I have the 308 Baer, the 30 Goodling and my 300 DC Super IMp. which are all based on the Improved 300 Weatherby. As a matter of fact, they are all VERY close in measurments also.
I like the design of the 300 RUM case better then the Imp 300 Weatherby style cases.
So far, I am quite sure the 300 Tomahawk will outperform any of the 300 Weatheby Imp cases that I have.
I have taken the 240 gr 30 cal to 3168 FPS without any signs of pressure yet.
I end up with pressure signs after two loadings with any of the 30 Imp using much less powder and 220 gr bullets.
I am confident that 3200 to 3250 fps is within reach. I have quite a bit of powder volumn area to use yet. The 30 Weatherby IMP would not have held near as much as I have used so far in the Tomahawk. The cases have been loaded 3X in the Tomahawk.
As soon as the weather breaks here a bit, I will resume the testing as there are several people interesed in this.
For benchrest or excellent LR accuracy, the 1000 yard shooters eleminate the excessive freebore and try to get the bullet within .010" of the lands and sometimes into the lands softly. I know the Accumark is NOT a benchrest rifle but better accuracy can be gained from most of them.
Your Weatherby not only has the freebore but a magazine box that restricts the overall length of the loaded round. If you eleminate the "jump" of the bullet into the lands caused by the freebore, most Weatherbys shoot MUCH better. Try seating some heavier longer bullets out in the case neck further and see if it chambers. You may not be able to get to the rifling though and will have to make a measurement to see how far away you are. If 180gr is all you want to shoot, and at the range you want to shoot, stick with it.
Maybe you have an exceptional one that likes JUST the 180 gr bullets. For LR shooting the higher BC and heavier bullets are much more desirable to most.
My wife and I shoot at Williamsport with (4)---300 Weatherbys. Two in the 16 1/2 Lb class and two in the heavy benchrest class.
NO freebore EVER in ours. Our gunsmiths wouldn't chamber the freebore into them anyway.
THANK YOU for all your help. Sorry I have been busy at work and the Olympic stuff here. Mostly wanted to say THANK YOU! and report back. I talked to Ray Romain NICE GUY and I would not hesitate to have him work on any rifle. Also talked with Howard Wolfe his pet is the 30-378. To get to the point! I ordered a neiska action, Timney trigger, Howard has ordered a 32" kreiger barrel, and is going to piller and glass bed into my elkridge laminated stock. Keeping the weatherby as is for now.
Prime time I live in Utah, I just like the 30-378 and know the remington action is to small.
HoytemanPA good to know you have a 30-378 all I have loaded for is the 150's and the 180's I plan to load for the 200 MK's with the new gun and maybe the 220 MK's so not much help yet.
I feel like a beginner when it comes to reloading. Could just go by the book and load a accurate load for 100 yd's then go hunt. Things change! Need to get a chrony, rangefinder, etc. Also keep better data when working up a load. What do you guys keep track of when reloading?
The best powder for the 150's was RL-25 for the 180's was H-870. But not knowing the actual velosity drives me crazy need to save up again.
Any Info on the new powder Hodgdon RETUMBO is for large over bore's? also Leica 1200 rangefinder is out anybody tried one?
Thank you all again, very good Info on this board and lots of talent!
I'm just waiting now for all the parts and pieces to turn into my first custom.
Congrats on getting the custom built. The RL25 with 150's and 870 with 180's is consistent with others' favorites on other boards as well. I have been working up mainly the 220's with RL25 and H50BMG. With the H50 I am still a couple of grains shy of max listed on the hogden site and starting to show pressure signs (ejector marks). But it sure seems to like the load. Seems to be cleaner than the RL25 as well. The jury is still out on the RL25 I've got one more set of test loads before I give up on that powder.
Talk to ya later,
Hodgdon powder has a new powder for large overbores but they have some DOT issues their permits or something was in the World trade centers. The powder is called Retumbo might try this out when available?
I have the very first 30-378 Weatherby stock. It came from a rifle that was a contract item from the factory to the US Army ballistics lab in Huntsville, Alabama. The contract was for a single shot test fixture, 30 cal. that would project a solid aluminum 100 gr slug over 6000fps to do impact analysis on armor plate. The rifle was never fired by the army with the stock attached as the stock was removed and thrown in the trash. I got that stock before it went to trash disposal and now want to sell it. It has been sitting in my closet since the early '50s. Where would be a good place to advertise it for sale? Any help is appreciated. firstname.lastname@example.org 256-955-2746