I'm trying to decide between the 285gr grandslam or 300gr partition in my 375 ultra mag.How does the grandslam in 375 hold up at 2900fps-2950?I know what the nosler will do just curious about the grand slam.In effect on game I wasn't happy with the 270gr x bullet at 3080fps just punched right through moose.

Griz,

Did the 'X' not expand? Did you loose the moose?

Consider the Swift A-Frame or the North Fork. I've used the A-Frames for years, and never had one 'pencil' through an animal. Perfect mushrooms and 95% or better weight retention every time.

George

Griz,
Noslers driven within their design parameters will do what they say they will do every time. They aren't super bullets. They just do what they say they will, every time, period.

Rusty
We band of brothers.

No I did get the moose and he didn't go far ,the x just went through ,it did expand but didn't cause the internal damage like the explosive front core on the partition.I like a little more expansion from my bullets I'm sure on a bigger moose the x would have been better.Just curious as to experiences people have had with the grandslam!

I would be curious what people have to say about this. Unfortunately, you will likely get alot more, "do this or that," than answers to your questions. Alot more advise than information, usually...

I just bought some Nitrex ammo with the Grand Slams for a 375 H&H. I would characterize the GS as about mid-way between the Partition and the X in terms of expansion. This is based on 30 caliber bullets, though. I would also say that the GS is more prone to "failure" than the Partition. This is based on my perception and limited experience with the bullets. No concrete date to back this up.

If I were shooting a hot 375 then I would only use the NorthFork bullets, they expand quick and big and never come apart...

Gentlemen,
I have shot the 285 grain Grand Slams out of the 375H&H extensively and at 2500 to 2550 fps it has worked wonders on plains game. I cannot give you my experience with them at 2900 fps however. The bullet was accurate, averaging 1.1" with a three shot group. I have shot game as small as steinbok to Livingstone eland with the Grand Slam and find their performance comparable to the Nosler Partition. I usually got a complete pass through on game like kudu, wildebeest and zebra. On the eland the bullet was lodged against the skin on the off side shoulder. I have never used them on dangerous heavy game. Prefer a 300 grain x-bullet, failsafe or solid. I have no doubt a Grand Slam would do the job if everything was perfect for a broadside shot. You just never know with buff what kind of shot will present itself. I think the Grand Slam would be perfect for lion and leopard. I tallied it up and I've shot 24 head of African plains game with the bullet. Just my $.02 worth!

I would say bwanamrm has it about right. If you're handloading, maybe try the Northfork's. You won't likely be dissapointed with the GS on thinner game. I would (and will) use something else on the biggest critters.

I would actually try the woodleigh 350 gr .375 projectiles that will cut velcoity but with the Ultra mag the bullet will still be doing respectable FPS and woodleighs are great bullets.

The 350 gr comes in a protected point style as well as a RN soft.

This is the way I would jump with the big capacity .375's

I would use the Grandslam. By all accounts the Grandslam is head and shoulder above the outdated partition.

I can't tell if you're joking or not, Judy

Please elaborate...

Run up to the African section and see the Grandslam that shed its jacket in a 375...

I'll take a partition any day, I have a box full of them that I recovered from game..Including some of the new 400 gr. 416s and that is without a doubt the best Buffalo bullet I have ever used, it knocks big holes in them, but I finally recovered 2 of them, but had to shoot a lot of Buff to get them. The Northforks are better on Herds as they stop on the off side skin every time and expand to the size of a washtub

first.. back them off to 2700....

next, if the X didn't open for ya, try a BT... it sure will.... (just kidding)

failsafe....

jeffe

Hi Griz,
If the X bullet just went right through and the Moose didn't go far what is the problem? I think you will find that the X bullet will do this due to it's design. They will penetrate up to 30 % deeper which leads to exits. The other thing you'll find is there is way less meat damage. I was always impressed with the fact that you could eat right up to the bullet hole with the X bullets. The only problem I've had is inconsistent accuracy with my rifles otherwise I would still be shooting them. If they shoot good in your rifle you have a good thing going for you.
Take care and good hunting,
Dave