I just finished barrel break in on my new Rem 700. So I have been reviewing some notes and trying to work up loads in the book sorta speak rather than test them. I have 4 different tips I will be trying. And I currently have 2 different powders. The bullets I was working with are 150 gr accubonds, 168 A-max, 178 A-max, 180 accubonds. The powder I have right now are Retumbo and Rx22. I would appreciate your thoughts on the givien criteria and also maybe what else I should try or do different. Please by all means share you pet loads too.

I did a little reloading for the 300 RUM last fall - Retumbo worked pretty well with the 180 Swift Scirocco bullet, using a Federal 215 primer.

Does anyone else notice a monsterous muzzleflash with 180gr bullets and retumbo in the 96gr area? I mean I was shooting one day and every came by to watch it.

I was told when I started reloading this firebreather that 150 gr bullets were too light to be shot out of a 300 rum. I do not have any data to support this, nor can I remember the articles where I read it. But just thought I would share with you in case you have problems getting the 150's to shoot. 180's seem to be the lightest I've heard.

I shoot 180 Accubonds with 93 gr h-1000 seated to 3.59 Win Mag primers.

Both 180gr and 165gr ballistic tips are very accurate in my rifles with r-25.

I built a .30-378 Weatherby for a customer a few years back who had wonderful results with 150 grain bullets. I thought I would throw this out because this cartridge has even more case capacity than the .300 RUM. He used 150 OX bullets (Barnes X bullets coated with NP3) and a monstrous charge of Thunderbird - got groups in the 1/4" to 3/8" range at velocities that I am afraid to publish here for fear of being accused of fabricating facts. It did, however, have a 27" barrel and of course had a lot of muzzle blast. This gun has a trajectory almost off the charts - sight in 3" high at 100 yards and hold dead on out to 500 yards.

Wow, I don't blame ya for not posting those numbers. 3" high at 100 and zero at 500 with a .52BC bullet and 150gr would have to be launched at 4400fps. And thats if you have 2" scope hieght.

Very good . . . The actual velocity is 4080 - scope height is 2.1" - altitude is 8,000 - and the bullet is the Barnes XBT. Are you using Exbal? Should be about 3" low at 500 when zeroed 3" high at 100 . . .

HOW LONG DOES THIS GUY HAVE TO WAIT BETWEEN SHOTS?!?!?!?!?

The barrel is a 27" Hart #5 (1:12) - Cryo Frozen. It gets fairly hot after only three shots, but that doesn't seem to affect the accuracy. I know this sounds a little wacky - I didn't believe it either at first - had to shoot it over another chronograph to confirm. Apparently, the NP3 coating does some things with friction inside the barrel that regular moly can only dream of. I did read some stuff later about this coating that suggested that it will cut your barrel life by about 1/3 - which in the case of the .30-378, would make it about 500 rounds . . . .