Remington 300 Ultra Mag

[CementFinisher]

I run DoubleTap Ammunition 180 Grain Nosler AccuBond Spitzer's, 3325 fps at the muzzel. need to get some new dies, damm stuf is expensive.

[high country]

I have a lot of load development with the 300 rum under my belt and have built or bought 4 different rifles in the cal...if you are driving a 180 to much over 3400 legitimate fps through a chronograph.....you are asking for trouble.the diff in pressure from 3300 to 3600 is enough to make you blind if you live through a case failure. There is no reason to push 80k cup.....not worth the risk.

[MtnMuley]

What's your opinion on the 175 gr. berger at just over 3450fps?   No signs of pressures and it's not a compressed load. 

[bearpaw]

I have a lot of load development with the 300 rum under my belt and have built or bought 4 different rifles in the cal...if you are driving a 180 to much over 3400 legitimate fps through a chronograph.....you are asking for trouble.the diff in pressure from 3300 to 3600 is enough to make you blind if you live through a case failure. There is no reason to push 80k cup.....not worth the risk.

I am trying to figure out how Jeremiah P can get that kind of speed, I don't see the data anywhere on how to accomplish that. Rather than suggest he is wrong, I was hoping he would share his recipe. We also have a couple 30/378's and we can't get that much speed out of them with a 180 gr either.  

[high country]

I can't give any advice on the berger as I have done my testing with scirocco, tsx, xlc, and asst sierras.  I have made 3400 using 8700 with 180's at about 110 grs, which is closer to 65 k. The problem with pressure signs in high cup cases is they are built tougher, but once you start to flow brass.....you are on the brink of disaster. When you flow a low cup case, there is a lot less chance of it going tragically wrong...but still dangerous.

[bearpaw]

We like the performance of barnes and especially the tipped tsx, I do think they will shoot a little faster and do create less pressure than other bullets, but we still can't the speed he is talking?  I don't want to discount the possibility, rather I would love to hear how he is getting 3600 from any 180. 

[high country]

I have a lot of load development with the 300 rum under my belt and have built or bought 4 different rifles in the cal...if you are driving a 180 to much over 3400 legitimate fps through a chronograph.....you are asking for trouble.the diff in pressure from 3300 to 3600 is enough to make you blind if you live through a case failure. There is no reason to push 80k cup.....not worth the risk.

I am trying to figure out how Jeremiah P can get that kind of speed, I don't see the data anywhere on how to accomplish that. Rather than suggest he is wrong, I was hoping he would share his recipe. We also have a couple 30/378's and we can't get that much speed out of them with a 180 gr either.   

and that is a 133 gr case of better quality. I suspect a guess on speed.

[MDGrand]

I chose the Model 700 300 RUM, XCR II.

So far, I really like the rifle. It is a heavy kicker and I have to learn how to shoot it a bit more to get the accuracy I want out of it. But, I do get sub MOA groups with the following loads:

180 grain Barnes TSX Federal Factory

and

210 Berger VLD's, RL 25, 87.9 grains, CCI LRM Primer, OAL 3.54 = 2950 fps, 0.63 BC

Going to try:

200 Barnes TTSX, RL 25, 88 grains, CCI LRM Primer, OAL = 3.6 = 3000+ fps, 0.53 BC

Two thoughts with this rifle...

If getting a Rem 700 synthetic stock that is NOT a sendero line, get an aftermarket stock, I got an HS Precision. The factory stocks suck unless you go with the Sendero line, those come with B&C stocks.

[Big P]

I'm shooting a model 700:

180gr nosler ballistic tips
92gr reloader 25
federal #215 primers

3309fps @ the muzzle

[haugenna]

3600 FPS with a 180 is false info from your buddy.  If he did, the pressure is dangerous and a slight variation in the ambient air temperature could cause a world of hurt.

[haugenna]

I have a lot of load development with the 300 rum under my belt and have built or bought 4 different rifles in the cal...if you are driving a 180 to much over 3400 legitimate fps through a chronograph.....you are asking for trouble.the diff in pressure from 3300 to 3600 is enough to make you blind if you live through a case failure. There is no reason to push 80k cup.....not worth the risk.

I am trying to figure out how Jeremiah P can get that kind of speed, I don't see the data anywhere on how to accomplish that. Rather than suggest he is wrong, I was hoping he would share his recipe. We also have a couple 30/378's and we can't get that much speed out of them with a 180 gr either.   

and that is a 133 gr case of better quality. I suspect a guess on speed.

I will never own another 30-378 after reloading for a RUM.  I used 110 grains of retumbo and got a 180 moving 3350 fps.  I loaded 100.2 grains of Retumbo in a 300 RUM and got the same 180 moving 3480.  More efficient with less powder.

[MDGrand]

That is a TON of charge for a 180 grain bullet. Is that even recommended max spec with Retumbo? That sounds like a compressed load to me. I have seen Retumbo used into the 90s on some bullets but 110 grains! Wow.

[dontgetcrabs]

That is a TON of charge for a 180 grain bullet. Is that even recommended max spec with Retumbo? That sounds like a compressed load to me. I have seen Retumbo used into the 90s on some bullets but 110 grains! Wow.

I think he was loading 110 gns in a 30-378 and 100 gns in the RUM.

[MDGrand]

I see.. STILL.. 100 grains for a RUM and 180 bullet?.. that seems like a lot.

[bobcat]

From Hodgdon's online data:

Cartridge:  300 Remington Ultra Mag
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Bullet Weight (Gr.) Manufacturer Powder Bullet Diam. C.O.L. Grs. Vel. (ft/s) Pressure Grs. Vel. (ft/s) Pressure      

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180 GR. SPR SPBT  Hodgdon  Retumbo  .308"  3.530"  94.0  3182  58,400 PSI  100.5C  3300  62,400 PSI