you know how many cartridges the detachable holds?

[MDGrand]

I dont have a Sendero.. but I think the twist rate is the same, 1:10 as my XCR II in 300 RUM.

For a 200 Grain TTSX:

Federal Nickle plated brass, CCI LRM, RL 25 88 grains, OAL 3.64

[MDGrand]

I totally see what your saying.. my OAL length I think is almost identical to yours.. 3.7.. magizine is a bit shorter. BUT.. I think this is pretty common across ALL factory rifles.. they have to live up to SAMMI specs, as making a rifle that shoots bullets well seated in the lands can cause excessive presure. Plus they need to feed properly

MAYBE.. there is an aftermarket magazine that will let you go to the full lengh?

I am thinking about gettng the HS Precision Detachable magazine.. perhaps that will come with a longer OAL?

Just curious, Do you know how many cartridges the detachable holds?

It holds 3.. EXPENSIVE THOUGH!

http://www.midwayusa.com/viewProduct/?productNumber=457891

[whacker1]

http://www.hsprecision.com/shop/detachable-magazines

3 round.  

you basically are taking out the trigger guard and hinged floor plate to put in a solid piece that allows for the detachable magazine.  I don't believe it gives you any longer options for the COAL.  It would be worth a call or e-mail to find out.  It is a $300 change by the time you ship and pay tax.  

[bearpaw]

Yes that is spendy... I will have to think about that one. 

Thanks for your input on the load too. 

[Jeremiah P]

102 grains of retumbo, be careful it is a very compressed load, and my buddy says its not fun to shoot

I shoot the sendero and it is amazing with 208's, but I also load 180 accubonds for my buddies RUM and it also drives tacks. The 180 load is hot moving just over 3600 So far my gun is accurate out to 1250 yards with me shooting it

I was curious about trying to work up to the load you are referring to, would you mind sharing your recipe for this load? THANKS

[Jeremiah P]

I have never chrono'd the load but thats what he told me he was getting. All I know is that my 208 shoots better at long range than the 180's and has less drop.

[high country]

I have shot 110 grs of 8700 for years. I am 200 fps behind you.....verified through the lights.

[MDGrand]

Yes that is spendy... I will have to think about that one. 

Thanks for your input on the load too. 

Hey Dale.. Here are the results from my 200 TTSX Load:
Again, the recipe: Federal Nickel plated Brass (I only have this because I went through a box) 200 Grain TTSX, OAL = 3.64 (this is seated -0.02 off the lands so this may be different for your load), RL 25, 88 grains (this is max), CCI LRM, Rem 700 XCR II, 26" barrel = 3150 FPS. BC on this bullet is 0.546 too.. so should be a super nice accurate load out to 500 yards.

If you have a sendero with a heavier barrel, you will probably get even better results. Good luck.

[bearpaw]

MDGrand, That's really good shooting, I will have to try working up to that load when the weather warms up. My gun does have the heavy barrel, but I doubt i can shoot much less than 1" groups because I am not the best shot. It's a gun I bought from a guy who needed money, it's in great shape and it shoots really good, I have seen several targets. I have not shot this gun yet myself, but I want to work up some Barnes TTSX loads for it.

Have you shot any of the lighter TTSX bullets?

[MDGrand]

Thanks, Dale.

In all fairness, this was done off a nice bench rest with front and rear supports, there is little I had to do. When working up the load I try to make sure I find out what the RIFLE can do with a load first, then I find out what I can do with it. There is no need to shoot MOA groups off hand or free hand in order to get a nice clean kill shot on an animal.. as they say, if you can hit a pie plate at 100 yards that is usually good enough. So I practice off hand and more field type shooting positions at the range after I find my good loads.

The Sendero though is a flat out nice rifle.. top of the line from Remington from what I understand. That should shoot 1 MOA all day!

I have not shot any lighter Barnes TTSX bullets out of my 300 RUM, albeit the TSX 180 federal factory ammunition I got the brass from. For a 300 RUM, I try to shoot the biggest bullet I can find with the best BC. If can shoot damn near or over 3000 fps with a 200 grain bullet and the bullet has a BC of over 5.. that means the bullet is gonna have a nice flat trajectory and be real wind resistent.

[Jeremiah P]

My 208 Amax bullets have a BC of .648, pretty hard to beat that BC.

[Antlershed]

Remington Sendero. Mine is a twin to Jeremiah's. I'm also shooting the 208's

[bow-n-head]

I have shot 3 different 300RUM's and they were all tack drivers. didn't seem to matter what bullet we tried. I would like to caution anyone trying to get excessive speed from a gun. I know from experience it is not worth ruining a gun for.

[bobcat]

I agree with using the heavier bullets. In a conventional bullet such as the Nosler Accubond I'd go with the 200 grain and the high BC that goes with it. With a Barnes I'd go a little lighter- down to 180's but not any lighter. If you want to shoot lighter than 180's you might as well be using a standard 300 Win Mag or a 30-06. Just my opinion.