For when I receive my .300 RUM, I would like to put a varmint load together for long distance groundhogs and maybe some coyotes. I am mostly looking at either the 125 grain Nosler ballistic tips or the 110 grain Hornady V-max, I especially prefer the 110 grain Hornady v-max due to the thinner jacket, but could I see the bullet come apart at .300 RUM velocities with a 1:10" twist? Also what powder would be the best for obtaining maximum velocity out of the lighter bullets, I would assume Retumbo would be too slow for the 110's or 125's. I am not interested in any of the Reloder powders, for they are greatly affected by temperature variation, so maybe one of Hodgdon's extreme powders? Let me know what you guys think!

Braxton

I think you're gonna fry that barrel.

well since you want to know what we think..

the 180 or 200 grain will shoot flatter at long range, and probly more accurate at all ranges.

buy a swift!

+1

They sell barrels everyday -that's how i see it..

Powders recommended by nosler for the 125 nbt -300rum loads are h-4350 ,h-4831 and h-1000 -so vitavouri powders in those rate of burn powders n-160 n-165.Velocity is in the 3700-3800fps range.

The 300rum has such a huge case capacity that as stated by others -will fry your barrel in about 800ish rounds.
Not to tell you your business but i'd look at the nosler 150gr ballistic tip.
3550-3600fps w/a 150nbt will be about the least fur friendly load a man could come up with for groundhogs/coyotes.
I'd bet that you could get surface type [although very big surface type wounds]wounds with the 110vmax w/a 1-10" twist.

I remember a guy posting pictures of a coyote he shot w/a 150nbt 300rum -pieces of coyote the size of your fist laying in a red funnel shape behind the dead coyote.The moderator took it off immediately -not here at the fire by the way-.
It was shot quartering away and the bullet exited starting at the back of the ribs to the brisket --right front leg and shoudler literally gone.
The 180nbt or 178amax will also hammer small critters.
Good luck -Mike

I started to write almost the same thing last night, but held my thoughts. I have had a .300 RUM since mid '99 and it is a master of big game with a 200 grain bullet. I have gone as light as 165 & 168's with white tail deer, which it make short order of them like a .22/250 on prairie dogs. I also think you might get about a good day or two of life out of the Ultra barrel if you to go out like as I have and fired all day long at a couple of dog towns. You may even have a danger from burning your hands on the barrel, mine is warm after one shot and down right hot after two in a couple of minutes. I would guess after 10 shots in 10 minutes the temp would be near boiling water. You might end up with a stock that looks like a 98 Mauser that my Uncle brought back from World War Two, the wood around barrel is lightly charred. Good luck in any case!
Good shooting,
Marcus.

I've seen pretty much the same or more extensive damage from my RUM on 'yotes too...Literally chopped one in half that trotted across a logging road in front of me while I was glassing for elk...165NBT hit him right at the last rib, full broadside. Half (more or less anyway) laying in one tire track, and half in the other, connected (loosely) by a string of intestine. Shot was only about 65 yards though.

168SMK's can do similiar things, although the performance can vary from shot to shot.