300RUM Loads

kraky · #8 08-28-2006, 08:51 AM

Not trying to hijak the thread but what do you think?
A friend wanted to try some 168 tsx's. I loaded him 10 rounds with 98.5 retumbo and that was well below max according to hogdons' website. Now from the above info it looks like that might actually be a pretty stout load. I have read from others that later lots of retumbo seem hot.
He hasn't shot them yet......what do you guys think....should I "pull down the loads"??

waha · #9 08-28-2006, 11:20 AM

Should be okay. I get higher pressures with the TXS's than conventional gliding metal jacketed bullets but I think you are safe. Just FYI, I ran a test with one of my Ulra's with the 180 Scirocco and loaded them with Retumbo up to 105 before I got measureable case head expansion! The cases can take a lot of pressure. I shoot 102 grains of Retumbo with my 180's without any issues. But I would only work up to that degree with a micrometer and chronograph. I'm sure the 168's will be fine at that load. I read the thread last night also about Retumbo and couldn't beleive what I read about the pressure levels. I know its difficult when loading for others but I would reccomend borrowing their rifle and work up a half a dozen loads in 1 grain increment and verify pressures first hand and you will sleep a lot better.

kraky · #10 08-28-2006, 11:50 AM

It sure seems like there is lot's of conflicting data for the Retumbo. I guess Hodgdon isn't any more consistant these days than alot of other powder companies. "MY" particular can ran perfect with published data in my 30-378 Sako.....but powder that varies about 5-6 grains (which is my interpretation of what's going on) seems a little on the "big" side for variation.......unless we are seeing differences in freebore in makes and models of guns.
This reloading stuff can be a bit challenging....sure can't imagine doing it without a chrono!!

dancoman · #11 08-28-2006, 09:42 PM

Decided to try RL25 first. Mainly because this is the powder I shoot in my 7mmRUM. It looked to be a toss-up between H-1000, Ret. and the RL25.

Will start at 90grs. and work up. Where did yall begain to see presure signs. Want to be around 3150-3200fps MV. From reading here that is somewhere around 92grs. Is this well into the SAFE zone.
Thanks, DM

dancoman · #12 08-30-2006, 08:38 PM

What would be concidered a max load of RL25 with 200AB.
I know all rifles are differant, so I guess I'm asking a ''Ball Park'' type question here. For those that have done testing with RL25 and 200AB, where would you concider the max cutoff to be. What would be the max (safe) vel. be with RL-25 and 200 AB.
Thanks, DM

hoghound · #13 08-30-2006, 09:44 PM

I use the ex-bal program to do models on different bullets at different velocitys at my altitude and temp using the BC numbers listed and compared. I am looking for speed and thump out at 1000yds, not that I would actually shoot at game that far except at hogs [img]/ubbthreads/images/graemlins/grin.gif[/img].
Anyhow,if you get the Berger 185vld going 3400 which I did with 97gr. of H-1000 you get 1461ft/lb. If you get the 200AB at 3260 which I did with 91.5gr. of RL-25 you get 1521ft/lb. RL-25 was very consistant 3263,3267,3261. However I do not like using this powder for the extreme temp sensitivity characteristics that it has. Retumbo was to hard on primer pockets trying to get respectible velocity.
Now check this out, if you get the Berger 210vld at 3100 which is very easy to do with 91.5gr. of H-1000, or 94gr. of Retumbo you get 1530ft/lb of energy at 1000yds. I would rather stay away from RL-25 and it's quick to pressure and temp sensitivity and be healthy to shoot another day and be satisfied with a Berger 210vld at a modist velocity.
For what it's worth anyhow.
Later Tim

dancoman · #14 08-30-2006, 10:16 PM

Have had very good luck with RL-25 out of my 7mmRUM.
I would like to stay at a very modist MV with the 200AB.
Somewhere between 3150 and 3200. I loaded 8 at 91.5 and 8 at 92. Hope to get to shoot by the weekend.
I'm not looking for a super sonic round. Just a good elk hunting load.
Still would like to know where most of yall started to see presure signs with RL-25 and 200AB. Include what gun this was from. Mainlly interested in the fac. senderos.
thanks,DM