MRP for 300 rum??

[älg]

does anyone have loads for a 300 rum using norma mrp?

how would it work for 200-220-240 bullets with a 10 twist / 26 " barrel?
thanks in advance.

 

[royinidaho]

Should be pretty much the same or very close to RL-22.

 

[hoghound]

ALG, Here is a powder burn rate chart:
http://home.hiwaay.net/~stargate/powder/powder.htm

Here are some loads that shoot ragged holes at 300yds in my stock 300Rum Sendaro:

220gr Sierra - 91.2grs. of Retumbo @ 3000fps
210 Berger VLD - 91.5grs. of H-1000 @ 3020fps.
210 Berger VLD - 94grs. of Retumbo @ 3100fps.
(My favorite) Berger 185 VLD - 97grs. of H-1000 @ 3400fps.

All lite with Fed. 215

Tim

 

[BountyHunter]

IF you have access to some MRP, suggest you look at the MRP2 which is equivalent to RL25. MRP2 works great in the 338 AI versions I know.

Black Hills is now the only distributor of Norma powders in the US and no direct sales to individuals, so your dealer will have to order.

MRP/MRP2 are extremely reliable lot to lot especially compared to the RL22/25 and not as temp sensitive.

BH

 

[biff's reloading]

Bringing an old thread back to life but I wonder if anyone else has any more info. I have a can of mrp that I have no info for. If I can't find retumbo, I'd like to have a use for it. Thanks

 

[Varberger757]

Found some data both in LRH, I hope it will help you. Originally by a member called bh5k in 2011. I left only data for Normas powder related to the 210gr VLD

Bullet Powder Start Load Approximate Start Velocity Max Load Approximate Max Velocity Fill Ratio

210 Grain NORMA MRP 2 80.0 2663 88.2 2961 95.6%

210 Grain NORMA MRP 75.0 2647 83.3 2894 86.8%

Here something relevant from Sweden:

Laddata also in English!

gun)

 

[TJAY]

Here is Norma data.

300 Remington Ultra Magnum - Norma