300 Win Mag / RL26

lhedrick1

Well-Known Member
Joined
Nov 2, 2020
Messages
89
Location
Ohio
Looking for some starting load data for the above. I just got a box of 220gr ELD-X and haven't loaded with RL26 yet. Alliant only gives one charge at 74.2 +/- for this bullet weight.

Anyone have any experience with this combo?
 

Coyoteee

Member
Joined
Oct 3, 2020
Messages
10
Location
Lacombe
A word of caution with RL26. It won’t show pressure signs in the conventional way. I was trying it in a 257Wby. Couldn’t find any data anywhere. At 72.6gr all was normal, at 72.8 a slight bruise, at 73 i had to use a hammer to open the bolt. I didn’t see the bruise at 72.8 until after I fired the 73. No harm done, except for those two brass that were severely stretched. Thanks to the MarkV action. Found out later that Quick Load specs that cartridge/powder/bullet combo at under 71.0 max. Had phenomenal speed, 3636fps with the 72.6gr and 117grBTSP fr Hornady. Accuracy was terrible all the way up between 1.5-2” So make sure you have data from a reputable source, or go up very very slowly, and watch very very carefully
 

ThrdKllr

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Joined
Jul 18, 2019
Messages
229
Location
La
A word of caution with RL26. It won’t show pressure signs in the conventional way. I was trying it in a 257Wby. Couldn’t find any data anywhere. At 72.6gr all was normal, at 72.8 a slight bruise, at 73 i had to use a hammer to open the bolt. I didn’t see the bruise at 72.8 until after I fired the 73. No harm done, except for those two brass that were severely stretched. Thanks to the MarkV action. Found out later that Quick Load specs that cartridge/powder/bullet combo at under 71.0 max. Had phenomenal speed, 3636fps with the 72.6gr and 117grBTSP fr Hornady. Accuracy was terrible all the way up between 1.5-2” So make sure you have data from a reputable source, or go up very very slowly, and watch very very carefully
I noticed the exact same experience in my Creedmoor. Going up .3 grns and velocity was increasing 10-20 fps to a point and the next .3 grns jumped 90 fps and primer pockets got loose.
 

Calvin45

Well-Known Member
Joined
Apr 13, 2019
Messages
932
Location
Nipawin, Saskatchewan, Canada
A word of caution with RL26. It won’t show pressure signs in the conventional way. I was trying it in a 257Wby. Couldn’t find any data anywhere. At 72.6gr all was normal, at 72.8 a slight bruise, at 73 i had to use a hammer to open the bolt. I didn’t see the bruise at 72.8 until after I fired the 73. No harm done, except for those two brass that were severely stretched. Thanks to the MarkV action. Found out later that Quick Load specs that cartridge/powder/bullet combo at under 71.0 max. Had phenomenal speed, 3636fps with the 72.6gr and 117grBTSP fr Hornady. Accuracy was terrible all the way up between 1.5-2” So make sure you have data from a reputable source, or go up very very slowly, and watch very very carefully
Imr enduron 4955 did this very same
Thing to me. None of the other enduron powders have been trouble
 

Sevy

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Joined
Apr 18, 2016
Messages
287
Location
Oregon
Alliant gives you the max load. Reduce by 10% for a starting load. I have had great luck with rl26 and the 225’s and the 208’s. Great groups and great speeds. Never had any pressure spikes.
 

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Double Dropper

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Joined
Nov 2, 2015
Messages
303
Location
Beaver County, Alberta
Imr enduron 4955 did this very same
Thing to me. None of the other enduron powders have been trouble
I have yet to exceed book loads, and funny some of the best accuracy has been around max recommended loading, not over max. I use ADG brass and most of the time I can get to the maximum recommended load recommendations but......with the ADG brass and the lower internal volume you end up losing with stretched primer pockets.
 

lhedrick1

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Joined
Nov 2, 2020
Messages
89
Location
Ohio
I did a work up starting at 72 grains of RL26 and 220 gr ELD X about 15 thou off the lands. Accuracy was horrible until I got to 74 grains. But I also blew two primers and had a heavy bolt lift on the last shot with that load.

Think Ill back it down to 73 gr and try giving her some more jump and see what happens. Was too crappy to haul the Magnetospeed out so I have no idea what sort of velocity I was getting.
 

Steves1911

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Joined
Feb 1, 2020
Messages
97
Location
Hedgesville, WV
I have used rl26 with the 300win and 200gr eldx. 75grs is where I settled on that load with peterson brass which is a little heavy. I just recently got 2 boxes of the 220gr eldx and am debating on trying rl26 or retumbo.
 

lhedrick1

Well-Known Member
Joined
Nov 2, 2020
Messages
89
Location
Ohio
I finally shot a good group with the RL26/220gr ELD X. Was 73 gr of RL26 and CBTO of 3.850. Put 3 in about 3/4" and 1 flyer about 2" away @ 200 yards. Magnetospeed averaged 2865 fps. Zero pressure signs.

Need to try again and see if its consistent.
 

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