The Jeffery has a rebated rim, it's smaller in diameter than the big WBY, Lapua or Rigby rim so it actually produces "less" bolt thrust when operating at the same pressure, .575" I think it measures. The Gibbs/CheyTac case rim is just way too big though. Another plus for the Jeffery case.
Have you ever had any problems with the 300gr SMK bullets being oversize and chambering in a tight freebore? You said .0002 over bullet diameter; I assume you measure the bullets and don't just figure they'll be .338 when specing the reamers?
All the 300's my brother has bought have been at least .3385, most all are usually about .3388 though. They throated his after reaming the chamber, so they had problems using the .3385 freebore/throater with the oversize bullets and getting the OAL right, as the bullet would give a false reading it was so tight.
Maybe I'll try some Retumbo and RL25 in his rifle for him while he's gone working in Nome this summer. Hmmmm, maybe I'll get very attached to it by hunting season this fall and just use it instead of my 300 Ultra. Heck, maybe I'll just use his 500 Jeffery and some AMAX's! Oh the choices I'm gonna have this fall. [img]images/icons/grin.gif[/img]
I think you'll get 3000-3100 fps pretty easy based on what he gets from his, and be pretty easy on brass too.
I had a 30-378 built in '79 with a 30" douglas s/s bull barrel, on a Ruger #3 action with Canjar trigger and Fagen wood. I used a 24X leupold at first and then a 5.5-22 Nightforce. This rifle was bedded with glass and I tried several different tuning methods to tighten groups more. I built it to hunt with more than target shoot. I have used several powders as listed.
WC-860 AND WC872. I mostly shot 200 and up to the 240's. Little time spent with lighter weight bullets. Shot a cotote in AZ with a 150 Win silver tip pulled from 30-30 ammo at about 3600 fps. Brown furr and red mist. Using the 200 gr. Sierra Matchkings shot several deer and a couple of elk out to about 700 yds. This chamber had little freebore and the 200 grs can touch the lands when the breech was closed. Max loads were as follows: 180 gr = 3550,
200 = 3350, and 220 = 3150, with the 240 limited work was done but about 3050. The Lieca 1200 works well and I have used it to a little over 1000 yds, but the beam is large at that distance. We found by ranging cattle and sheep with several laser rangefinders and a Wild rangefinder that if we aimed the Lieca at thier feet we got closer to real numbers. Can anyone comment on that thought that beam divergance is too great and you actually get a reading back from the ground beyond the animal??
Thanks for your time,
This post was started in Jan. of 2002
I have the 30-378 in a Nesika action and a Kreiger barrel smithed by Howard Wolfe.
Your points are well taken and I would maybe go in a different direction also but it is too late for this project, I have been using this gun to kill elk for the past two years.
I have learned a lot about long range, my shooting skills, and trying to find the right powder for this large case. It has been fun. I will never look back to what I could have done only ahead to what to do next!
Big bommers are addicting to say the least.
It is fun to shoot and just plain insane to hit steel ground hogs out past 1K fairly consistently.
When I get ready to rebarrel I will be looking into the 30 Wolf. I have a good Nesika action and I know more about reloading and the importance of top quality brass than I did when I started this project.
I wish you luck with your new gun but you don't need luck you have picked a great setup and only time will tell.
Keep us informed of your project and post some pixs when you can.
I hane had a 30-378 and I have tasted quite a bit. It was built in 1980 and had a no freebore. It wasuilt on a Ruger #3 action with a 30" Douglas barrel. Canjar trigger, Fagen wood and several different tuning fore3arm setups.It can do 3400 with heavy loads in 200 grs,m and 3550 in 180 gr. 220 at 3250 and 240 at 3150 fps. I fyou want I can send you info on loads. E-mail me @ email@example.com
Cam, for what it's worth, I've worked up loads from Barnes using the new TSX 180 (only) and Retumbo. I've worked up to and over the max load listed in the Barnes new book. The farthest I've been abel to shoot is 300yds but the groups were awesome for me and teh rifle. It best group was 2 1/8" at that range. It chronos real fast at over 3600+ fps. I did get it to over 3700 but the bolt was starting to stick at 114gr. Yes I was freaked, but there are no abnormal pressure signs. I backed off to pub max of 113 and load the TSX to the last driving band. My rifle is starting alot of freebore. I have not tried 200gr, but I have used AA8700 with good success too. Velocity at 2g over max was 3375fps with still no extraction problems. I chose to consult teh Weatherbyman.com for load data and info. All this was with a 4.5x14 Leupold VXIII. Chrono was accurate too because I verified it with my other long-range handgun '06 and 338'06 loads. [img]images/icons/shocked.gif[/img]