Picked up a 300RUM Sendero and need to start some loads. I have Remington cases and have received the following dies
RCBS Neck Sizer
Redding Body Die
Lee Factory Crimp
I have taken the expander ball out of the neck sizer and it sizes the outside to .332" and have outside neck turned the brass down to .0135" thick which should give a grip of .003". So now to stretch the brass I would like to try
180 gr TSX
200 gr Accubond
I can load the TSX to within .060" of the lands and still fit the magazine but the 200 gr Accubond is going to be .110" out. Seems to me the appropriate powder would be
180 gr bullets - RL22
200 gr bullets - RL25
both of which I have plenty of. I also have plenty of H1000, IMR7828SSC, H4831, IMR4350, RL19 and IMR4831, all of which are possibilities.
My Nosler #5 shows 87 gr RL22 as the max load so a possibility would be
180 gr TSX - 85 gr RL22
180 gr TSX - 86 gr RL22
180 gr TSX - 87 gr RL22
But for the 200 gr I have no listing for RL25. If I wanted to guess I would say
200 gr AB - 85 gr RL25
200 gr AB - 86 gr RL25
200 gr AB - 87 gr RL25
Should I use the IMR7828SSC instead with the 200 gr AB?
This is just stretching the first 25 cases but I would like to start at a meaningful powder charge but still be well within safety ranges. What I'm looking for is someone who has gone through the development stages as well.
Good to go?
If you can read this, thank a teacher.......if you are reading this in English, thank a soldier.
My factory sendero liked 87 grains of rl-25 with the 208 amax 84 or 85 grains to start out should be very safe my other load with the broughton barell is 88 grains of h-1000 210 berger it loves this one 3 shot group @ 100yrds you can cover it with a dime I NEVER RAN THEM THROUGH A CHRONY MY OAL WAS 3.060 ON BOTH LOADS
If you search for the RUM loads here and othe places you will hit some interesting info.
Retumbo seem to be the go to powder. However, seems that guys are finding the load to be from 91 to 96 gr Retumbo and some are pressuring out at 91-92 gr so be careful. MV is widely varying but topping out at 3250, and not related to the high end loads. that is with the 200 gr Accubond.
Some are having good luck with RL25 and MRP2. Have not seen any with RL22
Mag primers are normally used. either the Fed 215. Rem or wolf